ADR244A

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ASHIDA ELECTRONICS PVT LTD. ASHIDA HOUSE, Plot No. A-308, Road No. 21, Wagle Industrial Estate,Thane (W)-400 604. INDIA. E-mail: [email protected] Web: www.ashidaelectronics.com

Note: Due to our po l icy to upgrade our products constant ly , we reserve the r ight to supply products which may vary s l ight ly f rom that ind icated above.

Type: ADR244A(ADITYA–V2 Ser ies )

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ASHIDA Numerical Motor Protection Relay

Protection Features:

Start-up Time Supervision.

Thermal Overload Protection.

Stall Detection Element.

Start Number Protection.

Over-Current Protection including Doubling feature.

Selection of Curve: Five selectable IEC curve (Normal Inverse1 (C1), Normal Inverse2, (C2) Very

inverse (C3), Extremely inverse (C4), Long time inverse (C5)) and Define Time (C6)

Five selectable IEEE / ANSI Curve C7 to C11 and C12 RI curve & C13 RXIDG curve.

Earth Fault Protection (Internally derived 3Io & Externally EF).

Current Unbalance Protection.

Negative Phase Sequence element including Phase reversal.

Under Voltage Protection.

Over Voltage Protection.

Residual O/V (NDV) Protection.

Under Current Protection.

Active Under Power Protection.

Active Over Power Protection.

Power Factor Protection.

Reverse Power Protection.

Under/Over Frequency Protection.

3 Phase Voltage Check.

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Breaker Failure Detection.

I/O and AND Eq. Configuration.

In-built CB Trip Circuit Supervision function during pre closing and post closing of CB.

On site CT Secondary selection 1A or 5A.

Relay Design Features:

Large 20x4 LCD display for Parameter and setting display.

Disturbance Recorder. Up to 3sec of actual waveform of current & voltage along with logical and

physical status are captured & saved in the built-in memory with date time stamping, for analyzing

fault condition & fault location.

Fully communicable with IEC standard open protocol. 60870-5-103.

Separate Communication Port for SCADA (RS485) as well as Local testing (RS232C).

Online display of CB status and other digital and logical status.

Continuous monitoring of module’s internal hardware and alarm generation in case of failure of any

critical components.

10 Programmable Digital Output contacts.

8 Optically isolated digital status input for monitoring of status and avoid use of external relay logic.

2 dedicated status input for Trip Circuit Monitoring

100 nos. of event memory, event such CB close, Trip, digital status change, relay pkp etc. All events

are with date and time stamped up to 1ms.

10 nos. of Fault data stored with keypad interface and time stamping.

Display of Voltage, current, PF, Active, and Reactive Power in terms of primary and secondary value.

Main Functions The ADR244A Relay is having following protection functions. 1. Start up Time Supervision.

2. Thermal Overload Protection.

3. Stall Detection element.

4. Start Number Element.

5. 3 stage of Over current element. (IP>, IP>> and IP>>>) with doubling features.

6. 3 stages of Earth Fault element (Internally derived 3Io & Externally EF)

7. Current Unbalance Protection

8. 2 stage of Negative Phase sequence over current with phase reversal.

9. 2 stage of Under voltage element.

10. 2 stage of Over voltage element.

11. 2 stage Residual O/V Protection.

12. 2 stage of Under Current Protection.

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13. 2 stage of Active Under power element.

14. 2 stage of Active Over power element.

15. Power Factor Protection.

16. Reverse Power Protection.

17. Under / Over Frequency Protection.

18. 3 Phase voltage check.

19. Trip Circuit Supervision.

20. Breaker Failure Detection.

21. I/O and AND Logic Eq. configuration.

22. Monitoring Functions.

Each of these functions is independently programmable and can be enable or disable by user depending

upon requirement.

1. Start-up Time Supervision:

Starting time supervision protects the motor against unwanted prolonged starts that might occur

in the event of excessive load torque or excessive voltage drops within the motor, or if the rotor is

locked. Rotor temperature is calculated from measured stator current. This function is activated

as soon as the ADR244A relay detects a start by T1 status from the breaker or start by current.

The movement current cross 1.5xIFLA of setting, relay will start timer and start calculating delay

by following formula:

Delay = (Istartup / I)2 * Tstartup

and after this time delay relay will provide trip command. Where

I = Maximum phase current value

I startup = Motor Startup current value setting 1 to 5xIFLA

Tstartup = Motor Startup time delay setting 1 to 180 Sec

The value applied on Tstartup is dependent on the state of the motor, cold or warm. This warm or

cold state of the motor is determined by the thermal model of the rotor. Because the flow of

current is the cause of the heating of the motor windings, this equation will accurately calculate

the starting supervision time. The accuracy will not be affected by reduced terminal voltage that

could cause a prolonged start. The trip time is an inverse current dependant characteristic (I²t).

Any of the output element from RL1 to RL10 can be assign to this function.

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2. Thermal Overload Element:

In ADR244A relay models, this function is used to measure the temperature or thermal state of

the motor winding. The thermal overload protection can be selectively enabled or disabled. The

RMS and negative sequence components of the load current are measured independently and

are combined together to form an equivalent current Ieq The heating effect in the thermal replica

is produced by Ieq² and therefore takes into account the heating effect due to both RMS and

negative sequence components of current.( I2)

The equivalent motor heating current is calculated by:

Ieq = √(Irms²+ K I2²)

Irms : root mean square current(max value of three phase current)

I2 : negative sequence current

K is a constant proportional to the thermal capacity of the motor set 0 to 10.

The equivalent motor heating current is calculated every 20ms for a 50Hz system. The maximum

value recorded will then be utilized by the thermal algorithm.

Starting from this equivalent thermal current, the thermal state of the motor θ is calculated

according to the following formula:

Θi+1 = (Ieq /IΘ )² · [1 – exp (t/T)] + Θi · exp (-t/T)

Iθ > is the thermal overload current threshold.

θi is the value of the thermal state calculated above (1 cycle before, ie. 20ms in a 50Hz system).

It is the iteration cycle time (20 ms for a 50 Hz system, 16,67 ms for a 60 Hz system).

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The cooling time constant Τr which is applied when the motor is shut down. In this case, the

motor no longer consumes current and the value of the thermal state θ therefore decreases as

time passes according to the formula:

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The equation used to calculate the trip time at 100% of thermal state is:

t = τ ln ((k²- A)/(k²-1)) A multiple time constant is used, in order to take into account the different sequences of the motor

overload, starting or cooling conditions.

Where the value of τ (thermal time constant) depends on the current value absorbed by the

motor:

τ = T1 if IFLA < Ieq< = 2* IFLA overload time constant

τ = T2 if Ieq> 2* IFLA start-up time constant

τ = Tr if interrupting device opened cooling time constant

IFLA = thermal full load current setting

k = Ieq / IFLA = measured thermal load (or thermal capacity)

A = initial state of the machine, in percentage of the thermal state

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The initial state of the machine is included in the formula, so that the operating time for a thermal

trip will be decreased in case of a hot motor start. During the starting of motors which have

extreme starting conditions, such as very long start times or very high start current values an

inhibition of the thermal curve during start-up is provided, in order to avoid false trips. If the

calculated thermal state reaches 90% before the end of the starting period, this value is retained

at 90% for the remaining period of the « Prol. Start Time ». At the end of the starting period the

inhibit is removed. The trip signal is reset if Thermal state is less than set pick-up value.

Thermal alarm function: θ ALARM

The purpose of this function is to produce an alarm signal indicating that the thermal state θ of the

motor has exceeded θ ALARM setting 20% to 100%. Corrective action can thus be taken before

thermal tripping occurs.

The equation used to calculate the time to the thermal alarm is:

talarm = τ ln(k²/(k²–Thermal Alarm /100))

θ FORBID. START:

This function makes it possible to block a start on a hot motor, a further start is inhibited for the

motor as long as its thermal state θ is higher than an adjustable threshold θ FORBID START. It is

then necessary to wait until the motor cools down. When the value of the thermal state θ falls

below the threshold θ FORBID START, the starting of the motor is authorized. θ FORBID START

information is activated if Motor shut down and Thermal state value θ higher

than the threshold θ FORBID START setting 20% to 100%.

Any of the output elements from RL1 to RL10 can be assigned to this function.

3. Stall Detection Element:

The Prolong Start function protects the motor against excessive start-up over current. To this

effect, it uses a start-up current threshold Istart setting 1 to 5x IFLA, and a start-up time-delay

tIstart. This threshold and this time delay can be adjusted to allow the starting current to pass.

This function is activated (time delay tIstart initiated) as soon as the ADR 244A relay detects a

start (the criterion for detection of a start by T1 status from the breaker or start by current).

Start Detection Criteria: 1) 52A : T1 (CBNO) status input is monitored.

2) VI Start: If all Phase current is greater than 5% of IFLA or all 3 phase voltage is greater than

set 3 phase voltage check then it is VI start condition .

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It is deactivated on expiry of the starting current time delay tIstart. If, on expiry of the time delay

tIstart, the current consumed by the motor has not fallen below the threshold Istart>, a prolonged

start signal “Prolong start t Istart” will be generated.

Locked rotor at start:

This function, which makes it possible to detect that the motor is locked at the start, is activated

only during the starting phase that is during the course of the starting time delay tIstart. It uses a

motor speed indication received via a logic input of the ADR244A relay set on SPEED SW and

the tIstall time-delay locked rotor time (a speed switch device must be connected to this logic

input”). On detection of a start, the "locked rotor at start" function is activated the time delay tIstall

begins. At the end of this time delay, the logic input set on SPEED SW must be in logic state 1 to

indicate that the motor speed is not zero. The opposite case (zero speed) means that the rotor is

locked, so the ADR244A relay generates a trip signal of locked rotor at start order LOCKED

ROTOR.

Motor Startup

detection

Speed Switch Open

Internal Logic

Signals&

Trip Logic Circuit of Locked Rotor at Start

Motor Startup

detection

Speed Switch Open

Internal Logic

Signals&

tI stall 0

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Stall Detection:

This function, which makes it possible to detect stalling while the motor is running, is activated

immediately after the starting period, that is on expiry of the starting time delay tIstart two

parameters can be set: the stalled rotor current threshold Istall setting 1 to 5xIFLA, with its

associated time delay tIstall, the stalled rotor time. The ADR 244A relay detects the over current

caused by stalling and generates information that the rotor has stalled while the motor is running

if the phase current exceeds the threshold Istall for a length of time greater than tIstall. The trip

signal is reset if measured current is less than set pick-up value or motor is stop. Any of the

output element from RL1 to RL10 can be assign to this function.

Re-acceleration after a reduction in system voltage:

A fall in voltage from the electrical network causes a reduction in rotor speed. When the voltage is

restored, the rotor starts on a re-acceleration phase in order to regain its nominal speed.

The stall protection will be disabled, to allow for re-acceleration, if a low voltage condition exists

on the system for a time in excess of 10 sec and if, upon recovery of the Reac Low V set 10V to

60V, the current exceeds the stalling current threshold within 5 seconds If the current fails to fall

below the stalling current threshold before the end of the ‘Prol.Start Time’, the relay will generate

a tripping order If the current exceeds the stalling current threshold after the 5sec window used

for reacceleration criteria, the stall protection will be enabled and a trip will occur. This function is

disabled during the starting period.

4. Start Number Element:

Repeated starting, or intermittent operation of a motor, may generate dangerously high

temperatures within the motor, unless sufficient time is allowed for cooling between starts. The

ADR244A relay incorporates a number of starts limitation facilities. This limitation is fully

programmable and is applicable to both hot and cold start conditions. A hot start is defined if

thermal state greater than the set value and a cold start is defined as a thermal state lower than

set value.

Starts are detected using the T1 status from the breaker or start by current. Once the number of

starts equals the user defined setting, the start inhibit is enabled for the inhibit time set period.

Example 1: Let two maximum number of cold starts is selected and both is completed within the

set ‘Time betw.2 cold start’ has been reached, therefore, the ‘Inhib. Start Time’ is initiated. The

remaining time ‘Time betw.2 cold start - tn’ is greater than the ‘Inhib. Start Time’, so the start

inhibition remains for a duration equal to ‘Time betw.2 cold start – tn’.

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Example 2 : The maximum number of starts within the ‘Time betw.2 cold start’ has been reached, therefore, the ‘Inhib. Start Time’ is initiated. The remaining time ‘Time betw.2 cold start – tn’ is shorter than the ‘Inhib. Start Time’, so the start inhibition remains for a duration equal to ‘Inhib. Start Time’.

Motor Start

ON

OFF

ON

OFF

Start inhibition example 1

Start Inhibition

tn = 8 min InhibitionStart time= 10 min

tn= 20 – 8 = 12 min

Time b/w 2 start=20 min

Time b/w 2 start=20 min

Motor Start

ON

OFF

ON

OFF

Start inhibition example 2

Start Inhibition

tn = 35 min InhibitionStart Time = 10 min

Time b/w 2 start = 40 min

tn = 5min

Time b/w 2 start = 40 min

Time b/w 2 start -

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Anti-Backspin protection: The ABS (anti-backspin) function imposed a waiting time between a stop and a re-start of the

motor. This waiting time makes it possible to stop rotating before the motor is re-started. It is

based on the use of an adjustable time delay: tABS. This time-delay is initiated when a motor stop

is detected. As long as this timer is running, an ABS alarm indication issued. This ABS indication

disappears at the end of the tABS time-delay

Fig. Anti-Backspin

5. Over Current Element:

Over current faults also referred to as short circuits, can cause motor failures and fires. Over

currents can be caused by phase-to-phase and phase-to-ground-to-phase faults. A short circuit

results in a sudden surge of current which can reach several hundred times the working current

within milliseconds which increase the temperature of rotor winding and damage the motor.

The relay has three independent stages of over current (IP>, IP>>, & IP>>>) element. The setting

range of IP> and IP>> is 10% to 250% with selectable IDMT / DT time delay and setting range of

IP>>> is 50% to 3000% with Instantaneous / DT time delay.

For phase the output of 1st stage (IP>) is separate and not connected to trip contact.

The output of all stages can be assigned to any of 10 programmable relay through key board.

While output of 2nd and 3rd stage is connected to trip element. Thus 1st stage can be used as

ALARM before TRIP or can be used to TRIP another CB before tripping main CB.

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Trip Logic Circuit of OC Element:

Although the curves tend towards infinite when the current approaches In (general threshold), the

minimum guaranteed value of the operating current for all the curves with the inverse time

characteristic is 1.1In (with a tolerance of ± 0.05In).

Doubling feature: If doubling feature is enabled and motor start is detected then Ip>>> setting will be doubled for

duration of Tsafe.

6. Earth Fault Element:

As the stator windings are completely enclosed in grounded metal, the fault would very quickly

involve earth, the presence of the surrounding metallic frame that rapidly develops current to flow

through the earth winding increases the motor temperature which may damage the insulation of

the motor winding so that the motor will fail.

In ADR244A use standard star connection at relay side and internally reconstruct phase to phase

voltage required for direction detection. Similarly relay calculates open delta voltage (3Vo) and EF

current (3Io) required for detection of EF element. The relay has two different type of Earth Fault one is marked as 3Io and another is marked as IE.

The 3Io is derived internally by software through phase current while IE is measured from

external CT. Thus IE can be used as Core Balance CT (CBCT).

The relay has three independent stages of Internal Earth Fault current (3Io>, 3Io>>, & 3Io>>>)

element. The setting range of 3Io> and 3Io>> is 10% to 100% with selectable IDMT / DT time

delay and setting range of 3Io>>> is 50% to 1200% with Instantaneous / DT time delay.

The relay has three independent stages of Earth Fault current (IE>, IE>>, & IE>>>) element. The

setting range of IE> and IE>> is 10% to 100% with selectable IDMT / DT time delay and setting

range of IE>>> is 50% to 1200% with Instantaneous / DT time delay

The output of all stages can be assigned to any of 10 programmable relay through key board.

While output of 2nd and 3rd stage is connected to trip element. Thus 1st stage can be used as

ALARM before TRIP or can be used to TRIP another CB before tripping main CB.

I>

Internal Logic Signal

IP>

IP>>>

IA IB IC

DT/IDMT

DT

IP>>

DT/IDMT

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Trip Logic Circuit of Earth fault Element:

Trip Logic Circuit of internally derived Earth fault Element:

The separate output contact allows to use each stage for independent function such as stage 1

can be used for ALARM stage 2 for tripping or both can be use for tripping independent CB. Each

stage can enable or disable depend upon application.

7. Current Unbalance Protection:

Current Unbalance function, which protects the motor against unbalance conditions, broken

conductor and phase inversions, is based on the measurement of the delta I current which is

given by

When the average current, Iav, is greater than the motor-rated full load current, the relay

calculates the percent imbalance:

IUB% = (Imax – Iavg) * 100% Iavg

When the average current is less than motor-rated full load current, the relay calculates percent unbalance:

IUB% = (Imax – Iavg) * 100% IFLA

current, Iavg is average value of three phases = (IA+IB+IC)/3

If the calculated IUB% current is more than the set Iu>> then relay will generates a trip signal due

to unbalance after a time delay calculated by set DT delay.

3Io


3Io>

3Io>>>

IA IB IC

DT/IDMT

DT

3Io>>

DT/IDMT

IE


IE>

IE>>>

DT/IDMT

DT

IE>>

DT/IDMT

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8. Negative sequence over current:

Negative sequence over current takes place due to:

(1) Magnitude differences between the three-phase currents,

(2) The presence of phase unbalance.

Even small current unbalance can lead to large negative sequence currents because of the small

negative sequence reactance.Which produce a reverse field in motors which drives the rotor at

twice the frequency so eddy currents are induced on the surface of the rotor, leading to

temperature rise in the rotor and damage the winding of motor.

The ADR244A include negative phase sequence over current element which protects the motor

against unbalance conditions, broken conductor and phase reversal is based on the

measurement of the negative sequence component of the current. Two stage of negative

sequence over current thresholds are available. The setting range of I2>> is 10% to 150% with

selectable IDMT / DT time delay and setting range of I2>>> is 50% to 1500% with DT time delay.

For 2nd stage (I2>>) all major international IDMT curves are available and C6 curve is used for

DT Time.For 3rd stage (I2>>>) is used for definite time DT.

Trip Logic Circuit of NPS Element

The C14 is I2 t Characteristic

t = C14_const / (I22 )

Where is C14_const is programmable from 0.02 to 40

The C15 is define as

t = (Time dial) / (I22 – (I2>>)2 )

Further The Tmin time is programmable i.e If calculated IDMT time delay is less than this setting

relay will follows Tmin timing.

Trip signal is reset if measured NPS current is less than set pick-up value.Two stages are

included to provide both alarm and trip stages, where required. Any of the output elements from

RL1 to RL10 can be assign to this function. The output can be use for alarm or tripping of CB.

I negative


I2>>

I2>>>

IA IB IC

DT/IDMT

DT

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Phase Reversal:

The phase reversal protection is based on the calculated negative phase sequence current and

detects too high NPS current values during motor start up, caused by incorrectly connected

phases, which in turn will cause the motor to rotate in the opposite direction.

When the calculated NPS current value exceeds 75% of the maximum phase current value,

the phase reversal element will generates a trip signal after a fixed 200ms operate time.

The element will be reset in 200ms after the calculated NPS current value has fallen below 75%

of the maximum phase current value.

The NPS or unbalance element will be blocked during the tripping of the phase reversal

element.

9. Under Voltage Element:

Under voltage conditions may occur on a power system as a result of increased loading, fault

conditions or incorrect regulation, when the voltage is going to reduce at permissible limit then

current is increase (KVA rating of the motor is constant) that increases the motor temperature

which may damage the insulation of the motor winding or motor will stall when subjected to

prolonged under voltage condition.

This function is only enabled when the circuit breaker is closed, therefore it requires a CB

auxiliary contact T1 mapped to an opto input to monitor the breaker status and deactivated during

the motor start-up stage (i.e. If "INHIB V<" set to "YES" by the user). If INHIB V< is set NO and

the measured voltage of any phase is less than set voltage V<, V<< relay will generates a trip

signal after set IDMT / DT time delay.

The under voltage protection included within the ADR244A relays consists of two independent

stages.The relay has two stages of Under Voltage (V<, V<<) element. The setting range of V<

and V<< is 15V to 60V L- N with IDMT / DT time delay

Two stages are included to provide both alarm and trip stages, where required. Any of the output

elements from RL1 to RL10 can be assign to this function. The output can be use for alarm or

tripping of CB.

V<


V<

V<<

VA VB VC

DT/IDMT

DT

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The IDMT characteristic available on the first stage is defined by the following formula:

t = K / (1-M) Where:

K = Time multiplier setting

t = Operating time in seconds

M = Measured voltage/relay setting voltage

10. Over voltage element:

Over voltage takes place due to sudden loss of load and transient surges on the network. This

function, which makes it possible to detect a voltage increase, uses a phase-phase over voltage

protection with a definite time characteristic because as voltage is increases torque is increases

(T∞ square of V ) so the current consumption increases as well leading to increase in motor temp.

with every increase in current. A long period of increased current consumption may damage the

insulation of the winding.

The Over voltage protection included within the ADR244A relays consists of two independent

stages.The relay has two stages of Over Voltage (V>, V>>) element. The setting range of V> and

V>> is 50V to 100V L- N with IDMT / DT time delay.


t = K / (M - 1) Where:

K = Time multiplier setting

t = Operating time in seconds

M = Measured voltage/relay setting voltage

Two independent measuring elements are available for over voltage protection to measure

phase-phase voltages. if the measured voltage is remains above the set over voltage threshold

value V the timer will start after the pickup and relay will generates a trip signal after a set IDMT /

DT time delay is over, otherwise it will operate normally .

V>


V>

V>>

VA VB VC

DT/IDMT

DT

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The trip signal is reset if measured voltage is less than set pick-up voltage. 1st stage is used for

alarm only and 2nd stage is used for alarm and trip signal. These elements are followed by an

independently selectable IDMT time delay. Any of the output elements from RL1 to RL10 can be

assign to this function. The output can be use for alarm or tripping of CB.

11. Residual O/V Protection:-

Residual over voltage protection is available for stator earth fault protection where there is an

isolated or high impedance earth fault occurs on the primary system, this balance is upset and a

'residual' voltage is produced. The residual voltage can be measured from a residual voltage input

at the secondary terminals of a voltage transformer having a "broken delta" secondary connection

or can be calculated from the three phase to neutral voltage 3Vo measurements. The Setting is

from 5V to 50V. Two independent stage (VN>,VN>>) of protection are provided for each

measured neutral voltage input and also for the calculated value, 1st Stage can be selected as

either Inverse Definite Minimum Time (IDMT) or Definite Time (DT). 2nd Stage can be selected as

Definite Time (DT) only.


t = TMS / (1 - M)

Where;

TMS = Time Multiplier Setting

t = Operating Time in Seconds

M = Derived Residual Voltage / Relay Setting Voltage.

The relay will generate trip a signal after set IDMT / DT time delay when the measured Residual

O/V is above the set VN> or VN>> value. Any of the output elements from RL1 to RL10 can be

assign to this function.

Trip Logic Circuit of Residual O/V Element:

3Vo


VN>

VN>>

VA VB VC

DT/IDMT

DT

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12. Under Current Element:

The Under current function which makes it possible to detect a loss of load, for example protect a

pump against becoming unprimed or to stop a motor in case of a mechanical transmission (e.g.

conveyor belt or very low load), or it can be used with synchronous motors to protect against loss

of supply condition which increases in starting time and overheating the motor.

The relay has two stages of Under current (I<, I<<) element. The setting range of I< and I<< is

10% to 100% with DT time delay

Under current is associated with the inhibit start time delay Tinhib. This function is deactivated

when the motor is shut down (logic input T1 in the 0 state) and also during the start up relay

inhibit tripping in under current function, this function is activated at the end of the inhibit time

delay. The time delay Tinhib is useful for motors with no-load starting which take on load

gradually at the end of starting. When the motor is running then after expiry of the inhibit time

delay, if the value of one of the phase currents consumed by the motor is lower than the under

current threshold value for a period greater than or equal to set DT, the relay will generate a

under current signal.

Trip signal is reset if measured current is more than set under current value or motor is shut

down 1st stage is used for alarm indication and 2nd stage is used to provide both alarm and trip,

where required. Any of the output elements from RL1 to RL10 can be assign to this function. The

output can be use for alarm or tripping of CB.

>=I

Motor Startup

Detection

Internal Logic

information's &

I <

Trip Logic Circuit of Under Current Element

Motor Shutdown

(T2=0)

I A

I B

I C

tI stall 0

tI< 0

>=I

Motor Startup

Detection

Internal Logic

information's &

I <

Trip Logic Circuit of Under Current Element

Motor Shutdown

(T2=0)

I A

I B

I C

tI stall 0

tI< 0

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13. Active Under/Over Power Element:

The Loss of Load protection within the ADR244A relay uses 2 stages under power elements to

detect a loss of load due to a shaft failure or a pump running unprimed. Both stages are

selectable to Definite Time (DT). This feature is only enabled when the motor start is detected.

Three phase active power is calculated as:

If the minimum 3 phase active power is less than the programmed P< or P<< setting (1W to 120

W) threshold value then after pickup timer will start, a trip will be initiated at the completion of a

settable time delay plus drop-off time delay and remains in trip until the CB contact T1 is zero or

the 3ø active power is more than set value.1st stage is used for alarm indication and 2nd stage is

used for alarm as well as trip signal.

Trip Logic Circuit of under Power Protection Element:

Same way if three phase active power is greater than set over power P>, P>> (setting 50W to

250W) relay will generates a alarm or trip signal. Since rated power cannot be reached during

starting, this feature can be disabled using a delay on drop off time during the motor start time.

Trip Logic Circuit of Over Power Protection Element:

3ø Active Power


P>

P>> DT(tP>>

DT(tP>)

3ø Active Power


P<

P<< DT(tP<<

DT(tP<)

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A low forward power condition can only be established when the circuit breaker is closed and the

active power calculated is above zero.1st stage of under and over power is used for alarm

purpose only and 2nd stage used for trip signal, Any of the output element from RL1 to RL10 can

be assign to this function.

14. Power Factor Element:

Power factor protection will be provided for out-of-step protection on synchronous machines. The

3ph power factor is taken into account: a drop-off time during the motor start time can be used, in

order to avoid tripping orders during starts. This feature is only enabled when the circuit breaker

is closed, therefore it requires status T1 of circuit breaker auxiliary contact mapped to an opto

input to get the information CB closed / CB open.

This feature can be inhibited during starting by selecting an appropriate Tinhib time delay.

The relay will generate trip a signal after set time delay when the measured Power factor is

greater than set P Lead or P Lag value.

15. Reverse Power:

When a power supply failure occurs on the feeder, synchronous motors will become generators

due to the inertia of their load and the induction motors will start to work as generators. The aim of

the reverse power protection is to detect the inverse flow of Power and to avoid that the motor

feeds the fault which has appeared on the network.

Reverse power protection is used to detect loss of the prime mover. A reverse active power

element provides anti-motoring protection. The reverse power element may be set as low as 2%

of the generator rated power.

The relay will generate trip a signal after set time delay when the measured reverse Power is

greater than set RP> value.

16. Under / Over Frequency Element:

This feature is required to protect synchronous machines against loss of AC, because, in this

case, a loaded motor will decelerate fairly quickly on loss of supply and the frequency of the

terminal voltage will fall. Two independent measuring elements, followed by a definite time delay,

are available for under frequency protection.

This function is disabled in the following conditions.

− during start-up (during the “Prol. Start Time” timer),

− when the motor is stopped (“Interrupting device open”),

− If the frequency cannot be determined (for example, if there is no analogue input connected to

the relay).

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The relay will generate trip a signal after set time delay when the measured frequency is above

or below the set F>, F< value.

17. 3 Phase Voltage check :

Checking of the phase voltages before the start of the motor. This function makes it possible to

check that the system voltage level is sufficient to allow a satisfactory motor start sequence. It is

only valid when the relay "sees" the motor is stopped. With the motor stopped, the ADR244A

relay issues a "Low V" alarm indication if the measured voltage (between any phases A, B and C)

is below a settable threshold, "Start Low V Set "10V to 60 V. For a good starting condition, the

positive sequence voltage (V1) should be greater than the negative sequence voltage (V2) and

the phase voltages VA and VB and VC should be greater than the user settable threshold Start

Low V Set.The result of this function may be used into the programmable scheme logic in order to

inhibit the start of the motor if the voltage is not sufficient.

18. Trip circuit Supervision:- The ADR244A is having 2 separate digital opto-coupler status input which can be used to

continuously monitor continuity of trip-circuit. The general scheme is as shown in fig

Relay monitor Trip coil continuity through CB NO during close condition and through CB NC

during Trip condition. If any discontinuity observed it generate Alarm signal.

The output marked as PROTH (Protection healthy) is normally is ON and become OFF at

following condition

When DC supply is not sufficient (DC fail) When T1 and T2 both active and both inactive i.e. CB NO as well as CB NC are both

close or open. Relay detects any internal hard ware Error.

VA VB VC

Motor Shut down

Internal Logic

information's &

3 Ph V Chk

Trip Logic Circuit of 3 Phase Voltage

VA VB VC

Internal Logic

Information’s &

Trip Logic Circuit of 3 Phase Voltage

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19. Breaker Failure Detection:-

The breaker failure function is used to quickly detect that a circuit-breaker has not opened (phase

fault currents still present) after a trip signal. This function is based on a "I<BF" current threshold

setting 10% to 100% and on a "tBF" time-delay; these two settings can be configured by the user

in General Settings Menu. Normally after tripping, current should become Zero within 100 –

200ms time depending upon type of fault and breaker mechanism. After Fault ADR244A trigger

internal timer (settable from 100 ms to 1000 ms) if fault is not cleared during this time then relay

declare as Breaker fail (LBB function) and change another contacts. This contact is marked as

Breaker Fail can be used to trip back up breaker or can be used to generate ALARM signal.

20. I/O and AND Eq. Configuration: AND LOGIC EQUAT allows the operator to programme four AND logic equations. Each equation

can be the logic AND link of signals from internal functions or from external binary input signals.

In this submenu, the operator sets the parameter cells of each of the 4 AND logic equations by

assigning individual signals to the individual AND logic equations. An operating timer stage and a

reset timer stage are assigned to each AND logic equation. These eight independent timer stages

can be set in the submenu AND LOGIC EQUAT T DELAY.

The operating timer stage Toperat is initiated only if all the associated data in the logic equation

are in logic state 1 (AND gate). It allows the logic equation validation to be delayed for a time

period set in Toperat. The reset timer stage Treset is initiated as soon as any of the data

associated with the equation disappears i.e. goes to logic state 0. It allows the logic equation to

remain valid for a time period set in Treset.

21. Monitoring Functions (Event, Disturbance Record):-

Apart from basic protection functions relay is continuously monitors all Motor operation through

status, its internal functions, internal hardware etc. If any change is observed, it is marked as

event. Such types of events are stored in internal non-volatile memory along with time stamp.

1

62

B+

B-

TC

CB NO

CB NC

Fig.4 Trip Circuit Logic

1

62

To Relay CPU

To Relay CPU

TCCOM

T1

T2

1

62

B+

B-

TC

CB NO

CB NC


1

62

To Relay CPU

To Relay CPU1

62

B+

B-

TC

CB NO

CB NC


1

62

To Relay CPU

To Relay CPU

TCCOM

T1

T2

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Following are some of the events. Relay PKP, Relay Reset, CB Trip, CB close, changed of any

digital status input, Change in Relay settings etc.

Up to 100 such events can be stored and can be downloaded for detail analysis. Apart from Event

record, relay also records actual waveform of current and voltage along with all digital and logical

status during fault condition. Up to 10 such waveforms can be recorded; the duration of

disturbance record is 3 sec. The disturbance record can be trigger from physical status input

as well as from pick-up, trip operation of relay. This waveform can be downloaded through

communication port for further analysis.

22. Programmable DI /DO and LED:

The ADR244A has 10 digital outputs, 2 status dedicated for CBNO (T1) & CBNC (T2) and 8

status programmable opto-isolated input and 8 nos. of dual LEDs out of which 6 are

programmable. These can be programmed by local key board or through communication

protocol. Any logical or physical status can be assigned to any relay contact or any programmable

LEDs. Many additional functions such as Ext Reset, Thermal Reset, The disturbance record

trigger, Trip, Blocking different protection etc. can be configured to any of 8 Physical Status

Inputs.

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Whi le Order ing Specify the fol lowing Information for ADR244A Relay

Order ing informat ion:

A D R 2 4 4 A - A M - X X X - X X - X - X - X X - X

Example

ADR244A– AM-201-01-3-1-06-0

Type: ADR244A St . Back termina l layout

Aux i l ia ry Supply: 18-250V AC/DC

CT sec: 1 Amp. / 5 Amp selectable

PT sec: 63.5V P-N

Motor Protection Relay AM

201 For Adity-V2 series start from 201

01 Relay with standard Back Connection

D e f i n i t i o n o f M o d e l N o o f A d i t y a S e r i e s o f R e l a y s

A M X X X – X X – X – X – X X – X

Auxiliary Supply 01 = 18 – 52 V dc 04 = 30 V dc 02 = 77 – 250 V dc 05 = 48 V dc 03 = 24 V dc 06 = 18 – 250 V dc

Reserved for Future Use

PT Secondary 0 = NO PT 1 = 63.5 PT sec 2= 110 V

CT Secondary 1 = 1 Amp 2 = 5 Amp 3= 1Amp / 5Amp selectable

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Technical Specifications:

General specifications Sr. No. Specification Particulars

I. Current Input : Suitable for CT secondary 5Amp or 1Amp site selectable II. Aux. Supply : 77 - 250VDC or 18 – 250VDC to be specified III. VA burden on CT : Less than 0.2VA IV. VA burden on Aux. : Less than 10 Watts V. VA burden on PT : Less than 0.2 VA VI. Operating Temp. range : -10 deg. To + 65 deg. VII. Continuous carrying capacity : 2 x of rated for CT and 1.5 x of rated for PT VIII. Pick up : Within 1.1 times of set value. IX. Reset Value : 95% to 90% of pick up. X. Output Contact : 2 NO for Trip

: 1 NO + 1 NC for Protection Healthy : 8 NO General Programmable

XI. Contact Rating : Continuous: 5A : Make & carry for 0.5 sec : 30A : Make carry for 3 sec : 15A

XII. Opto Isolated input status : 1 for CB NO & 1 for CB NC : 8 are general programmable

XIII. Thermal With stand for CT : 20 x of rated for 3.0 sec.

General Setting : Unit ID 1 – 250 : Baud Rate 1200 – 57600 : Com Port RS 232 / RS 485 : Set Parity None / Even / Odd : Freq Select 50 Hz – 60 Hz :Group Select G1 – G2 : Start Criteria 52a / VI : IFL> 20 – 150 % of In : BF Enable Yes / No : I_BF 10 – 100 % of In : BF Delay 100 – 1000ms in step of 50 : CT Sec 1Amp / 5Amp : CT Primary 1 – 30000 in step of 1 : PT Primary 1.0 – 1000KV in step of 0.1V : 3 Ph V. Check Enable Yes / No : Start LV Set 10 V – 60 V in steps of 1 : Local Control Yes / No

I.

: Trip Ckt Test Yes / No

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Start up Time Supervision

: Startup time Supervision Enable Yes / No : I sup Current 1 – 5 x IFL in step of 0.5

II. Start up Time Supervision

: t sup time 1 – 180.0sec in step of 0.1 Thermal Overload

: Thermal Ol Enable Yes / No : T Inhibit Enable Yes / No : Ke 0-10 in step of 1 : Te1 1 – 180 min in step of 1 : Te2 1 – 360 min in step of 1 : Tr 1 – 999 min in step of 1 : T Alarm Enable Yes / No : T Alarm 20 – 100 % in step of 1 : T Forbid Enable Yes / No

III. Thermal Overload

: T Forbid 20 – 100 % in step of 1 Stall Detection

: Prolong Start Enable Yes / No : Istart 1 – 5 x IFL in step of 0.1 : t Istart time 1 – 200sec in step of 1 : Locked Rotor En Yes / No : Stall Detect En Yes / No : Istall 1 – 5 x IFL in step of 0.1 : t Istall 0.1 – 60sec in step of 0.01 : Reaccel En Yes / No : Reac LV Set 10 – 60V in step of 1

IV. Stall Detection

: Treacc 0.1 – 10sec in step of 0.01 Start Number Protection :

: Hot Start Enable Yes / No : Hot Start Num 1 – 5 in step of 1 : Time betw 2 Hot start 1 – 120 min in step of 1 : Cold Start Enable Yes / No : Cold Start Num 1 – 5 in step of 1 : Time betw 2 cold start 1 – 120 min in step of 1 : Hot / cold Threshold 20 – 80 % in step of 1 : Anti-Back spin (ABS) Enable Yes / No

: tABS time 1 – 60 min in step of 1

V. Start Number Protection

: Inhib.Start.Time 1 – 120 min in step of 1

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Phase Section (Ip) : IP> Enable YES / NO : IP> Settings 10% – 250% in steps of 1%. : IP> Time Multiplier (TMS) x 0.02 – x1.00 in steps of 0.01 : IP> Curve (Operating Time)

C1 – C13 ( IDMT curve for C1–C5 & C7-C13 and C6 for Define Time )

: IP> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec. : IP>> Enable YES / NO : IP>> Settings 10% – 250% insteps of 1% : IP>> Time Multiplier (TMS) x 0.02 – x1.00 in step of 0.01 : IP>> Curve (Operating Time)


: IP>> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec. : IP>>> Enable YES / NO : IP>>> Settings 50% – 3000% insteps of 10% : IP>>> Delay 0.00 – 100.00 Sec in steps of 0.01Sec. : Doubling Enable YES / NO

VI. Phase (OC)

: T safe setting 0 – 100 sec in step of 1 sec

External Earth Fault Section (IE) : IE> Enable YES / NO : IE> Settings 10% – 100% insteps of 1% : IE> Time Multiplier (TMS) x 0.02 – x1.00 in step of 0.01. : IE> Curve (Operating Time)


: IE> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec. : IE>> Enable YES / NO : IE>> Settings 10% – 100% insteps of 1% : IE>> Time Multiplier (TMS) x 0.02 – x1.00 in step of 0.01. : IE>> Curve (Operating Time)


: IE>> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec. : IE>>> Enable YES / NO : IE>>> Settings 50% – 1200% insteps of 10%

VII. EF

: IE>>> Delay 0 – 3.00 Sec in steps of 0.01Sec.

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Internally derived Earth Fault Section (3Io) : 3Io> Enable YES / NO : 3Io> Settings 10% – 100% insteps of 1% : 3Io> Time Multiplier (TMS) x 0.02 – x1.00 in step of 0.01. : 3Io> Curve (Operating Time)


: 3Io> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec. : 3Io>> Enable YES / NO : 3Io>> Settings 10% – 100% insteps of 1% : 3Io>> Time Multiplier (TMS)

x0.02 – x1.00 in step of 0.01.

: 3Io>> Curve (Operating Time)


: 3Io>> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec. : 3Io>>> Enable YES / NO : 3Io>>> Settings 50% – 1200% insteps of 10%

VIII. 3Io

: 3Io>>> Delay 0 – 3.00 Sec in steps of 0.01Sec.

Current Unbalance : Iu>> Enable Yes / No : Iu>> setting 2% - 100% in step of 1%

IX. Unbalance

: Iu>> Time 0 – 200 Sec in steps of 0.01Sec.

Negative Phase sequence Element Section : Phase Revarsal YES / NO

: I2>> Enable YES / NO

: I2>> Settings 10% – 150% insteps of 1%

: I2>> Time Multiplier (TMS) x 0.02 – x2.00 in step of 0.01.

: I2>> Curve (Operating Time)


: I2>> C6 Delay 0 – 1800.0 Sec in steps of 0.1Sec.

: I2>>> Enable YES / NO

: I2>>> Settings 50% – 1500% insteps of 10%

: I2>>> C6 Delay 0 – 3.00 Sec in steps of 0.01Sec.

: C14 t Const 0.02 – 40 sec in step of 0.01 sec : NPS Tcatrl Enable YES / NO

X. NPS

: Tmin 0.02 – 2.0 sec in step of 0.01 sec

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Under Voltage (V<, V<<) : V< Enable YES / NO : V< Setting 15V – 60V in steps of 0.1V : DT / IDMT Select DT / IDMT : V< Delay 0.00 to 100 sec in step of 0.01 : V< TMS 0.05 to 2 sec in step of 0.01 : V<< Enable YES / NO : V<< Setting 15V – 60V insteps of 0.1V : V<< Delay 0.00 to 100.0 sec in step of 0.01

XI. Under voltage (V<, V<<)

: Inhibit UV Enable YES / NO

Over voltage Section (V>, V>>) : V> Enable YES / NO : V> Setting 50V – 100V insteps of 0.1V : DT / IDMT Select DT / IDMT : V> Delay 0.00 to 100 sec in step of 0.01 : V> TMS 0.05 to 2 sec in step of 0.01 : V>> Enable YES / NO : V>> Setting 50V – 100V insteps of 0.1V

XII.

Over voltage (V>, V>>)

: V>> Delay 0.00 to 100 sec in step of 0.01

Residual O/V (VN> , VN>>) : VN> Enable YES / NO : VN> Setting 5V – 50V in steps of 0.1V : DT / IDMT Select DT / IDMT : VN> Delay 0.00 to 100 sec in step of 0.01 : VN> TMS 0.05 to 2 sec in step of 0.01 : VN>> Enable YES / NO : VN>> Setting 5V – 50V in steps of 0.1V

XIII. Residual O/V (VN> , VN>>)

: VN>> Delay 0.00 to 100 sec in step of 0.01

Under Current (I< , I<<) : I< Enable YES / NO : I< Setting 10% - 100% in steps of 1% : I< Delay 0.2 to 100 sec in steps of 0.1 : I<< Enable YES / NO : I<< Setting 10% - 100% in steps of 1% : I<< Delay 0.2 to 100 sec in steps of 0.1

XIV. Under Current ((I< , I<<)

: tI< Inhibit during start 0.05 – 300sec in step of 0.05

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Under Power Protection(P<, P<<)

: P< Enable Yes / No : P< 1 – 120 W in step of 0.1 : P< Delay 0.04 – 100sec in step of 0.01 : P<< Enable Yes / No : P<< 1 – 120 W in step of 0.1 : P<< Delay 0.04 – 100sec in step of 0.01

XV. Under Power Protection(P<, P<<)

: t Inhibit 0.05 – 30sec in step of 0.01 Over Power Protection (P>, P>>)

: P> Enable Yes / No : P> 50 – 250 W in step of 0.1 : P> Delay 0.04 – 100sec in step of 0.01 : P>> Enable Yes / No : P>> 50 – 250 W in step of 0.1 : P>> Time Delay 0.04 – 100sec in step of 0.01

XVI. Over Power Protection (P>, P>>)

: t Inhibit 0.05 – 30sec in step of 0.01 Power Factor Protection (PF Lead, PF Lag)

: PF Lead Enable Yes / No : PF Lead 0.1 – 0.9 in step of 0.1 : PF Lead Time Delay 0.05 – 100 sec in step of 0.01 : PF Lag Enable Yes / No : PF Lag 0.1 – 0.9 in step of 0.1 : PF Lag Time Delay 0.05 – 100 sec in step of 0.01

XVII. Power Factor Protection

: PF t Inhibit 0.05 – 30sec in step of 0.01 Reverse Power Protection(RP<)

: RP> Enable Yes / No : RP> 5 – 120 W in step of 1 :RP> Delay 0.04 – 100sec in step of 0.01

XVIII. Reverse Power

: RP> t Inhibit 0.05 – 30sec in step of 0.05 Under / Over Frequency Protection ( F< , F>)

: F< Enable Yes / No : F< 45 – 55 Hz in step of 1 : F< Delay 0.04 – 100 sec in step of 0.1 : F> Enable Yes / No : F> 50 – 60 Hz in step of 1

XIX. Under/ Over Frequency Prot.

: F> Time Delay 0.04 – 100 sec in step of 0.1

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Operational Indicators (Flags)

PROT.H /ERR : Green LED indicates Relay OK (Protection Healthy) : Red LED indicates Fault in following conditions. 1. Problem in relay Hardware. 2. Trip Circuit Fault

MOTOR START/STOP : Green LED indicate Motor Start (SR) Type : Red LED indicates Motor is stop (SR) Type.

XX.

L2/L3/L4/L6/L7/L8 : Programmable dual LED

Drawing References : For Block Diagram - ADV02802 : For Back Connections - ADV02902

XXI. Drawing References : For Cabinet Type - MAC01301

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The Relay Confirm to following standards.

Sr. No. Title Standard no.

Electromagnetic Compatibility Type Test: 1. High Frequency test : IEC 60255-22-1, class – III

: Frequency : 1MHz Damped Oscillatory : Longitudinal :5 KV (peak) : Duration: sec duration 2 sec. : Between input current Terminal

2. Electrostatic discharge Direct application

: IEC 60255-22-2 Class III and IEC 61000-4-2 class III. : Contact discharge: 6kV, : Air discharge: 8KV : Polarity: both +ve and –Ve polarities.

3. Indirect application : IEC-61000-4-2, Class-III

4. Fast transient disturbance : IEC 60255-22-4 and IEC 61000-4-4, class A : 1.2KV; 5/50ns; 5KHz burst duration = 15ms.

: Repetition rate 300ms; Both polarities; Ri = 50Ω; duration 1 min.

5. Surge immunity test

: IEC 60255-22-5 / IEC 61000-4-6 class 4 : Differential Mode = 2kV : Common Mode = 4kV : 1.2/50uS , 5 surges of each polarity

6. Power frequency immunity test : IEC-60255-22-7, Class-A

7. Power frequency magnetic field test

: IEC-61000-4-8, Class-V

8. Radiated electromagnetic field disturbance

: IEC- 60255-22-3 : EN-61000-4-3 : Frequency 80MHz – 1GHz

9. Conducted Disturbance induced by Radio Frequency field

: IEC 60255-22-6 / IEC 61000-4-6: 1996. : Freq. 150kHz – 80MHz, Amplitude 10 V, Modulation 80% AM @ 1 KHz

10. AC Ripple in DC supply Test : IEC 60255-11

11. Radiated emission : IEC- 60255-25

Insulation Tests: 12. High Voltage Test

: IEC 60255-5. class – III : At 2.5kV 50Hz between all terminal connected together and earth for 1 minutes

13. Impulse Voltage Test

: IEC60255-5. class – III : Test voltage: 5KV (peak) 1.2 / 50us, : Energy :0.5 J, : Polarity : + ve and – Ve : Nos. of impulses : 3 positive and 3 negative impulse : Duration between Impulses : 5 sec.

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Environmental tests:

14. Cold test Storage test : IEC-60068-2-1

15. Dry heat test : IEC-60068-2-2

16. Damp heat test, steady state : IEC-60068-2-3

17. Damp heat test, cyclic : IEC-60068-2-30

CE compliance 18. Immunity : IEC-60255-26

19. Emissive Test : IEC- 60255-26

20. Low voltage directive : EN-50178

Mechanical tests

21. Vibration : IEC 60255-21-1 class 1 : Frequency Range = 10Hz – 150Hz , acceleration. = 1gn (9.8 m/s2) : Sweep rate 1 octave/min; 20 cycle in 3 orthogonal axis.

22. Bump Test : IEC 60255-21-2 Class-1 : 1000 bumps of 10gn peak acceleration and 16ms pulse duration in each of the two opposite direction per axis as per IEC60255-21-2 class 1 No. of axes . 3.

23. Shock Withstand : IEC 60255-21-2 Clas-1 : 3 shocks of 15gn peak acceleration and 11ms pulse in each of two opposite direction . No. of axis : 3

24. Seismic Test : IEC 60255-21-3 : In single axis sine sweep in X-axis sweep (@a sweep rate of 1 octave/minute) vibration in the frequency range (5-40 Hz) at amplitude of 3.5mm or 1.0gn (whichever is less)

: In single axis sine sweep in Y-axis - sweep (@a sweep rate of 1 octave/minute) vibration in the frequency range (5-40 Hz) at amplitude of 1.5mm or 0.5gn (whichever is less)

Revision Note:

Revision No. Date Description

01 10.05.2010 Original specifications 02 19.04.2011 Setting range modify

ADR244A

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