MicroTenn II Instruction Manual

TENNEY ENGINEERING, INC.

How to set your TOD start

1. Select FULL ACCESS.

2. Press TIME OF DAY key until 000000 appears in the lower

display. (If a time of day start was previously entered that

time will be displayed.) The starting time display differs

from real time in that it is a fixed time value.

3. Press the number keys for hours, minutes, seconds of time

desired for automatic start.

4. Press ENTER.

5. Press ENTER again.

6. Press number keys for the desired starting step, usually 1.

7. Press ENTER.

How to enable your TOD start

Note: you must have loaded your program into RAM either from the

keyboard of from the command cartridge.

1. Select FULL ACCESS.

2. Press HOLD.

3. Press RUN.

4. Press 00.

5. Press ENTER.

When the time of day start point is reached, the hold lamp

turns off, and run lamp turns on. Make sure the chamber has

power, and that all circuit breaker are closed.

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If a program is running when the start time occurs, that

program will continue to run, and the start time for alternate

program will be ignored.

How To Use Automatic Shut-Down

To automatically shut down the chamber at the end of your

program, do the following:

1. Enter a next step instruction of the same number as

the current step.

2. Enter time value. At the end of the entered time period,

the chamber will automatically shut down. All outputs will turn off.

OUTPUTS TO CONDITIONING EQUIPMENT

Auto Output

Here is how to make your chamber's conditioning equipment

respond to commands from MicroTenn:

1. Press AUTO.

MicroTenn now varies outputs to automatically create desired

conditions in the chamber. The status of these outputs may be

displayed as follows:

2. Press AUTO again.

The upper display identifies the output number. Lower display

shows the on - off state of that output. L indicates on; 0 indicates

off. If the output is time-proportioned (output 3, 7, 12,14, or 15)

lower display shows on - off state and percentage of output, 0 to

100%. See page for logic details.

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To review the state of any output, press the number key

of that output; then press ENTER.

MANUAL Output,

In order for manual output to be used, dip switch #2 must

be in the up (closed) position.

Caution: This mode locks on outputs manually and can cause

uncontrolled runaway conditions. It is used for special purposes

only. Pressing the MANUAL OUTPUT key once holds all outputs steady;

they are no longer under automatic control, so be careful.

Here is how to manually change outputs:

1. Press MANUAL OUTPUT again. Channel No. 1 can now be

changed as follows:

2. Enter any number between -100 to -1 (minus 100% to

minus 1%) for cooling. Alternately, enter 0 to 100 for heating.

Cooling output can be set only on chambers using proportioned

cooling (output 07).

3. Press ENTER.

4. Press ENTER again.

5. Channel 2 output may now be set.

6. Enter any number between -100 to - 1 (minus 100% to minus

1%) for dehumidification. Alternately, enter 0 to 100

for humidification.

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OPERATING A TEMPERATURE-HUMIDITY

CHAMBER WITH TEMPERATURE ONLY

When operating a temperature-humidity chamber with temperature

only, select -0 (minus zero) for channel 2 (humidity setpoint).

Unless -0 (minus zero) is selected for humidity, the chamber will

not perform at lowest temperatures, and win attempt to simulate

some humidity level.

To operate with humidity, select the appropriate positive

value of humidity desired.

When you are operating without humidity (minus zero mode) a

request for humidity read-out will result in the display showing

-50 (minus fifty). This display is not significant.

THE DIP SWITCH

#1. Start 22.. logic

Automatic restart (down-open) means that after power inter-

ruption the MicroTenn will restart, and the chamber will continue

running its program from the point of interruption.

Cold start (up-closed) means that after power interruption

MicroTenn will be energized but the program will not resume and

the chamber will not be conditioned. Manual restart is then

required.

This switch is factory-set for automatic restart.

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#2. Manual Output Enable

This switch allows the manual output (front panel) switch to

be used. Up (closed) enables; down (open) disables.

This switch is factory-set at disabled.

#3. Guaranteed Soak

Guaranteed soak automatically places the programmer on "hold"

when workspace temperature deviates more than a desired degree

from setpoint.

Allowable deviation is keyed into the deviation alarm. Setpoint

is keyed into the programmer in the usual way. The programmer is

then automatically "held" until chamber temperature comes within

deviation tolerance of setpoint.

For example:

Assume that the chamber is at ambient. 100 C is keyed in as

setpoint and 5 C keyed in as deviation alarm. As the chamber heats,

MicroTenn will remain on "hold" until temperature reaches 95 C.

"Hold" will then be released. Assume that the next setpoint is 0C.

As the chamber pulls down, MicroTenn is on "hold" until temperature

reaches +5 C.

In order to select guaranteed soak, throw the switch to be up

(closed) position.

This switch is factory-set to disable guaranteed soak, down (open).

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#4. Printer/CRT

This switch selects baud rate for printer or CRT. It is

factory set for printer, up (closed). CRT and printer are

options not found on all chambers.

OPENING THE INSTRUMENT PANEL

The instrument panel in which MicroTenn is mounted is

hinged left and has a snap catch at its right. It is also

held tightly closed by a thumbscrew which is installed at

Tenney.

Should you want to swing open the panel, make certain

all power is off.

COMMAND CARTRIDGE OPERATION KEYS

PROG ID

Program identification.

Allows you to review or flag for deletion programs that are

currently in the command cartridge library.

READ

Read from command cartridge.

Allows you to read a program from the command cartridge into

the MicroTenn II.

WRITE

Write to command cartridge.

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Allows you to copy the program currently in the MicroTenn II

into the command cartridge library. Also allows you to delete

a program from the command cartridge library if the program has

been flagged for deletion via the PROG ID key.

REQUIRED CONDITIONS

Before the command cartridge can be addressed by the READ,

WRITE, or PROG ID keys four conditions must exist:

I. The Entry Lockout key must be in the Full Access

position.

2. The Programmer must be in Hold.

3. The Controller must be off.

4. The timed log feature (if option is used) must be

off.

If these conditions are not met, an error message will be

displayed when one of the keys is pressed. See Error Message

List Page.

COMMAND CARTRIDGE INITIALIZATION

This procedure clears the command cartridge library of all

programs. The initialization procedure can be used to completely

erase a command cartridge if its programs are no longer needed

or if the cartridge is not functioning properly due to noise

during a READ or WRITE procedures.

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1. ACTION: Press the WRITE key.

SYSTEM RESPONSE: Three minus signs appear in the lower

display.

2. ACTION: Press the zero key on the numeric keypad three

times. Then press the ENTER key.

SYSTEM RESPONSE: The lower display clear momentarily and

then displays three minus signs.

PROG ID KEY PROCEDURES

To Review Identification Numbers

1. ACTION: Press the PROG ID key.

SYSTEM RESPONSE: Both displays clear and all data lamps turn

off. Then the lower display shows the first program identi-

fication number or displays "EPL" for "Empty Program Library".

2. ACTION: Press the ENTER key consecutively to review all

program identification numbers (3 possible).

SYSTEM RESPONSE: The program identification numbers are dis-

played in the order that they were entered.

3. ACTION: Press the decimal (.) key to display the ID number of

the current MicroTenn II program.

SYSTEM RESPONSE: The lower display shows the program identi-

fication number.

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To Flag a Program For Deletion

NOTE

Delection of programs from a command cartridge

library is accomplished by using the PROG ID

key to identify the program to be deleted and

then by using the WRITE key to clear the

command cartridge library of the programs that

have been flagged to be deleted.

1. ACTION: Use Steps 1 and 2 from "To Review Identification

Numbers" until the identification number of the program to

be deleted is displayed the lower display.

SYSTEM RESPONSE: The lower display shows a 3-digit number

of a program.

2. ACTION: Press the minus key (-) on the numeric keyboard.

SYSTEM RESPONSE: The identificaticya number flashes, in-

dicating that the program with that number has been

flagged for deletion.

3. ACTION: To select another ID number for deletion, press the

ENTER key consecutively to scroll eie number into the display.

Then press the minus key (-).

SYSTEM RESPONSE: The ID number flashes, indicating that the

program with that number has been flagged for deletion.

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NOTE

The deletion flag can be removed from memory by

bringing the flash identification number to the

display and pressing the minus key (-) again.

To Complete Program Deletion


SYSTEM RESPONSE: All data lamps are off and the upper display

is clear. The lower display flashes an input prompt which is

three dashes "---".

2. ACTION: Press the ENTER key.

SYSTEM RESPONSE: The lower display is cleared and the program(s)

flagged for deletion are deleted from the command cartridge by

a WRITE operation. When the WRITE is complete, the lower dis-

play shows the input prompt of three minus signs "---".

READ KEY PROCEDURES

The READ key allows you to read one of the 3 possible programs

(with controller settings) from the command cartridge into the

MicroTenn II.

1. ACTION: Press the READ key.

SYSTEM RESPONSE: The upper display clears, all data lamps turn

off, and the lower display shows the input prompt of three

dashes "---".

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2. ACTION: Enter the 3-digit identification number of the

program to be read from the command cartridge.

SYSTEM RESPONSE: The identification number flashes.


SYSTEM RESPONSE: If the identification number is found in

the command cartridge library, the identified program,

including controller settings, is read from the cartridge.

If the number is not found, an error message is shown.

An error message will be shown if there is not a command

cartridge in the receptacle.

WRITE KEY PROCEDURES

This procedure allows you to store the program and controller

settings currently in the MicroTenn II in the command catridge

library.


SYSTEM RESPONSE: The lower display shows the input prompt of

three dashes. The upper display and all data lamps are off.

2. ACTION: Enter a 3-digit profile identification number between

001 and 999.

SYSTEM RESPONSE: The identification number flashes.


SYSTEM RESPONSE: The lower display Is cleared. The program and

controller settings are stored in the command cartridge. When

the WRITE procedure is complete, the lower display shows the

input prompt of three dashes and the upper display is clear.

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OPERATING REMINDERS

1. Be sure proportional band PB and reset are properly

entered.

2. Verify every program.

3. Each time you press a key, make sure there is a response.

To every key stroke there is a visual response.

4. Press, don't tap the keys.

5. The ENTER key is used to alternate between channel #1 and

#2 for the following:

a. Setpoint

b. Actual conditions

c. Deviation

d. Proportional band

e. Reset

6. If no time is entered in a step, that step time will auto-

matically be one second.

7. When a program starts to run, the first thing displayed is

actual temperature. This display lasts one second.

8. To stop the chamber from running during a program (such as

to open the door) press OFF: press HOLD. To start the chamber

again, press AUTO: press RUN: Press ENTER.

9. When you are programming temperature and humidity, and

want to stop the humidity function: write a step for the same

temperature and -0.0 for humidity, with zero time for the step.

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Then, write another step with the new temperature and -0.0 for

humidity, with zero time for the step. Then, write another step

with the new temperature, -0.0 for humidity, and desired time

for the ramp.

10. There are 510 steps available. .-lowever, 51 are assigned

to each identified program. If a program requires only 21 steps,

the balance of 30 steps cannot be "borrowed" and used for the

following program.

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MICROTENN MANUAL

PART 2

GENERAL DESCRIPTION

General Information

Tenney's MicroTenn is a microprocessor-based programmable

instrument, designed to control temperature and humidity or

altitude. A programmer with two setpointversus-time profiles

(common time base) determines the process variable setpoints

as they change with time. The program is started by the

operator using the keyboard, or by a time of day clock which

is internal. Each loop has dedicated logic functions which

aid in control. Control loops and programmer functions are

described below.

Physical Description

The basic component is a a panel mount unit. MicroTenn's

panel unit interfaces via switching modules with the Tenney chamber.

Digital displays, enter keys, lamp indicators, and cartridge

on the panel unit provide an operator interface allowing easy entry

of programs from keyboard or from command cartridge. MicroTenn is

optionally equipped to communicate via an RS 232 port on the back of

the unit.

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Functional Description

Tenney's MicroTenn programmer is a 51 step, dual profile,

single time base device which allows you to change temperature

(Channel 1) and humidity or altitude (optional Channel 2) as

time progresses. Temperature range is fromIttitOMP4010fict;

Humidity or altitude setpoints are entered within the para-

meter of 0.0 % to 100.0 %. Other enteries in a step are:

events, step time, repeats and next step. The following

describes these five entries:

The Five Entries of Each Step

1. Setpoints may change as time progresses when the pro-

grammer is in the run mode. Setpoints for profiles may be

entered in each step. The setpoint for each profile may be

set manually when the programmer is in the hold mode and

remains at that value until it is manually changed or the

programmer is placed in the run mode.

2. Events may be turned on or off from the keyboard,

either manually, or programmed to transfer as time progresses.

Eight events are supplied as on/off drives for solid state

(SSR) relays. When a program is running selected event

state change at the beginning of a step.

3. Step Time is entered in hours, minutes, and seconds,

but may not exceed 18 hours per step. This parameter dictates

the length of time in which the setpoint profile output will

ramp or hold its value for a give step.

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4. Repeats cell MicroTenn to jump back to a previous step

and repeat that step, or a sequence of previous steps, a

specified number of times after that, the next sequential

step is executed. This number cannot exceed 15. Nested

looping is allowed (cycles within cycles may be programmed).

A recycle to a previous program step causes an immediate

change in the setpoint value. The recycle occurs to the end

of the specified step. Events are not updated for the recycle

step.

5. Next Step directs the sequencing of steps as they are

executed by the programmer. The number entered may be any step

numbered 1 through 51.

Run and Hold Modes

The programmer can be operated in either of two modes. Each

is described below:

Run Mode

In run mode, MicroTenn executes the programmed steps as time

progresses, finally holding setpoint and events at the values

programmed in the last step of the program. The run mode may be

activated by the time of day start or by the keyboard.

Any time during the run mode, the hold mode can be entered.

In hold, the setpoint programmer output, time into step and event

status are maintained. The manual setpoint and program mode can

be entered from the hold state. When transferring from the manual mode to

the run mode, setpoint transfer is bumpless. Depending on the

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keystroke sequence used, the next programmer output calculation will

be determined using either the time that remained in the step when

the transfer from manual to run occurred, or the entire step time.

Both hold and run modes may be initiated from external inputs.

When external restart is used, the setpoint programmer will begin

running at step 1 of the currently running program. MicroTenn

must be in run mode to accept external start.

Hold Mode

In hold mode, the programmer will stop execution of the

instructions in each step. It will hold the outputs and events

at their current values until the operator manually changes the

values or until the run mode is continued. The five instructions

entered in each step may be changed in hold mode.

When the hold mode is entered from the external hold con-

tact, the program will stop but the instructions in each step

cannot be changed.

The Command Cartridge

Programs may be stored in for reuse. Command cartridge

capacity is three 51-step programs per side.

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Controller

MicroTenn's controller offers precise temperature measure-

ment and control in the range of -100 to 200C. A 100 ohm

platinum RTD sensor measures chamber temperature, providing

for the temperature loop.

An optional second loop is used to measure and control

either relative humidity or altitude from 0 to 100. A dif-

ferential thermocouple measures dry-wet bulb depression for

relative humidity measurement. A 0 to 5 volt input from a

transducer is used for altitude measurement.

Proportional band and reset for each of the control loops

is operator-settable.

Temperature channel (#1) is monitored by deviation from

setpoint and hi-lo limit alarms which are operator-settable.

If a deviation occurs, a contact closes. This contact is used

for special requirements only.

If a limit alarm occurs, the chamber conditioning system

is deenergized and a buzzer sounds.

The limit alarm system actuates via a mechanical relay

associated with the Watch Dog Timer, whic'a also monitors the

operating system in MicroTenn.

Proportional band, reset, deviation, and limit alarms can

be stored as part of each program stored in the command cartridge.

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Battery Backup

The battery backup protects the on board RAM, including the

user's current program, for five years.

KEY DESCRIPTIONS

HOLD KEY selects the programmer's operating state where

setpoints and event outputs remain constant and do not advance

with time. A program will not run when the Hold lamp is on;

and the data in any segment may be changed. (Refer to the

MANUAL SETPOINT and PROGRAM keys.)

When this key is pressed, the programmer is placed in hold

state. The red lamp above the hold key lights.

RUN KEY selects the operating state where the programmer

sends setpoint instructions to the controller, as well as in-

structions to the timed event switches. The run mode may be

accessed by 1) setting the time of day start 2) pressing the

RUN key and indicating a starting segment: 3) pressing an ex-

ternal restart switch. When the external restart switch is

pressed, even though a program is currently running, the pro-

grammer will restart at step 1.

When the RUN key is pressed, the lamp above the RUN key

flashes, and the hold lamp is lit. The lower display flashes

the current step. A new step may be selected. When the

ENTER key is pressed, the lower display flashes channel 1

actual temperature once, then displays channel 1 setpoint.

The run lamp is lit; the programmer lamp flashes, and the

hold lamp is off. The upper display shows the current step.

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If the scroll arrow is pressed, data for event states,

step time elapsed, repeats elasped (in the current step),

next step instruction, and program time (total elapsed) are

displayed.

MANUAL SETPOINT KEY selects the operating state where

setpoint or event states may be changed manually. This key

functions only if the programmer is in hold mode. When this

key is pressed, the red lamp flashes above the MANUAL SETPOINT

key and the setpoint lamp is lit. The lamp above the PROGRAMMER

key is also lit. The display shows current channel 1 set-

point data. Further directions for using, the manual mode

are in the procedures.

PROG KEY selects the operating state where the program

instructions for each step may be entered into the MicroTenn

memory. This key is functional only if the programmer is in

hold mode. When this key is pressed, the red lamp above it

flashes. The lamp above the PROGRAMMER key is aso lit.

NOTE: The HOLD key must be pressed before the PROG

key is functional.

STEP ADVANCE KEY may be used to advance from one step to

the next step when a program is being entered or verified. The

PROGRAM key lamp is on.

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TIME OF DAY displays the current time of day and allows

you to enter the time of day into the MicroTenn memory and set

a twenty-four clock. When this key is pressed a second time,

an instruction to start a program automatically by the time of

day may be entered.

OFF KEY places the controller in the off state and turns

all outputs off. The lamps above MANUAL OUTPUT and AUTO turns off.

MANUAL OUTPUT KEY, is enabled only when dip switch #2 is in

the UP (Closed) position when pressed once, places the controller

in the manual state (open loop). All variable outputs are held

steady and are no longer under automatic control. The manual

lamp is lit. When this key is pressed again time, the

manual lamp flashes and the controller lamp is on. The lower

display shows channel 1 output. At this time, percent output

may be changed: -1 to -100 for cooling and 0 to 100 for

heating. Pressing ENTER allows similar manipulation for channel

2 from 0 to 100%.

AUTO KEY, when pressed once, places the controller in the

automatic mode (closed loop). The outputs change to keep the

precess variable (temperature, humidity) value equal to setpoint.

The red lamp above the key turns on.

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When the AUTO key is pressed a second time, the auto

lamp flashes and the controller lamp is on. Data for 16

outputs from MicroTenn may be reviewed in this mode.

PROGRAMMER/CONTROLLER KEY offers two positions. Each

time it is pressed, it alternately selects either "programmer"

or "controller." When programmer is selected, the upper

light blinks. When controller is selected, the lower light

blinks.

Controller mode arranges circuits so that press of scroll

arrow key allows you to review actual, deviation, proportional

band, reset, deviation set, alarm, and limit alarm settings.

Programmer mode arranges circuits so that pressing of

the scroll arrow key allows you to review setpoint, events,

step time, repeats, next step, and program time.

NOTE: Pressing of the ENTER key alternately toggles the

display between channel #1 (temp.) and channel #2 (Humid).

This applies to setpoint, actual, deviation, and proportional.

SCROLL KEY moves the MicroTenn pointer lights from left

to right: along the data line. This key, an arrow, is used to

review or change the segment data (PROGRAA key) or review pro-

cess control data (PROGRAMMER/CONTROLLER Key).

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LOAD TOP DISPLAY KEY, when pressed, moves dynamic (changing)

data in the lower display to the upper display for reference.

KEYSWITCH has three positions, allowing you to select a

specific operating state for the entire unit. The Full Access

position :Ls self-explanatory. The operate position allows all

access except program (into memory) and changing of any outputs.

Lockout position is used when MicroTenn is interfaced with a

host computer or when no operator input is desired.

CLEAR SWITCH clears the display, much the same as on a hand

calculator. Clears E messages.

ENTER KEY enters new values for various parameters. Al-

ternates between channel 1 and channel 2. (See note under

PROGRAMMER/CONTROLLER Key.) Enters instructions.

ON/OFF KEY alternates event status from on to off and vice versa.

PRINT KEY actuates optional external print routines.

NUMERIC KEYS enter values for all pa7ameters.

PROG ID KEY allows you to identify programs that are

currently in the cartridge library.

READ KEY allows you to read a profile program from the

command cartridge into MicroTenn or send a new copy of the

operating system to MicroTenn.

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WRITE KEY allows you to transfer a profile program

from MicroTenn's memory to the cartridge.

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ERROR MESSAGES

SYSTEM STARTUP MESSAGES

Code Meaning

E0-01 Cold Start init'l selected and executed

E0-02 Cold Start init'l executed due to standby power failure

E0-04 Cold Start init'l due to auto-restart abort

EO-10 Auto Restart init'l selected and executed

EO-20 Auto Restart init'l w/no profile idle found

OPERATING SYSTEM ERROR MESSAGES

Command cartridge Displays:

Code Meaning

E4-01 Required conditions for command cartridge displays are

missing.

E4-02 Identification number is not found in command cartridge

library.

E4-04 Identification number entered is currently in use.

R4-08 The indentification number library is full.

Programmers:

Code Meaning

E5-01 Illegal segment number encountered.

E5-02 Illegal next point number encountered.

E5-04 Illegal re-cycle next point number found.

E5-08 Illegal set point value found ($0000)

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MicroTenn II Instruction Manual

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