02_Inverter Mini Chiller System and Control

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Technical Training 2008Technical Training 2008

TECHNICAL TRAININGTECHNICAL TRAINING

20082008


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Inverter Mini ChillerInverter Mini Chiller

System and ControlSystem and Control


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1. Introduction1. Introduction

2. Basic Inverter Technolo!2. Basic Inverter Technolo!

". Co#$onents". Co#$onents

%. Control Alorith#%. Control Alorith#

&. 'rotection&. 'rotection

Content


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Introduction


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&AC("0 CR

&AC(&&)*& CR

&AC(100)1"&)210 CR

Introduction


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+odel+odelCa$acit! ,-/Ca$acit! ,-/

CoolinCoolin HeatinHeatin

&AC(0"0CR&AC(0"0CR *.%*.% ..

&AC(0&&CR&AC(0&&CR 1%.&1%.& 1.121.12

&AC(0*&CR&AC(0*&CR 20.&220.&2 21.21.

&AC(100CR&AC(100CR 2*.802*.80 2."02."0

&AC(1"&CR&AC(1"&CR "8.&%"8.&% %1.%*%1.%*

&AC(210CR&AC(210CR &8.2&8.2 1.&&1.&&

Introduction


7/53Technical Training 2008Technical Training 2008

Conventional Bac- to Bac- Circuits B'HE

'ri#ar! Circuit 1 'ri#ar! Circuit 2

econdar! Circuit

'ri#ar! Circuit 1 'ri#ar! Circuit 2

&AC( True 3ual Circuits B'HE

New Technology BPHE- True Dual Circuits

Introduction



Conventional !ste#

Inverter !ste#

Inverter Compressor

Introduction


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The s!ste#45The s!ste#45

Inverter

AC/DC

Rectifiert

u

t

Power supply

Input frequency

50Hz t1

50 Hz100 Hz

15 Hz

DC/AC

Inverter

(compressor motor input)

P!

Basic Inverter Technolo!


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Inverter Basic tructureInverter Basic tructure

Inversion

'LC Control

Recti7ication

AC AC

3C Lin-

Converter

'+ inal

+'

+




Recti7ication CircuitRecti7ication Circuit

" E+I 7ilter to #ini#i;e e#ission e77ect ,E+C/ and raise i##unit!E+I 7ilter to #ini#i;e e#ission e77ect ,E+C/ and raise i##unit!level ,E+/level ,E+/" 'TC to cushion start5u$ current to ca$acitor'TC to cushion start5u$ current to ca$acitor" 3iode



3C tae3C tae

" '=C ca$acitor acts to cur< '= losses caused

ta



Inversion CircuitInversion Circuit

" Consists o7 IGBT ,Insulated Gate Bi$olar Transistor/Consists o7 IGBT ,Insulated Gate Bi$olar Transistor/" Controllin the 9N)9= lin-aes> di77erent 7re:uenc! and voltae o7 "5Controllin the 9N)9= lin-aes> di77erent 7re:uenc! and voltae o7 "5

$hase AC can



Ite#Ite# =i?ed $eed AC=i?ed $eed AC Inverter ACInverter AC

Ener! avinEner! avin NoNo @es>

Te#$. =luctuationTe#$. =luctuation 2C 2C 0.&C 0.&C

AdDust to LoadAdDust to Load NoNo @es@es

tart5u$tart5u$ Current sure o7 *5Current sure o7 *511?11?

o7t5start. Noo7t5start. Nocurrent surecurrent sure

=ull Load 9$.=ull Load 9$. NoNo @es> o$erates at@es> o$erates athih 7re:.hih 7re:.

$eed o7 Cool)Heat$eed o7 Cool)Heat lo6lo6 =ast=ast3e7rostin3e7rostin Less e77icientLess e77icient Accurate and 7astAccurate and 7ast

'rotection =eatures'rotection =eatures BasicBasic Co#$leteCo#$lete

Auto5+ode =eaturesAuto5+ode =eatures BasicBasic Co#$leteCo#$lete

Advantaes o7 Inverter Air ConditionersAdvantaes o7 Inverter Air Conditioners




Components



f#n motors

He#t

e$c%#n&ers wit%&ol' fin #s

st#n'#r'

#ter pump

rue 'u#l circuits PH*

(r#ze' pl#te %e#t

e$c%#n&er)

*$p#nsion

t#n+ ( ,-)Control .o$

#ssem.ly

Coil &u#r's#n &u#r's

Co#$onents


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Co#$onents

E+I =ilter

=unction"E+I =ilter is a device $laced


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C t


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'o6er Board

:To convert recti7ied 3C current

F&0(3Cto res$ective desired voltaes:12(3C rela!:+C F&(3C:I'+ F1&(3C

:Ensure sta


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Ca$acitor Board

Co#$onents


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Control Algorithm

C t l Al ith


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General Control =lo6 ChartGeneral Control =lo6 Chart

;t#rt

1o

;top Inverter Comp

=es

;top pump

20s

Cl#s% .etween

current > selecte'

mo'e of oper#tion?

Coolin& mo'e

1o

He#tin&?1o

=es=es

He#tin& mo'e

;ystem 9n?

=es

Coolin&?1o

70s

;top i$e' Comp

Control Alorith#

C t l Al ith


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(ariaet temp : ;?>C

T : ? to C

Control Alorith#

Control Alorith#


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(aria


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Control Alorith#


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=i?ed 3rive Co#$ressor Control=i?ed 3rive Co#$ressor Control

Cooling mode

Start up condition :

Pump runs normally for 3 minutes *

T water return T set ; 4C

No irreersi!le errors in %&ed drie and t"esystems

Satisfy a delay of 3 minutes !efore restart #

Note 9 I% variale drive system starts 6rst! the 6)ed drivesystem will only start a%ter the %re@uency o% variale drivedrops to '(H/#

* epends on Parameter P2 +,ow switc" alarm delay at pump start) -in (s' ma& .//s' default.0(s 1#epends on Parameter C2 +compressor min stop time) -in (s' ma& .//(s' default .0(s1

.or e)ample 9Water return temp :;=>C

et temp :;?>CT :C


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Cooling mode

Coolin mode selected water pump starts utdoor fan starts compressor starts

utdoor fan will start sec !efore compressorstart


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Cooling mode

S"ut down condition :

Coolin mode terminates' 8

T set 9T water return ; 2C and aria!le fre7uency drops pass

2(56


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(aria


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R#te' req6

5Hz

5Hz

t

@ min 70 sec 7 min

919

919

#ri#.le 'rive comp

9ut'oor f#n

919#ri#.le

5 sec

(aria


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(aria


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Heating modeStart up condition :

Pump runs normally for 3 minutes *

T set : T water return ; 4C

No irreersi!le errors in %&ed drie and t"esystems

Satisfy a delay of 3 minutes !efore restart #

Note 9 I% variale drive system starts 6rst! the 6)ed drivesystem will start a%ter the variale drive %re@uency drops to'(H/#

* epends on Parameter P2 +,ow switc" alarm delay at pump start) -in (s' ma& .//s' default.0(s 1#epends on Parameter C2 +compressor min stop time) -in (s' ma& .//(s' default .0(s1

.or e)ample 9et temp :C

Water return temp :8=>CT :C

Control Alorith#

Control Alorith#


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Heating mode5eatin mode selected water pump starts


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Heating modeS"ut down condition :

5eatin mode terminates' 8

T water return9 T set ; 2C


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'u#$ Control'u#$ Control

Pump start up="en startin t"e system' pump will run for 3 minutes *!efore proceedin to ne&t step)

Depen's on P#r#meter P8 (flow switc% #l#rm 'el#y #t pump st#rt6 !in 0s4 !#$ 7s4

'ef#ult 780s)

Pump s"ut down

>fter !ot" compressors s"ut down for . minute' pump s"uts

down)

Control Alorith#


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Protection


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'rotection


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Co#$ressor 9ver5Current 'rotectionCo#$ressor 9ver5Current 'rotection

2ariale drive compressor

InvInvCo#$Co#$

CurrentCurrent

+&AC(+&AC(0"00"0

+&AC(+&AC(0&&0&&

+&AC(+&AC(0*&0*&

+&AC(+&AC(100100

+&AC(+&AC(1"&1"&

+&AC(+&AC(210210

IIaa

22 20.&20.& 20.&20.& 20.&20.& 20.&20.& 20.&20.&

II


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Co#$ressor 9ver5Current 'rotectionCo#$ressor 9ver5Current 'rotection

.i) drive compressor

="en %&ed compressor current ; $e) T"e compressor will stops andresumes after 3 minutes

Note: ="en eit"er drie oerload protection occurs more t"an 3 timeswit"in 3( minutes' system triers irreersi!le error protection)

=i?ed co#$ressor sto$sCo#$ a#$

,A/

Ie

'rotection

'rotection


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Hih 3ischare Te#$erature 'rotectionHih 3ischare Te#$erature 'rotection

2ariale drive system="en aria!le drie disc"are temperature reac"es ..(C' systemstops)="en aria!le drie disc"are temp) !etween .((C and ..(C'fre7uency drops)="en aria!le drie disc"are temperature is less t"an /?C and moret"an .((C'

fre7uency increased restricted)="en disc"are temperature falls !elow /4C' normal operationresumes)

!ste# shuts do6n

=re:uenc! ste$ do6n

+aintain 7re:uenc!

Nor#al o$eration

Co#$ressor

dischare

te#$erature

110C

100C

*C%C

'rotection


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'rotection


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9utdoor Coil Hih Te#$erature 'rotection9utdoor Coil Hih Te#$erature 'rotection

2ariale drive system

urin coolin' w"en Tcoil.; @( C' fre7uency drops)

urin coolin' w"en Tcoil.A C' system resumes)

.i)ed drive system

urin coolin' w"en Tcoil2; @4C' compressor stops)

urin coolin' w"en Tcoil2A .C' system resumes)

'rotection

'rotection


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Lo6 'ressure 6itch 'rotectionLo6 'ressure 6itch 'rotection

>larm delayed at compressor startup : 3( sec depends onParameter P3*)No protection durin defrostin)$f aria!le drie or %&ed drie low pressure switc" is actiatedfor seconds' alarm will !e triered)

P#r#meter P@ (-ow pressure #l#rm 'el#y #t compressor st#rt up6 !in0s4 m#$7s4 'ef#ult@0s)

1ote E If low pressure #l#rm occur more t%#n @ times wit%in

@0 minutes4 system s%uts 'own to irreversi.le error6

'rotection

'rotection


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Hih 'ressure 6itch 'rotectionHih 'ressure 6itch 'rotection

$f %&ed drie "i" pressure switc" is actiated for 3( sec'alarm will !e triered)$f aria!le drie "i" pressure switc" is actiated'

fre7uency of aria!le drie compressor will decrease at.56Bs) $f it is re9actiated for 3( sec' alarm will !e triered)

1ote E If %i&% pressure #l#rm occur more t%#n @ times wit%in

@0 minutes4 system s%uts 'own to irreversi.le error6

'rotection

'rotection


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$f 3 p"ase >C p"ase se7uence is incorrectlyconnected' system will not start and controller willindicate error) System will resume afterrecti%cation) +e&cept ->C(3(C81

$f p"ase missin "appens' system will not operate)

Controller will indicate error) System will resumeafter recti%cation)

8 Phase &C Phase e@uence Protection

8 Phase &C Phase *issing Protection

'rotection


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Than- @ouThan- @ou

02_Inverter Mini Chiller System and Control

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