User Guide | Capacity controller for transcritical CO booster control AK-PC 782A
2 | BC245386497365en-000503 © Danfoss | DCS (vt) | 2020.02
1. Introduction
Application .................................................................................................. 3
Principles .....................................................................................................4
2. Design of a controller
Module survey .....................................................................................................7
Common data for modules .......................................................................... 10
Controller ..................................................................................................11
Extension module AK-XM 101A ........................................................ 13
Extension module AK-XM 102A / AK-XM 102B ........................... 15
Extension module AK-XM 103A ........................................................ 17
Extension module AK-XM 204A / AK-XM 204B ........................... 19
Extension module AK-XM 205A / AK-XM 205B ........................... 21
Extension module AK-XM 208C ....................................................... 23
Extension module AK-OB 110 ........................................................... 25
Extension module EKA 163B / EKA 164B ....................................... 26
Graphic display MMIGRS2 .................................................................. 26
Power supply module AK-PS 075 / 150 / 250 ..............................27
Communication module AK-CM 102 .............................................. 28
Preface to design ............................................................................................. 29
Design of a compressor and condenser control .................................. 31
Ordering ............................................................................................................. 39
3. Mounting and wiring
Mounting............................................................................................................ 40
Wiring .................................................................................................................. 42
4. Configuration and operation
Configuration ....................................................................................................45
Connect PC .............................................................................................. 45
Authorization .......................................................................................... 47
Unlock the configuration of the controllers ................................. 48
System set-up..........................................................................................49
Set plant type .......................................................................................... 50
Set control of suction group MT....................................................... 51
Set oil management ............................................................................. 56
Set up control of condenser fans ..................................................... 57
Set-up of high pressure control ........................................................ 59
Set up control of receiver pressure .................................................60
Receiver pressure difference control "DeltaP"............................. 61
Set up control of heat recovery ........................................................ 62
Set up KPI .................................................................................................. 64
Set up Display ......................................................................................... 65
Set-up Functions for General purpose ........................................... 66
Separate thermostats ........................................................................... 67
Separate pressostats .............................................................................67
Separate voltage signals ..................................................................... 68
Separate alarm inputs .......................................................................... 68
Separate PI functions ........................................................................... 69
Configuration of inputs and outputs..............................................70
Set alarm priorities ................................................................................ 72
Lock configuration ................................................................................ 74
Check configuration ............................................................................. 75
Check of connections .................................................................................... 77
Check of settings ............................................................................................. 79
Schedule function ........................................................................................... 81
Installation in network................................................................................... 82
First start of control ........................................................................................83
Start the control ..................................................................................... 84
Manual capacity control ...................................................................... 85
5. Regulating functions
Suction group ................................................................................................... 86
Capacity control of compressors ............................................................... 87
Capacity distribution methods ......................................................... 89
Power pack types – compressor combinations .......................... 90
Compressor timers ................................................................................94
Compressor with variable capacity ................................................. 94
Load shedding ........................................................................................ 95
Injection ON ............................................................................................. 96
Liquid injection in common suction line ...................................... 96
Safety functions...................................................................................... 98
Oil management ............................................................................................ 100
Condenser / Gas cooler ...............................................................................102
Capacity control of condenser ........................................................102
Reference for condensing pressure ..............................................102
Capacity distribution .......................................................................... 104
Condenser couplings ...................................................................................105
Safety functions for condenser ................................................................105
CO transcritical system and heat recovery .........................................106
Circuit for heat recovery or hot tap water ..................................107
Circuit for recovery for heating ....................................................... 108
Circuits for control of CO gas pressure .......................................112
Ejector control ......................................................................................114
Receiver control ...................................................................................118
Parallel compression ...........................................................................119
General monitoring functions ..................................................................120
Miscellaneous .................................................................................................122
KPI calculations ..............................................................................................126
Appendix A – Compressor combinations and
coupling patterns .......................................................................................... 127
Appendix B - Alarm texts ............................................................................ 132
Contents