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 .............. 111
Ejector control ............................................................. 113
Receiver control .......................................................... 117
Parallel compression ................................................. 118
General monitoring functions ......................................... 119
Miscellaneous ........................................................................ 121
KPI calculations ..................................................................... 125
Appendix A – Compressor combinations and
coupling patterns ................................................................. 126
Appendix B - Alarm texts ................................................... 131
Contents
User Guide | Capacity controller for transcritical CO booster control AK-PC 782A
2 | BC245386497365en-000501 © Danfoss | DCS (vt) | 2019.10