Danfoss AK-PC 781 User Manual

AK-PC 781 Version 4.1x Menu operation RC8CE202 © Danfoss 03/2013 5
S4 media temp. °C Actual media temperature measured at S4 sensor
(Only used if S4 is selected as control sensor)
Pctrl °C Actual regulation pressure measured with Pctrl pressure transmitter (cascade
pressure)
Suction status 0: Power up Controller has been powered up (power supply re-connected)
1: Stopped Capacity control has been stopped ("Main switch" = OFF or
"Control mode" = OFF)
2: Manual Capacity is controlled manually ("Control mode" = MAN)
3: Alarm Capacity control is in alarm condition (fx. alarm on Po Min
or Pc Max)
4: Restart Capacity control is waiting for elapse of “Restart time”
5: Standby Capacity control is ready to start
6: State o timer
7-10: State on timer
11: Unloaded
12-14: Unload cutin
15: Full loaded All capacity cutin
16: Running Capacity control is running
Actual Zone Actual zone for capacity regulation:
0: P0-error
1: - - Zone
2: - Zone
3: NZ
4: + Zone
5: + + Zone
Suction superheat K Actual superheat
Night Setback Status of night setback function
ON: Night (An increase of the evaporating pressure is permitted)
OFF: Normal situation
Load shed 1 Actual status on Load shed input 1
Load shed 2 Actual status on Load shed input 2
Injection ON Status of the “Injection ON” function (earlier mentioned “AKC ON”)
0: Forced closing of all AKV valves
1: Normal operation of AKC controllers
MT release output Actual status on ”Comp. release” output signal from MT controller
MT request input Actual status on ”Comp. request” input signal on MT controller
LT request output Actual status on ”Comp. request” output signal from LT controller
LT release input Actual status on ”Comp. release” input signal on LT controller
No. of compressors Dened number of compressors
Comp. application Select the compressor application required (see the manual for further details)
0: Single step only
1: 1xComp. w. unloaders + Single step
2: 2xComp. w. unloaders + Single step
3: Comp. w. unloaders only
4: 1xVariable speed + Single step
5: 1xVariable speed + Comp. w. unloaders
6: 2xVariable speed + Single step
Step control mode Selected coupling pattern for compressors
Sequential: Compressors are cut in/out in strict accordance
with compressor number
Cyclic: Runtime equalisation between compressors
Best t: Compressors are cut in/out in order to
make the best possible t to actual load
0: Sequential
2: Cyclic
3: Best t
Settings Main switch Main switch: ON: Regulation
OFF: Controller stopped
Cap. control mode 0: MAN (The compressor capacity will be controlled manually)
1: OFF (The capacity control will be stopped)
2: AUTO (The capacity is controlled by the PI controller)
Manual capacity % Manual setting of compressor capacity
The value is in % of total capacity controlled by the controller
Reference mode Displacement of suction pressure as a function of external signals
0: Reference = set reference + night oset + oset from external 0-10 V signal
1: Reference = set reference + oset from P0 optimization + night oset

Danfoss AK-PC 781 Specifications

General

Brand	Danfoss
Model	AK-PC 781
Category	Controller
Language	English