6
Service Guide RC8BV402 © Danfoss 2016-02
AK-CH 650 Version 2.0x
--Zone delay s
Time delay between step cut-outs in the regulation band under the “-Zone band”
Set in seconds.
Kp S4
Amplification factor for P0 regulation
Night offset K
Displacement value for suction pressure in connection with an active night
setback signal (set in Kelvin)
Tref S3 offset
Reference temperature for the temperature signal S3, i.e. when = Tref, there is no
displacement of the reference.
K1 S3 offset
Displacement of the reference for the charge temperature S4 on an increase in S3
temperature in relation to ”Tref S3 offset” of 1°C (K1 = 0 gives no displacement)
Max.Reference °C
Max. permissible suction pressure reference
Min.Reference °C
Min. permissible suction pressure reference
VSD Min. speed Hz
Minimum allowed speed before stop of Variable Speed drive (Low load condition)
VSD Start speed Hz
Minimum speed for start of Variable speed drive (Must be set higher than
“VSD Min. Speed Hz”)
VSD Max. speed Hz
Highest permissible speed for the compressor motor
Load shed limit 1
Set max capacity limit for load shed input 1
Load shed limit 2
Set max capacity limit for load shed input 2
Override limit Po
Set max load shedding override limit for suction pressure Po
Override delay 1 min
Override delay for load shed limit 1. If the suction pressure exceeds
“Override limit Po” during load shedding and the set delay has expired, the load shed
limit 1 will be cancelled
Override delay 2 min
Override delay for load shed limit 2. If the suction pressure exceeds
“Override limit Po” during load shedding and the set delay has expired, the load shed
limit 2 will be cancelled
Po pump down limit °C
Set the actual pump down limit for the last compressor
Initial start time
The time after start-up where the cut-in capacity is limited to the first compressor step.
1 comp. start delay
On new start the start of the first compressor is delayed by the set delay time so that the
brine pumps can bring the brine up to speed before start of the first compressor.
Extra cooling mode
A relay is reserved and it will be activated if the brine temperature is higher than
desired.
Extra cooling offset
Set the value (K above the reference) where the relay is to activated
Extra cooling delay
Delay time before the relay can be active. The time applies during normal regulation
Extra cooling init d.
Delay time before the relay can be active. The time applies during cooling after start-up
and after defrosting.
Suction compressor status
Measurements
AK error
When “ON”, the controller is in alarm condition.
Comp. Ctrl. temp.
Actual temperature for compressor control
S4 Cold brine supply
Actual cold brine supply temperature measured with S4 temp. sensor
S3 Cold brine return
Actual cold brine return temperature measured with S3 temp. sensor
P0 °C
Suction pressure in °C. (Measured with the pressure transmitter)
Comp. ctrl. Ref. °C
Actual reference temperature for compressor control
Compressor cap. %
Cut-in compressor capacity in % (of total capacity)
Request Comp. Cap %
Reference for compressor capacity (deviations may be due to time delays)
Cond. ctrl. temp °C
Actual temperature for control sensor (Pc or S7)
S7 warm brine °C
Actual warm brine temperature for S7 media sensor
(Only used if S7 sensor is selected as regulation sensor)
Pc °C
Condensing pressure in °C. (measured with the pressure transmitter)
Cond. ctrl. ref. °C
Actual reference temp. for condenser capacity
(incl. external reference signal, if any)
Cond. cap. %
Cut-in condenser capacity in % (of total capacity)
Request Cond. cap %
Reference for condenser capacity
VSD 1 safety
Status on safety input for variable speed controller on compressor 1
ON: Alarm
OFF: No alarm
VSD 2 safety
Status on safety input for variable speed controller on compressor 2
ON: Alarm
OFF: No alarm
Comp. 1 Status
0: Power up
Controller has been powered up/Compressor is not used
1: Stopped
Compressor hat been stopped
2: Manual
Compressor capacity is controlled manually
3: Alarm
Compressor is in alarm condition (cut out on safety)
4: Restart
Compressor is waiting for elapse of “Recycle time”
5: Standby
Compressor is ready to start
10: Full loaded All capacity cutin
11: Running
Capacity control is running
