Danfoss AK-PC 551 User Manual page 11

Comp. 1 min cap.
Comp. 1 start cap
Comp. 1 Sd temp.
Comp. 1 Sd max.
No.of unloaders
Comp. safety input
LP switch via DI
Load shedding via DI
Sd disch. gas temp.
Ss suction superheat
Injection ON fct.
Compressor timers
Lead comp. Min ON
Lead comp. Min OFF
Lead comp. Restart
Lead comp. Safety
delay
Comp. Min ON
Comp. Min OFF
Comp. Restart
AK-PC 551
*: For scroll and CRII
Minimum capacity in the time period (without a minimum capacity the compressor
will not be cooled)
*: For scroll and CRII
Start capacity: the compressor will only start when the capacity requirement reaches
the value
*, **: For "Scroll", "Stream" and CRII
Define whether the controller should monitor the discharge gas temperature Sd from the
compressor (NTC 86K or Pt 1000 Ohm).
*, **: For Scroll, Stream, CRII and yes to "Comp.1 Sd temp"
Set the maximum Sd temperature
****: For compressor with unloaders
Set how many unloaders there are on the compressor
Compressor safety circuit
Define whether a DI input should be reserved for registration of each compressor safety
circuit
Low pressure safety circuit
Define whether a DI input should be reserved for registration of the signal from an LP switch
Load limitation
Define whether a DI input should be reserved for registration of the signal from
a power meter
• None:
• DI: Load limitation must follow a DI input
• Night Mode: Load limitation must follow the status of the day/night signal.
(The day/night signal can be received via a DI input, via time schedule or network.)
Shared discharge temperature
Define whether signals from a common Sd sensor on the suction line (Pt 1000) should be
received
Monitoring of superheat
Define whether a signal from a common Ss sensor on the suction line should be received
Stop injection into evaporators
If the compressors are prevented from starting, stop injection into the evaporators.
Here define whether the function should be active and how the signal should be
communicated.
No: The function is not used
Network: The controller sends a signal to the system unit, which then forwards it to
the evaporator controls
Relay: The function reserves a relay that pulls in if all compressors are stopped.
All evaporator controls must be wired to this signal from the relay.
Compressor timers
Min. On-time for first compressor
Set a forced On-time here during which the compressor will remain in operation before it
can be switched off again. The setting is to prevent incorrect operation.
To prevent a compressor breakdown, the setting must be made in accordance with the
requirements of the compressor supplier.
Min. Off-time for first compressor
Set the forced Off-time during which the compressor must be off before it can be switched
on again. The setting is to prevent incorrect operation.
Min. period of time for re-starting the first compressor.
Set the forced Off-time during which the compressor must be off before it can be switched
on again. The setting is to prevent incorrect operation.
To prevent a compressor breakdown, the setting must be made in accordance with the
requirements of the compressor supplier.
Delay time before compressor no. 1 cut out for reasons of safety
The time begins when a signal is received on the DI input (configure the DI input via
"Configuration" and "Comp. safety inlet").
Min. On-time for remaining compressors
Set a forced On-time here during which the compressor will remain in operation before it
can be switched off again. The setting is to prevent incorrect operation.
Min. Off-time for remaining compressors
Set the forced Off-time during which the compressor must be off before it can be switched
on again. The setting is to prevent incorrect operation.
Min. period of time for restarting remaining compressors
Set the forced Off-time during which the compressor must be off before it can be
switched on again. The setting is to prevent incorrect operation.
User Guide RS8GY302 © Danfoss 2015-06
Min: 10%
Max: 50%
Fac: 10%
Min: 10%
Max: 60%
Fac: 30%
AI-demand
No / Yes
Fac: No
Min: 0°C
Max: 195°C
Fac: 125°C
DO-demand
Min: 1
Max: 3
Fac: 1
DI-demand
Yes /No
Fac: Yes
DI-demand
Yes /No
Fac: No
DI-demand
Yes /No
Fac: No
AI-demand
Yes /No
Fac: No
AI-demand
Yes /No
Fac: No
DO-demand
No /Network /Relay
Fac: No
Min: 0 min
Max: 60 min
Fac: 0 min
Min: 0 min.
Max: 30 min
Fac: 0 min
Min: 1 min.
Max: 60 min
Fac: 4 min
Min: 1 min.
Max: 10 min
Fac: 1 min
Min: 0 min.
Max: 60 min
Fac: 0 min
Min: 0 min.
Max: 30 min
Fac: 0 min
Min: 1 min.
Max: 60 min
Fac: 4 min
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