Danfoss ADAP-KOOL AK-PC 572 User Manual page 11

Pump down
Injection OFF delay
Configuration
Compressor mode
No. of compressors
Lead comp. 1 size
Comp. 2 size
Comp. 3 size
VSD Min. speed
VSD Start speed
VSD Max speed
CRII Period time
Comp1 min Cap
Comp1 start Cap
Compressor timers
Lead comp.1 Restart
Comp. Restart
AK-PC 572
Pump down function
To avoid too many compressor starts/stops with low load, it is possible to define a pump down
function in which the compressors are stopped when the suction pressure falls to "Pump down
limit Po".
This limit has been set at 6 K below the reference point for Po.
Delay of the forced closing of expansion valves, if the controller calls for cut in of compres-
sors, but the compressors are in a locked situation and therefore cannot start.
Configuration
Set the type of compressor to be used for regulation:
• Multi + Single:*** ) First compressor has unloaders. The remaining ones are one-step units
• CRII4+Single ** ) First compressor is CRII4 compressor. The remaining ones are
one-step units
(In the event that CRII is selected it will not be possible to select oil management)
• Single-step only: All are one-step compressors
• None:
Set the number of compressors on the suction circuit MT
This is a total amount.
If regulating with two compressors only, DI3 and DO3 can be used for the AUX1 function.
Set the nominal compressor capacity for the first compressor (it is defined under
"Compressor mode")
Set the nominal compressor capacity for c ompressor 2
Set the nominal compressor capacity for c ompressor 3
***: For speed
Min. speed at which the compressor will cut out
***: For speed
Minimum speed at which the compressor will start (must be set to a higher value than
"VSD Min. speed")
***: For speed
Highest permitted speed for compressor
**: For CRII
Set the period time for the unloader valve (on time + off time)
**: For CRII
Configure the minimum capacity at which the compressor will stop
**: For CRII
Configure the capacity at which the compressor will stop
Compressor timers
Min. period of time for re-starting the first compressor.
Set the forced on+Off-time before it can be switched on again. The setting is to prevent incor-
rect operation.
To prevent a compressor breakdown, the setting must be made in accordance with the
requirements of the compressor supplier.
Min. period of time for restarting remaining compressors
Set the forced On+Off-time before it can be switched on again. The setting is to prevent
incorrect operation.
User Guide RS8KH202 © Danfoss 2019-03
Yes /No
Fac: No
Min: 0 s
Max: 300 s
Fac: 120 s
DO-demand
Fac:
Speed+single
DI + DO-demand
Min: 1
Max: 3
Fac: 3
Min: 1 m3h
Max: 20 m3h
Fac: 1 m3h
Min: 1 m3h
Max: 20 m3h
Fac: 1 m3h
Min: 1 m3h
Max: 20 m3h
Fac: 1 m3h
Min: 10 Hz
Max: 60 Hz
Fac: 30 Hz
Min: 20 Hz
Max: 60 Hz
Fac: 45 Hz
Min: 40 Hz
Max: 120 Hz
Fac: 60 Hz
Min: 10 s
Max: 60 s
Fac: 20 s
Min: 10 %
Max: 50 %
Fac: 10 %
Min: 10 %
Max: 100 %
Fac: 30 %
Min: 1 min.
Max: 60 min
Fac: 5 min
Min: 1 min.
Max: 60 min
Fac: 5 min
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