User Guide
|
Capacity Controller, AK-PC 651
© Danfoss | ADAP-KOOL® | 2015.10
10 | RS8HA102 |
First step runtime
At start-up, the cooling system must have time to cool down before PI regulation takes over
the regulation role and can cut in the next compressor.
Set the time before the next compressor may be started here.
Min: 0 s
Max: 300 s
Fac: 120 s
Pump down
Pump-down function
To avoid too many compressor starts/stops at a low load, it is possible to define a pump-
down function for the last compressor. In this case, the compressor will be cut out when the
current suction pressure is down at the set “Pump-down limit Po”.
(The setting must be greater than the safety limit for low suction pressure “PoA Min Limit”.)
Yes /No
Fac: No
Min: -80°C (-1.0 bar)
Max: 30°C (50.0 bar)
Facb: -40°C (0.3 bar)
Load shed limit
Capacity limitation at “low shed signal”
Set how much compressor capacity can be cut in when a signal is received from either a DI
input or a system device via data communication.
The value must not be set lower than the compressors’ lowest capacity step/”Start speed”.
Min: 0 %
Max: 100%
Fac: 100%
Emergency cap. day
Emergency capacity in the event of a malfunction of the regulation sensor (suction pressure
sensor)
Set the desired capacity that will apply during daytime operation.
(If the S4 media temperature sensor becomes damaged/defective, use Po for regulation.)
Min: 0 %
Max: 100%
Fac: 50%
Emergency cap. night Emergency capacity in the event of a malfunction of the regulation sensor (suction pressure
sensor)
Set the desired capacity that will apply during night operation.
(If the S4 media temperature sensor becomes damaged/defective, use Po for regulation.)
Min: 0 %
Max: 100%
Fac: 25%
Comp. start delay
Delay of compressor start after forced closing of expansion valves (at the end of a forced
close signal)
The delay will result in the system device receiving a start signal for all the evaporator con-
trols involved before the first compressor is started.
Min: 0 s
Max: 180 s
Fac: 30 s
Injection OFF delay
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.
Min: 0 s
Max: 300 s
Fac: 120 s
Configuration
Configuration
Control sensor
Select the regulating sensor for the suction circuit:
• Pressure transmitter Po
• Media temperature sensor S4 (brine regulation). (Po is used for safety)
AI-demand
Po / S4
Fac: Po
Compressor mode
Set the type of compressor to be used for regulation:
• CRII6+Multi **
)
First compressor is CRII6 compressor. The remaining ones are with unloaders
• CRII6+Single **
)
First compressor is CRII6 compressor. The remaining ones are
one-step units
• Stream 6+Multi: **
)
First compressor is a stream 6 compressor. The remaining ones are with
unloaders
• Stream 6+Single: **
)
First compressor is a stream 6 compressor. The remaining ones are
one-step units
• Multi all:****
)
All compressors have unloaders
• Multi + Single:****
)
First compressor has unloaders. The remaining ones are one-step units
• Speed+Multi: ***
)
First compressor is speed-controlled. The remaining ones are with unload-
ers.
• Speed+Single: ***
)
First compressor is speed-controlled. The remaining ones are
one-step units
• CRII4+Multi **
)
First compressor is CRII4 compressor. The remaining ones are with unloaders
• CRII4+Single **
)
First compressor is CRII4 compressor. The remaining ones are
one-step units
• Stream 4+Multi: **
)
First compressor is a stream 4 compressor. The remaining ones are with
unloaders
• Stream 4+Single: **
)
First compressor is a stream 4 compressor. The remaining ones are
one-step units
• Digital scroll: *
)
First compressor is a digital scroll. The remaining ones are one-step units
• Single-step only: All are one-step compressors
• None:
DO-demand /
AO-demand
Fac:
Single step only
No. of compressors
Set the number of compressors on the suction circuit
DO-demand
Min: 1
Max: 8
Fac: 0
Lead comp. size
Set the nominal compressor capacity for the first compressor (it is defined under
“Compressor mode”)
That is, the capacity of either a “Digital scroll”, “Stream”, “Variable speed” or
“First compressor with unloaders”
Min: 1 kW
Max: 100 kW
Fac: 1 kW
Comp. size
Set the nominal compressor capacity of the other compressors
For single-step only: All are of the same size, including the first.
For unloader all: All are of the same size, including the first.
Min: 1 kW
Max: 100 kW
Fac: 1 kW
VSD Min. speed
***: For speed
Min. speed at which the compressor will cut out
Min: 10 Hz
Max: 60 Hz
Fac: 30 Hz
VSD Start speed
***: For speed
Minimum speed at which the compressor will start (must be set to a higher value than
“VSD Min. speed”)
Min: 20 Hz
Max: 60 Hz
Fac: 45 Hz