Condenser Control - Danfoss AK-CC55 Water Loop User Manual

AK-CC55 Water Loop
Function Description
Speed Kp Amplification factor Kp for PI control of speed
Speed Tn Integration factor Tn for PI control of speed
Max. Kp factor Max. Kp value at high deviation from the temperature
setpoint
ON time emergency Thermostat ON time at thermostat sensor error
OFF time emergen- Thermostat OFF time at thermostat sensor error
cy
Speed emergency The fixed speed during emergency control due to an
error on the thermostat sensor
Oil return speed Set the speed at which the compressor will run during
an oil return cycle
Oil return time peri- Set the time period for which the compressor will run
od at increased speed during an oil return cycle
Oil return speed lim- If the compressor is running below the set speed lim-
it it, an oil return counter is increased. When the coun-
ter reaches the defined "Oil return cycle time", an oil
return cycle will be initiated
Oil return interval When the counter for low speed operation reaches
this value, an oil return cycle is initiated
Resonance band Variable speed level at which the resonance band
start starts
Resonance band Width of the resonance band

Condenser control

Table 26: Condenser control
Function Description
Control state A Readout of the actual control state of the controller
S7 Brine inlet temp. Actual sensor value
S8 Brine outlet Actual sensor value
temp.
Condenser fan Actual status of output function
Max. S7 Brine temp. Max. temperature safety limit for the condenser en-
tering brine temperature. If the limit is violated, the
compressor capacity will be reduced and an alarm
will be activated. If the temperature decreases with
the set differential, the alarm will be deactivated
again and the compressor capacity will no longer be
restricted.
Max. S7 Brine temp. Temperature differential for the safety limit "Max. S7
diff. Brine temp.". If the max. temperature safety limit for
the condenser entering brine temperature is violated,
the compressor capacity will be reduced and an alarm
will be activated. If the temperature decreases with
the set differential, the alarm will be deactivated
again and the compressor capacity will no longer be
restricted.
Cond. fan cut-in Temperature setting at which the condenser fan is
started
Cond. fan diff. Temperature differential for stopping condenser fan
© Danfoss | Climate Solutions | 2022.04
Values
Values
0=Normal ctrl., 1=Hold after defrost, 2=Min ON timer,
3=Min OFF timer, 4=Drip off, 10=Main switch OFF,
11=Thermostat cut-out, 12=Frost protection S4,
14=Defrost, 15=Fan delay, 17=Door open, 18=Melt
period, 19=Modulating temp. control, 20=Emergency
control, 25=Manual control, 29=Case cleaning,
30=Forced cooling, 32=Power-up delay, 33=Air heat-
ing, 34=Comp. safety cut-out, 45=Shut down control-
ler, 50=High S7 Brine inlet
0=OFF, 1=ON
Code Short name
c82 c82 Speed Kp
c83 c83 Speed Tn
c98 c98 Speed Kp Max
c86 c86 Emergency ON
c87 c87 EmergencyOFF
c93 c93 Emerg. Speed
P79 P79 OilRtrnSpeed
P80 P80 OilRtPeriod
P77 P77 OilRtSpdLim
P78 P78 OilRtIntrval
P39 P39 Reson. start
P40 P40 Reson. band
Code Short name
u00 u00 Ctrl. state
u98 u98 S7 temp
u93 u93 S8 temp
U16 U16 Cond. fan
A76 A76 MaxS7BrineT.
A77 A77 S7Brine Diff
F24 F24 Cond. Cutin
F25 F25 Cond. diff.
BC378540472015en-000101 | 55