Alarm Limits And Delays - Danfoss AK-CC55 Compact User Manual

AK-CC55 Compact
Function Description
Air heater start de- Time delay on transition from refrigeration phase to
lay heating phase (there is not time delay on transition
from heating phase to refrigeration phase)
Melt interval Melt function. Only for control of MT cases/rooms (-5
to +10°C). The function ensures that the evaporator
will not be blocked by ice crystals. Here you set how
often the function is to stop the refrigeration and
hence transform the ice crystals to water.
Melt period Melt period. Here you set how long an on-going melt
function is to last

Alarm limits and delays

Table 26: Alarm limits and delays
Function Description
Control state A Readout of the actual control state of the controller
Alarm status Actual alarm status
Alarm air temp. A Measured temperature for alarm thermostat
High alarm limit Readout of actual high alarm limit for the tempera-
ture monitoring
Low alarm limit Readout of actual low alarm limit for the temperature
monitoring
S3 Air ON evap. A Actual sensor value
S4 Air OFF evap. A Actual sensor value
Reset alarms Command for resetting all alarms, unless they are still
active
Alarm sensor S4% A Signal to the alarm thermostat Here you have to de-
fine the ratio between the sensors which the alarm
thermostat has to use. S3, S4 or a combination of the
two. With setting 0% only S3 is used. With 100% only
S4 is used
High alarm limit 1 Upper alarm limit. The limit value is set in absolute
value. The limit value will be raised with the night off-
set during night operation.
Low alarm limit 1 Lower alarm limit. The limit value is set in absolute
value
High alarm limit 2 Upper alarm limit. The limit value is set in absolute
value. The limit value will be raised with the night off-
set during night operation.
Low alarm limit 2 Lower alarm limit. The limit value is set in absolute
value
Alarm delay A Alarm delay (short alarm delay on air temperature). If
the upper or the lower alarm limit values are excee-
ded, a timer function will commence. The alarm will
not become active until the set time delay has been
passed. The time delay is set in minutes
Alarm delay pull- Alarm delay at tempeature pulldown conditions (long
down A alarm delay). This time delay is used during start-up,
during defrost, immediately after a defrost. There will
be change-over to the normal time delay when the
temperature has dropped below the set upper alarm
limit.
Door open alarm Time delay for door alarm
delay
Door restart inj. de- Start of refrigeration when door is open. If the door
lay has been left open, refrigeration will be started after
the set time.
Alarm delay DI 1 Time delay for digital input alarm
Alarm delay DI 2 Time delay for digital input alarm
© Danfoss | Climate Solutions | 2022.08
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, 16=Forced closing,
17=Door open, 18=Melt period, 19=Modulating
temp. control, 20=Emergency control, 23=Adaptive
superheat control, 24=Start injection, 25=Manual
control, 26=No refrigerant selected, 29=Case clean-
ing, 30=Forced cooling, 31=Door open, 32=Power-up
delay, 33=Air heating, 45=Shut down controller,
48=Adaptive liquid control
0=OFF, 1=ON
0=OFF, 1=ON
Code Short name
r63 r63 HeatStartDel
r16 r16 MeltInterval
r17 r17 Melt period
Code Short name
u00 u00 Ctrl. state
x16 --- Sum alarm
u57 u57 Alarm air
y10 --- High al. lim
y11 --- Low al. lim
u12 u12 S3 air temp.
u16 u16 S4 air temp.
x15 --- Reset alarm
A36 A36 Alarm S4 %
A13 A13 HighLim Air
A14 A14 LowLim Air
A20 A20 HighLim2 Air
A21 A21 LowLim2 Air
A03 A03 Alarm delay
A12 A12 Pulldown del
A04 A04 DoorOpen del
o89 o89 DoorInjStart
A27 A27 Al.Delay DI1
A28 A28 Al.Delay DI2
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