WURM CRD-XP - Advanced Level: Compressor Parameters; Advanced Level: Alarms

CRD-XP
Page 6 of 16 Subject to technical changes CRD-XP_2005-12_EN
No. Parameter Plant Min. Max. Description
P33 Fan runup time 0mins 0mins 10 mins Run-up time of fan prior to cooling command => Chapter 5
Fan behaviour, see sequence diagram
P34 Fan rundown time 0mins 0mins 10 mins Rundown time of fan following cooling command => Chapter 5
Fan behaviour, see sequence diagram
P35 Not used
P36 Not used
P37 Not used
Advanced level: Compressor parameters
No. Parameter Plant Min. Max. Description
P38
Minimum
dwell time
0mins 0mins 20mins
Minimum dwell time of the compressor control (surge
protection).
If the actual controller value increases to above the switch-
on threshold before the minimum dwell time is reached, the
compressor remains switched off until this period has
lapsed.
P39 Minimum
operating time
0mins 0mins 20mins
Minimum operating time of the compressor control (surge
protection).
If the actual controller value falls to below the switch-off
threshold before the minimum dwell time is reached, the
compressor remains switched on until this period has
lapsed.
P40 Maximum operating
time
720min 10 mins 999mins
Maximum operating time of the compressor.
The operating time of the compressor is monitored. If the
“maximum operating time“ is exceeded, it is switched off for
the dwell time preset on P41.
P41
Defined dwell time
0mins 0mins 120mins Defined dwell time after the maximum operating time is
exceeded (see maximum operating time P40)
P42 Switch-on time 5mins 2mins 120mins Operating time for safety mode if malfunction occurs.
If the control probe (e.g. probe break) fails, an emergency
program is initiated. The cooling command is controlled with
the adjustable switch-on and switch-off period (see dwell
time P43).
P43 Dwell time 5mins 2mins 120mins Switch-off period for safety mode if malfunction occurs.
(See switch-on period P42)
Advanced level: Alarms
No. Parameter Plant Min. Max. Description
P44
Alarm delay
60mins 0mins 120mins
Period from onset of malfunction until error message is
generated
P45 Alarm delay following
defrost
90mins 0mins 180mins
Alarm delay following defrost.
The temperature monitoring function is inactive following
defrost. P45 defines the delay time following a defrost.
The alarm delay becomes effect even if a set value has
been changed. This may be the case, for example through
a shift or sharp operation.
P46 Alarm priority 1 0 (off) 3 Priority for the differentiated message by remote data
transmission or central module expansion
P47
Over-temperature
alarm
4K 0K 70K Temperature threshold for over-temperature alarm.
The temperature of the control probe is monitored for both
over and under temperatures (P48). The respective values
are the deviation and/or differential to the control set value
P01 (set value + any set value shift).
P48 Under-temperature
alarm
4K 0K 70K Temperature threshold for under-temperature alarm.
(See over-temperature alarm)
P49 Fan / alarm relay
Lu Lu ALnc
Function selection for the fan relay
Lu Fan relay
ALno Alarm relay NO, Alarm = contact closed
ALnc Alarm relay NO, Alarm = contact open (V.2.1)
(NO normally open, NC normally closed)