Danfoss AK-PC 551 User Manual page 14

Fan status
Fan speed
VSD start/stop
Fan 1
Fan 2.....
Fan Runhours
VSD Runtime total
Fan 1 Runtime total
Fan 2.....
Fan cycles
VSD cycles
Fan 1 Cycles total
Fan 2...
Safety monitoring
PoA Min limit
PoA Max alarm
PoA Max delay
Superheat Min lim A
Superheat Max lim A
Superheat delay A
SdA Max limit
PoB Min limit
PoB Max alarm
PoB Max delay
Superheat Min lim B
Superheat Max lim B
Superheat delay B
SdB Max limit
Pc max limit
Tc Max limit
Pc Max delay
HP switch via DI
Safety restart time
Sensor alarm reset
14
Fan status
Here a reading of the desired condenser fan capacity is provided in %
Fan operation (frequency converter) status can be read here
The status of relay 1 (step 1 or relay for frequency transformer) is indicated here
The status of relay 2, 3, etc. (step 2, 3, etc.) is indicated here
Fan Run hours
The number of hours the fans have been in operation (frequency converter operation) can
be read here
The number of hours fan relay 1 has been in the On-position (frequency transformer
has been On) is indicated here
The same function for the remaining fans
Number of fans starting
The number of fan starts (frequency converter) can be read here
The number of times fan relay 1 has been in the On-position (frequency converter
has been on) is indicated here
The controller checks that the fan has been active within the last 24 hours. If not,
it will be forced to start in 5 minutes, in rotation with the other fans.
The same function for the remaining fans
Safety limits for min. PoA
If a low value is registered, all compressors will cut out
Alarm limit for high PoA
If a high value is registered, an alarm will be generated
If a higher value is registered during a load limitation, the load limitation will be cancelled
until Po has returned to the reference.
Delay time for issuing a PoA max. alarm
Alarm limit for insufficient superheating
(Superheating is measured in the suction line by PoA and SsA.)
Alarm limit for excess superheating
Delay time before alarm is generated for insufficient or excess superheating
Safety limit for max. SdA
At 10 K under the set value, the compressor capacity will be reduced, and the entire
condenser capacity will cut in.
If the threshold is exceeded, the entire compressor capacity will cut out.
Same settings for a suction group B
Safety limit for max. Pc
If Pc exceeds the value set here minus 3 K, the entire condenser capacity will cut in,
and compressor capacity will be reduced by 1/3 for every 30 seconds.
If Pc exceeds the threshold value, the entire compressor capacity will immediately cut out,
and an alarm will be generated when the delay time expires.
Safety limit for max. Tc
The above setting for Pc max. limit can be read as a temperature here.
Time delay for Pc max. alarm
The alarm will only be generated when the time delay has elapsed.
Signal from an HP switch
Define whether a signal is to be received on a DI input here.
The status of the signal can be read, and an alarm can be linked to it.
Once a signal is received, compressor capacity will cut out.
Delayed start-up following safety cut-out
If a safety cut-out has occurred due to "Sd max. limit", "Pc max. limit" or "Po min. limit",
the compressors must be kept stopped for a defined period of time. The amount of
time can be set here.
Reset alarm after sensor error
When a sensor error has occurred, an O.K. signal must be registered within a specified
number of minutes before the controller resets the alarm. The regulation will be resumed
as soon as the sensor signal is O.K.
User Guide RS8GY302 © Danfoss 2015-06
Min: -120°C (-1.0 bar)
Max: 30°C (159 bar)
Fac: -40°C (0.5 bar)
Min: -30°C (-1.0 bar)
Max: 100°C (159 bar)
Fac: 100°C (5.0 bar)
Min: 0 min.
Max: 240 min.
Fac: 5 min.
Min: 0 K
Max: 20 K
Fac: 0 K
Min: 20 K
Max: 80 K
Fac: 80 K
Min: 0 min.
Max: 60 min.
Fac: 5 min.
Min: 0°C
Max: 195°C
Fac: 80°C
Min: -1 bar
Max: 159 bar
Fac: 40 bar
-
Min: 0 min.
Max: 240 min.
Fac: 0 min.
DI-demand
Yes /No
Fac: No
Min: 0 min.
Max: 60 min.
Fac: 1 min.
Min: 0 min.
Max: 30 min.
Fac: 10 min.
AK-PC 551