Stulz S-Klima C7000 User Manual page 73

Alarm signals (µPC alarms)
RS485 bus connection faulty
Sensor fracture, analog input B3 - suction gas temperature
Sensor fracture, analog input B4 - hot-gas temperature
Sensor fracture, analog input B5 - condensation pressure
Sensor fracture, analog input B6 - evaporation pressure
max. condensation pressure exceeded (> 43.5 bar)
min. suction gas pressure undershot (< 3.3 bar)
Hot-gas temperature too high
Pressure difference pc-po lower than limit value (4 bar)
Compressor does not start, poss. wiring work
Compressor exceeds max. time outside of the normal operating
range (zone 1)
Superheating too low - EE valve
MOP alarm - EE valve
Suction gas temperature too low - EE valve
Evotunes alarm
EVO control alarm (LOP, MOP, low superheating, low suction
gas temperature)
EVO system alarms (sensor fracture)
General inverter alarm (further inform. in Info menu)*
No communication with the inverter, inverter power failure
pc: Condensation pressure
po: Suction gas pressure
* You can find further information in the "Info/Components/Cooling/ICC/more/
more" menu under the "Inverter error" menu item.
Management of µPC alarms
If the µPC identifies an alarm, the compressor is switched off by the µPC. The IOC has no influence on this. Most
alarms are automatically reset by the µPC. Usually, it takes less than 30 seconds such that the compressor is auto-
matically restarted after the compressor break (180 seconds, preconfigured in µPC) or, for a very short runtime, after
the minimum new start interval (360 seconds, preconfigured in µPC).
The "Discharge temperature alarm" alarm is not reset by the µPC and must be manually reset.
The "Compressor exceeds max time allowed working out of its envelope limits" and the "General inverter alarm"
alarms are not reset by the µPC (depending on the inverter error code, some of the "general inverter" alarms are
reset by the µPC) and are handled by the IOC in a special way.
These alarms are automatically reset by the IOC but a maximum of 5 times in 24 hours. If the same alarm occurs for
the sixth time in 24 hours, it has to be reset manually.
The IOC resets the alarm 210 seconds after it occurs.
All µPC alarms are suppressed by the IOC for 240 seconds after they occur so are not shown in the status ("status"
command) or forwarded to the C7000AT. An alarm is only triggered if they are still there after 240 seconds.
But the alarm is entered in the event log immediately after it occurs.
An alarm reset that is triggered by the IOC appears there as "Automatic alarmreset to µPC".
A manual alarm reset (e.g. via the C7000AT) appears as "Alarmreset to µPC".
BA C7000 for EC Tower | EN | 01-2019 | 1000755
Cause
For all µPC alarms except for the alarm highlighted in orange, an advanced
alarm management is set, which is described in more detail below.
Alarm text
µPC COMM.LOSS
DEFECT SENSOR B3
DEFECT SENSOR B4
DEFECT SENSOR B5
DEFECT SENSOR B6
MAX DISCHARGE PRESS.
MIN. SUCTION PRESSURE
DISCHARGE TEMP
PRESSURE DIFF. LOW
COMP. START
OPERAT. RANGE LEFT.
SUPERHEATING LOW
MOP ALARM
SUCTION TEMP. LOW
EVOTUNES
EVO REGULATION
EVO SYSTEM
INVERTER
INVERT.COMM.LOSS
Effect
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
Compressor is switched off.
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