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BA C7000 for EC Tower | EN | 01-2019 | 1000755
Cause Alarm text Effect
RS485 bus connection faulty µPC COMM.LOSS Compressor is switched off.
Sensor fracture, analog input B3 - suction gas temperature DEFECT SENSOR B3 Compressor is switched off.
Sensor fracture, analog input B4 - hot-gas temperature DEFECT SENSOR B4 Compressor is switched off.
Sensor fracture, analog input B5 - condensation pressure DEFECT SENSOR B5 Compressor is switched off.
Sensor fracture, analog input B6 - evaporation pressure DEFECT SENSOR B6 Compressor is switched off.
max. condensation pressure exceeded (> 43.5 bar) MAX DISCHARGE PRESS. Compressor is switched off.
min. suction gas pressure undershot (< 3.3 bar) MIN. SUCTION PRESSURE Compressor is switched off.
Hot-gas temperature too high DISCHARGE TEMP Compressor is switched off.
Pressure difference pc-po lower than limit value (4 bar)
PRESSURE DIFF. LOW Compressor is switched off.
Compressor does not start, poss. wiring work COMP. START Compressor is switched off.
Compressor exceeds max. time outside of the normal operating
range (zone 1)
OPERAT. RANGE LEFT. Compressor is switched off.
Superheating too low - EE valve SUPERHEATING LOW Compressor is switched off.
MOP alarm - EE valve MOP ALARM Compressor is switched off.
Suction gas temperature too low - EE valve SUCTION TEMP. LOW Compressor is switched off.
Evotunes alarm EVOTUNES Compressor is switched off.
EVO control alarm (LOP, MOP, low superheating, low suction
gas temperature)
EVO REGULATION Compressor is switched off.
EVO system alarms (sensor fracture) EVO SYSTEM Compressor is switched off.
General inverter alarm (further inform. in Info menu)* INVERTER Compressor is switched off.
No communication with the inverter, inverter power failure INVERT.COMM.LOSS Compressor is switched off.
Alarm signals (µPC alarms)
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”.
For all µPC alarms except for the alarm highlighted in orange, an advanced
alarm management is set, which is described in more detail below.
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