Stulz C7000 - Page 166

166 EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR a/C UNITS
Alarm text Cause Effect
BUS ERROR Controller can not be reached, is switched off Controller excluded from zone control
ADDRESS CONFLICT 2 bus participants have same bus address Controller excluded from bus communic.
µPC COMM.LOSS RS485 bus connection faulty Compressor is switched off.
DEFECT SENSOR B3
Sensor failure analog input B3 - suction gas
temperature
Compressor is switched off.
DEFECT SENSOR B4
Sensor failure analog input B4 - hot gas
temperature
Compressor is switched off.
DEFECT SENSOR B5
Sensor failure analog input B5 - condensation
pressure
Compressor is switched off.
DEFECT SENSOR B6
Sensor failure analog input B6 - evaporation
pressure
Compressor is switched off.
MAX DISCHARGE PRESS.
max. condensation press. exceeded (>43,5
bar)
Compressor is switched off.
MIN. SUCTION PRESS.
min. suction gas press. passed under (<3,3
bar)
Compressor is switched off.
DISCHARGE TEMP Hot gas temperature too high Compressor is switched off.
PRESSURE DIFF. LOW
press. difference pc-po lower than limit value
(4bar)
Compressor is switched off.
COMP. START FAILED compressor does not start, defective wiring Compressor is switched off.
OUTSIDE OF ENVELOPE
compressor exceeds max. time outside the
normal operative zone (zone 1)
Compressor is switched off.
SUPERHEAT LOW Superheat too low - EEV alarm Compressor is switched off.
MOP ALARM MOP alarm - EE valve Compressor is switched off.
SUCTION TEMP LOW Suction gas temperature too low - EE valve Compressor is switched off.
EVOTUNES Evotunes alarm Compressor is switched off.
EVO REGULATION
EVO control alarms (LOP, MOP, low superheat,
low suction gas temperature)
Compressor is switched off.
EVO SYSTEM EVO system alarms (sensor failure) Compressor is switched off.
INVERTER
general inverter alarm (further inform. in the
menu "Info/..../ICC")*
Compressor is switched off.
INVERTER COMM.LOSS
no communication to the inverter, inverter
power failure
Compressor is switched off.
* Further information can be obtained in the menu "Info/components/cooling/ICC/more/more" in menu item "inverter error".
p
c
: Condensation pressure
p
o
: Suction gas pressure
With all µPC alarms except the one with an orange background an extended alarm management is started,
which is described in detail below.
Treatment of µPC alarms
When the µPC detects an alarm, the compressor is switched off by the µPC. The C7000IOC has no effect on
this. Most of the alarms are automatically reset by the µPC, this usually takes less than 30 seconds, so that the
compressor can be automatically restarted after the compressor pause (180 seconds, pre-configured in the
µPC) or after the minimum restart cycle (360 seconds, pre-configured in the µPC).
The "Discharge temperature alarm" is not reset by the µPC and must be manually be reset.