Danfoss VLT Inverter Scroll CDS 801 Operating Instructions Manual page 47

Fault Conditions, Messages ...
Safe Mode Status (reg. 40125 and 40126):
Bit 0, Safe Mode - EEV Indoor Failure
The communication with the indoor EEV controller has
been interrupted and the EEV controller has switched to
autonomous mode to maintain the superheating. The bit
remains logic "one" for at least 60 s after the communi-
cation is reestablished, and the system will return to
normal operation when the bit becomes logic "zero". For
information about EEV autonomous mode see EEV manual.
Bit 1, Safe Mode - EEV Outdoor Failure
The communication with the outdoor EEV controller has
been interrupted and the EEV controller has switched to
autonomous mode to maintain the superheating. The bit
remains logic "one" for at least 60 s after the communi-
cation is reestablished and the system will return to
normal operation when the bit becomes logic "zero". For
information about EEV autonomous mode see EEV manual.
Bit 2, Safe Mode - Ambient Temperature Invalid
The reading of the ambient temperature sensor (S amb.) is
not within the specified sensor range of -60 to +100 °C
(-76 to +212 °F). Possible causes are faulty wiring or a
defect sensor. The bit remains logic "one" for at least 60 s
and the system will afterwards return to normal operation
when the bit becomes logic "zero".
Bit 3, Safe Mode - Ambient Temperature not updated
40225 - External Ambient Temperature is selected as
ambient temperature source and has not been updated
within the last 60 s.
Alarm Status (reg. 40127 and 40128):
Bit 0, Alarm Peripherals Error
More than one Safe Mode condition is present.
Bit 1, Alarm Out of Envelope
The compressor has been operating outside the largest
possible operation envelope for too long time (60 or 90 s
depending on which envelope limit is violated). The
system will restart by itself after the restart timer has
elapsed (60 s). If 10 subsequent "Out of envelope" alarms
occur because of a low suction pressure (P0), the drive will
go into trip lock condition to prevent damage to the
system.
Bit 2, Alarm - Over Current
The drive has encountered an over current event and has
stopped operation. An over current can be triggered by a
phase loss, locked compressor rotor, an earth fault, a short
circuiting or a major drive error. An Earth fault triggers an
immediate trip lock, while other occurrences may happen
several times to trigger a trip lock condition.
Bit 3, Alarm – DC Link Voltage High
The drive has encountered an over voltage event (more
than 450 V) and has stopped operation. An over voltage
condition can happen due to a mains failure. 10
subsequent occurrences trigger a trip lock.
Bit 4, Alarm - Drive Temperature High
The drive has encountered an over temperature condition
and has stopped operation. An over temperature occurs
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VLT Inverter Scroll CDS 801 Operating Instructions
when the temperature measured inside the drive has
reached a critical level (> 115 °C/239 °F). Possible causes
are insufficient cooling due to a defect cooling fan,
blocked air circulation or extreme high ambient
temperature. This is an immediate trip lock condition.
Bit 5, Alarm – Supply Voltage Low
The supply voltage has dropped below 180 V and the
drive has stopped the compressor. When the supply
voltage has recovered, the drive resumes operation with
derating of the output power.
Bit 6, Alarm - Discharge Temperature High
The compressor discharge temperature (Sd) has exceeded
138 °C/280 °F and the system has been stopped. When the
temperature has normalized the drive will attempt to
return to normal operation. 10 subsequent occurrences
trigger a trip lock.
Bit 7, Alarm – Discharge Temperature Invalid
The reading of the discharge temperature sensor (Sd) is
not within the specified sensor range of -60 °C to +200 °C
(-76 °F to +392 °F). Possible causes are faulty wiring or a
defect sensor. The system will stop operation and return to
normal operation, when the problem has been fixed.
Bit 8, Alarm – OEM Communication Timeout
The OEM controller (thermostat) failed to read data within
a given time, set in register 40148. The drive stops
operating the system unless the time is set to 0 s, which
disables this function. The drive automatically resumes
operation when the communication has recovered and
data is received from the OEM controller, though waiting 2
minutes after communication has been reestablished.
Bit 9, Alarm – MOC Safety
When the motor-control-oriented micro processor safety
routines have encountered a fault (error) condition, the
system stops for safety reasons and goes to a trip lock
condition immediately.
Bit 10, Alarm – DC Link Voltage Low
The DC Link voltage in the drive has reached a critical low
level and the drive has stopped operation. When the DC
link voltage has recovered, the drive resumes operation.
Bit 11, Alarm – Suction Pressure Invalid
The reading of the suction pressure transmitter is not
within the specified sensor range of 0 to 16 bar (0 to 232
psi). Possible causes are faulty wiring or a defect
transmitter. The system stops operation and returns to
normal operation, when the problem has been resolved.
Bit 12, Alarm - Condenser Pressure Invalid
The reading of the condenser pressure transmitter is not
within the specified sensor range of 0 to 50 bar (0 to 725
psi). Possible causes are faulty wiring or a defect
transmitter. The system stops operation and returns to
normal operation, when the problem has been resolved.
Bit 13, Alarm – Condenser Pressure Low
If the condenser pressure remains at a critical low level
after the start-up sequence, the drive reports an alarm.
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