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Troubleshooting
Symptom/alarm
Probes
alarm/
reading
Missing communication
between Hecu and PSD
(power+/Inverter)/
ALW24
MT
compressor
not start
Missing communication
between
Hecu
evaporators
(MPXPRO/ULTRACELLA)/
ALW37
Low SH alarm or DSH
alarm (ALW10/ ALT15/
ALT15)
13
Compressor Envelope
Pag. 34-EN
Possible Cause
wrong
- wrong connection
- wrong configuration
- wrong range (for pressure probe)
- wrong type of probe
- wrong placement of probe
- broken probe
-Power plus device offline.
-No
communication
HECU controller and PSD (Inverter
for compressor BLDC)
does
- Some blocking alarm is forcing off
the compressor
- Regulation status of the unit is
OFF
-
Most
of
performing a defrost (only if
evaporator
connected to the CDU via RS485)
- Wrong configuration of PSD
(power+ driver)
- Wrong connection of serial line
and
- Wrong serial address setting
- Liquid is coming back to the
compressor
- Wrong reading of SH probes
(temp. and pressure)
- Wrong reading of discharge temp
probe
Check
Check
configuration of the probe:
- type of probe
- wirings
- probes range (min and max)
- compare the value read by the probe
with the value read by a manometer
- check the PSD power supply (it must
between
be powered)
- check the RS485 wiring between
HECU and PSD
- check the serial address set in the PSD
(dip switch configuration)
- check the PSD address set in the
HECU controller
- Check the active alarm and try to reset
the alarm (consulting the alarms table
suggestions)
- Switch ON the unit
evaporators
are
- Check the Defrost setting on mask
FBB15 (only if evaporator controllers
controllers
are
are connected to the CDU via RS485)
- Force the download settings from
Hecu Controller to PSD
- Check the RS485 wirings/connection
- Check the serial address set in the
evaporator controller
- Check the protocol and baudrate
(Modbus, 19200bps)
- Check the SH in the evaporator
-
Expansion valve in the evaporator
- Check the position of the probe and
be sure they are reading properly
- (for MT Comp or Parallel comp) check
that liquid is not coming back from
RPRV valve. This can happen in case of
an overcharge of refrigerant
OEM Manual – CUBO
the
connection
Check
the
right
operation
UMT/WG T MT Rev3.0 – 08/10/2021
AQUA
2
and
the
of
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