EN
OEM Manual – CUBO
2
AQUA
Pag. 34-EN
UMT/WG T MT Rev3.0 – 08/10/2021
34
12
Troubleshooting
Symptom/alarm
Possible Cause
Check
Probes alarm/ wrong
reading
- wrong connection
- wrong configuration
- wrong range (for pressure probe)
- wrong type of probe
- wrong placement of probe
- broken probe
Check the connection and the
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
Missing communication
between Hecu and PSD
(power+/Inverter)/
ALW24
-Power plus device offline.
-No
communication
between
HECU controller and PSD (Inverter
for compressor BLDC)
- check the PSD power supply (it must
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
MT compressor does
not start
- Some blocking alarm is forcing off
the compressor
- Regulation status of the unit is
OFF
- Most of evaporators are
performing a defrost (only if
evaporator
controllers
are
connected to the CDU via RS485)
- Wrong configuration of PSD
(power+ driver)
- Check the active alarm and try to reset
the alarm (consulting the alarms table
suggestions)
- Switch ON the unit
- Check the Defrost setting on mask
FBB15 (only if evaporator controllers
are connected to the CDU via RS485)
- Force the download settings from
Hecu Controller to PSD
Missing communication
between
Hecu
and
evaporators
(MPXPRO/ULTRACELLA)/
ALW37
- Wrong connection of serial line
- Wrong serial address setting
- Check the RS485 wirings/connection
- Check the serial address set in the
evaporator controller
- Check the protocol and baudrate
(Modbus, 19200bps)
Low SH alarm or DSH
alarm (ALW10/ ALT15/
ALT15)
- Liquid is coming back to the
compressor
- Wrong reading of SH probes
(temp. and pressure)
- Wrong reading of discharge temp
probe
- Check the SH in the evaporator
- Check the right operation of
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
13
Compressor Envelope
Содержание CUBO2 AQUA
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Страница 112: ...FR Manuel OEM CUBO2 AQUA Page 24 FR UMT WG T MT Rév3 0 08 10 2021 ULTRACELLA BMS Bornes 52 53 54 Modbus 19200bps ...
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Страница 136: ...Notes Anmerkungen Remarques ...
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