Pag. 28-EN UMT/WG T MT Rev3.0 – 08/10/2021
Blocking alarm for high pressure
prevent.
When GC pressure rises above the
prevent threshold the compressor
speed is reduced up to switch off
the compressor. The threshold is
settable in mask Hb01
Decrease the compressor
speed and after a delay
Shut off the compressor
Al_Clock.
No communication between CPU
and Internal clock
Disable all functions
involving scheduler
Extended memory error. Faulty
controller
Unreliable condition because of no
MPXPRO connected. The unit will
switch OFF in xx hours.
System shut off the unit when some
controller for evaporators have
been configured in fieldbus but
they result off-line
Low shuperheat alarm.
Low SH alarm settable by mask
Cae30 (threshold and delay). A
warning for Low SH will be issued
without any delay
No action (by default). A
compressor shut off can be
configured by mask Cae30
Automatic
/ manual
(settable
by mask
Cae30)
DSH Low liquid flowback.
This alarm occurs when suction SH
is lower than 0 K AND discharge SH
(DSH) is lower than 10 K for a
period higher than the one set in
mask Cae41
Automatic
/ manual
(default)
HPV Valve position warning.
HPV valve opening is higher that a
threshold for a certain time
(settable by mask Fhb30)
RPRV valve opening is higher thnt a
threshold for a certain time
(settable by mask Fhb31)
Warning setpoint HPV. Gas cooler
press.too low/high, different from
current setpoint.
Difference between Gas Cooler
Pressure and HPV setpoint is
greater than the threshold set on
mask Fhb20 (disabled by default).
High receiver pressure alarm.
Receiver Pressure higher than
alarm threshold settable by mask
Fhb28
Shut off compressor
(according to configuration
made in mask Cbe42 and
Fhb28)
Warning low superheat.
Suction SH of MT/LT compressor
lower than alarm threshold (set on
mask Cae30). No delay is used to
issue the warning.
No action (it is just a
warning)
Power plus device offline.
No communication between HECU
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