Display Messages; Alarm Recovery - Emerson XEV22D Installation And Operation Manual

Driver for stepper electronic expansion valves
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16 Display Messages

Message
Cause
None of the digital in-
nA
puts configured as
CCL are activated
The PEd time is
Pf
elapsed and the regu-
lation is stopped.
Temperature probe
P1
fault
Pressure transducer
P2
fault
High superheat alarm
HSH
Low superheat alarm
LSH
Low pressure limit
LPL
Maximum Operating
MoP
Pressure
Lowest Operating
LoP
Pressure
Start Function en-
StF
abled
Regulation stop
StP
caused by Std and Sti
Memory anomaly
EE
Table 16-1 - Alarm Signals

Alarm Recovery

16.1. Alarm Recovery
the fault in the probe; they automatically stop few sec-
onds after the probe restarts normal operation. Check
the connections before replacing the probe. Maxi-
Outputs
mum and minimum alarms HSH, LSH, MoP, and
Valve closed
LoP automatically stop as soon as the variable returns
to normal values.
Valve closed after
PEd. There is a
to verify memory integrity. Alarm EE flashes when a
probe error.
failure in the internal memory is detected. In this case,
According to PEo
call for service.
and PEd
According to PEo
and PEd
By PI
Valve closed
See LPL parame-
ter
See dML parame-
ter
See dML parame-
ter
See SFd parameter
Valve closed
Probe alarms P1 and P2 start a few seconds after
The controller is provided with an internal check
Display Messages • 19

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