B722-40-880 Issue H
Page 52
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Maintenance
5.5.1
Flashing error codes
Whenever a Fail condition becomes active, the standard once-per-revolution flash on the Status LED is replaced with
the Error Flash Codes that reflect all active error conditions. The Fail status flash code positions, within the Status
LED error flash sequence, are specified in
.
There is a sufficient off period between each subsequent cycle repetition to clearly mark the start of a new flash
sequence. The duration of a long flash (L) is equal to 3 times the duration of a short flash (s).
Note:
The status LED error flash sequence is capable of signalling multiple fail conditions. For example, error
flash code sLssLs signifies both error 2 (Podule failed internal configuration and calibration operation) and
error 5 (pump internal measurement system disconnected or damaged).
5.5.2
Decoding system status words
When using the serial communications link, additional information that may be useful for fault finding is available to
be accessed. When sending a query to monitor measured motor speed, the pump also returns a System Status Word.
The send command is as follows:
The reply will be as follows, where the first returned number refers to motor rotational speed in revolutions per
second (Hz):
Table 23 - Flashing error codes
Error flash
position
Error flash
code
Comments
Actions
0
ssssss
The speed fell below 50% of full
rotational speed with the Timer
disabled.
Check whether the pump is too hot or
whether the inlet pressure is too high.
1
Lsssss
Podule internal software mismatch.
Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
2
sLssss
Podule failed internal configuration
and calibration operation.
Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
3
ssLsss
Failure to reach or maintain half full
speed within the timer setting value.
Check whether the pump is too hot or
whether the inlet pressure is too high.
4
sssLss
Over-speed or Over-current trip
activated.
Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
5
ssssLs
Pump internal measurement system
disconnected or damaged.
Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
6
sssssL
Serial enable becomes inactive
following a Serial Start command.
Re-activate Serial Enable and send a
Serial Stop command to clear the error
code.
Command
?
v
8
5
2
cr
Reply
=
v
8
5
2
sp d
d
d
d
;
h
h
h
h
h
h
h
h
cr
