B800-00-880 Issue D
Page 70
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Maintenance
Is the pump making a constant high
pitched noise?
If so, the rotor is out of balance.
Contact the supplier or Edwards.
No serial comms
Check that the electrical supply is
on, that the serial link is connected
and that the serial enable line is
active
Check slide switch is in the correct
position for RS232 or RS485
communication.
Left for RS485
Right for RS232
Right for parallel control and
monitoring
Check baud rate and, if operating in
multi-drop mode, the node address
matches those of the pump.
Check that the red light is not on or
flashing
If LED is on, perform the checks
against the red alarm LED symptoms
Fail signal or standby signal not
working
Check the serial enable line is
inactive
Must be disconnected or driven high
for use of standby and fail lines
Check slide switch is in the correct
position for the RS232 or RS485
communication.
Left for RS485
Right for RS232
Right for parallel control and
monitoring
Yellow service LED is flashing a
repeated sequence
See flashing service codes in
Section 5.5.1
The red alarm LED is on
Normal during the software upgrade
process.
At other times indicates a problem
has been detected in the FLASH
memory
If during software upgrade then
complete the upgrade process.
Otherwise cycle power and if this
does not help then perform a
software upgrade.
The red alarm LED is flashing
Note the position of the long flashes
within the series of 6 flashes to work
out the error code.
Look up the flashing error code in
Section 5.5.8
and follow the advice
given.
Any other problems
Contact the supplier or Edwards
Contact the supplier or Edwards.
Table 25 - Fault finding (continued)
Symptom
Check
Action
