B800-00-880 Issue A
Page 62
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Maintenance
Is the noise irregular and getting
progressively worse?
If so, a bearing is defective. Contact
your supplier or Edwards.
Is the pump making a constant high
pitched noise?
If so, the rotor is out of balance.
Contact your supplier or Edwards.
No Serial Comms
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
Fail signal or standby signal not
working
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
The red alarm LED flashes a error
code
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
and follow the advice
given.
Any other problems
Contact your supplier or Edwards
Contact your supplier or Edwards.
Table 25 - Fault finding (continued)
Symptom
Check
Action
Summary of Contents for nEXT240
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