Cause The pump is contaminated with solid parcles.
Remedy Contact Edwards or the supplier for further informaon.
The pumping speed is poor or if pump down me is too long
Cause The connecng pipelines are too small in diameter.
Remedy It is the users responsibility to provide pipework with sucient conductance to ensure that
pump performance is not c
ompromised.
Cause There is a leak in the system.
Remedy Leak check the pump system in accordance with the requirements specied in Table 9 on
pag
e 34.
Cause The motor controller is current liming the supply.
Remedy Adjust the inlet pressure/ow unl the pump performance recovers.
Cause Pumping chamber is too big.
Remedy Ensure the chamber size does not exceed the limits specied in Table 8 on page 33.
Alarm indic
ator
If the red alarm indicator LED (Figure 2 on page 12, item 9) is illuminated, contact Edwards
for further informaon.
Before performing any fault nding, lockout/tagout the electrical and nitrogen supplies.
A770-10-880A - Fault nding
Page 31
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