B753-03-880 Issue F
Page 28 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
If the inside of the EXT pump is contaminated, it may not be possible to achieve the specified ultimate vacuum, or
pump-down time may increase. In these circumstances, you should return the pump to an Edwards Service Centre,
where the pump will be dismantled and cleaned. Use the procedure given in the forms at the end of this manual to
return the pump.
You can use any organic solvent to clean the external surfaces of the EXT pump. We recommend that you use non-
CFC solvents, such as isopropanol or ethanol. Use a cleaning solution which is suitable for the contaminants on the
pump surfaces.
For environmental reasons, keep wastage of cleaning solutions and solvents to a minimum.
5.5 Fault finding
Refer to Table 4 for the possible causes of faults and for the recommended actions to rectify faults. Table 4 is
applicable to a basic, manually controlled pumping system with an EXC Controller configured for local (manual)
operation.
Note that if you use an EXDC Pump Drive Module to control the EXT pump, or if you use an EXC Controller configured
for remote operation to control the EXT pump, some of the checks and actions in Table 4 may not apply to your
system.
Refer to the fault finding section of the instruction manual supplied with your EXDC Pump Drive Module or EXC
Controller for further fault finding information.
Table 4 - Fault finding
Symptom Check Action
The pump does not rotate. After
pressing start - Fail LED not lit.
Is the EXC Controller power LED lit? If not, check that the electrical
supply is on, check that the switch at
the rear of the EXC Controller is on,
check the fuse in the rear of the EXC
Controller.
If all of the above are OK then the
EXC Controller is faulty. Consult
Edwards or your supplier.
Is the EXC Controller Start/Stop LED
flashing?
If so, check that the correct links are
made on the EXC Controller logic
interface (refer to the instruction
manual supplied with the EXC
Controller).
Check that any system interlocks are
correctly made (refer to the
instruction manual supplied with the
EXC Controller).
Check that the pump-to-controller
cable is connected.
If you have made all of the above
checks and cannot identify the cause
of the fault, consult Edwards or your
supplier.
Is the EXC Controller first speed
indication LED lit?
If not, the EXC Controller is faulty. If
lit, then the EXT pump is faulty.
Consult Edwards or your supplier.
The EXC Controller trips into Fail - at
any speed.
Are the system interlocks correctly
connected?
Ensure that the system interlocks do
not open after the EXT pump has
started.
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