B777-00-880 Issue E
Page 22
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Maintenance
5.4
Fault finding
for the possible causes of faults and for the recommended actions to rectify faults.
applicable to a basic, manually controlled pumping system with an EXC Controller configured for local (manual)
operation.
Note that if you use an EXC Controller configured for remote operation to control the EXT555H pump, or if you use
an EXDC Pump Drive Module to control the EXT555H pump, some of the checks and actions in
may not apply
to your system.
Refer to the fault finding section of the instruction manual supplied with your EXC Controller or EXDC Pump Drive
Module for further fault finding information.
Table 8 - 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
lead is connected.
If all the above checks are OK then
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.
