5.5
Fault finding
Symptom
Check
Action
The pump does not rotate
after you press start; the
‘Fail’ LED is not on.
Is the EXC300M Controller
power LED on? Is the
EXC300M fan operating?
If not, check that the electrical
supply is on, check that the
switch at the rear of the
EXC300M Controller is on, check
the fuse in the rear of the
EXC300M Controller. Check that
the pump rotor is not seized. If
all of the above are OK then the
EXC300M Controller is faulty.
Consult your supplier or your
nearest BOC Edwards company.
Is the EXC300M Controller
Start/Stop LED flashing?
If so, check that the correct links
are made on the EXC300M
Controller logic interface (refer to
the instruction manual supplied
with the EXC300M Controller).
Check that any system interlocks
are correctly made (refer to the
instruction manual supplied with
the EXC300M Controller).
Check that the pump-to-
controller cable is connected
If all of the above are OK then
consult your supplier or your
nearest BOC Edwards company.
Is the EXC300M Controller
first speed indication LED
on?
If not, the EXC300M Controller is
faulty. If the LED is on, then the
EXT250M is faulty. Consult your
supplier or your nearest BOC
Edwards company.
The EXC300M Controller
trips into ‘Fail’ at any
speed
Are the system interlocks
correctly connected?
Ensure that the system interlocks
do not open after the EXT250M
has started.
The EXC300M Controller
trips into ‘Fail’ during the
ramp-up and before 50%
speed is reached.
Is the inlet pressure too high? If so, reduce the pumping load,
or check for a large leak into the
system.
28
EXT250M Turbomolecular Pump
Table 7 - Fault finding
