B722-40-880 Issue F
Page 54 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
Any organic solvents can be used to clean the external surfaces of the pump. Edwards recommends using non-CFC
solvents, such as isopropanol or ethanol. Use a cleaning solution that 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 23 for the possible causes of faults and the recommended actions to rectify faults.
Table 23 - Fault finding
Symptom Check Action
The Podule LEDs do not flash for 0.5
seconds when system switched on
Has the electrical supply failed? Ensure that the electrical supply is
switched on and the fuses (and
current limiting devices) have not
been tripped.
The pump does not rotate after a
parallel Start command is supplied
Check that the electricity supply is
on and whether the Fail output is
active
If there is a Fail signal, check
whether the orange status LED is
flashing. If it is, refer to
Section 5.5.1. If power is supplied,
there is no Fail signal and the rotor
still does not rotate then there is a
fault with the pump.
The pump does not rotate after a
serial Start command is sent
Check whether the pump returns a
reply to the Start command
If there is no reply, check that the
serial communications link is plugged
in and that Serial Enable is active
and that the electrical supply is on.
Check whether the orange status LED
is flashing. If it is, refer to 5.4.1.
The pump does not respond in multi-
drop mode
Check that the multi-drop is enabled Make sure the pump has a multi-drop
address and that commands are sent
using the multi-drop protocol.
The orange status LED flashes an
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
Section 5.5.1 and follow the advice
given.
The green Normal LED does not go on
or the pump is not rotating at full
speed or the pump fails whilst
running
Is the inlet pressure too high? If so reduce the pumping load or
check for a gross leak into the
system.
Is the pump running too hot? Increase the cooling to the pump.
Change from air cooling to water
cooling (refer to Section 2 for
maximum inlet pressure and cooling
requirements). Increase cooling-
water flow or decrease the water
temperature or do both. Check that
external heat sources (such as
system bakeout heaters) are not
excessive.
Does the rotor rotate freely? If not, the pump bearings may be
damaged. Contact the supplier or
Edwards.
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