B800-00-880 Issue A
Page 60 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.4 Clean the external surfaces of the pump
Do not attempt to clean any parts of the pump other than external surfaces. Do not disassemble the pump or
remove the electronic controller. Use of solvents may damage internal pump components.
If the nEXT pump is contaminated inside, it may not be possible to achieve the specified ultimate vacuum or pump-
down time may increase. The pump should be returned to an Edwards Service Centre where the pump will be
dismantled and cleaned.
You can use any organic solvent to clean the external surfaces of your pump. We recommend that you use 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
Do not remove the controller from the pump else you may cause damage to the controller.
Refer to Table 25 for the possible causes of faults and the recommended actions to rectify faults.
Clean the external surfaces of the pump in a well-ventilated location. When you use cleaning
solutions and solvents to clean the pump, observe all precautions specified by the manufacturer.
Avoid inhalation of any particulates that may be present in the pump.
Table 25 - Fault finding
Symptom Check Action
The Controller 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 red alarm 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 your 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 red alarm 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.
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