Edwards ATEX 1 EHR, Instruction Manual

Page: 42 / 50

A750-04-880 Issue F
Page 34 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
MAINTENANCE
Table 16 - Fault finding
Symptom Check Action
A drive protection device switches
off your drive after switch-on, or
a torque limiting device in your
drive and transmission system
trips. Has the drive/transmission
overloaded? Reduce the flow rate of sealing liquid to
the pump.
Is the outlet pressure too high? Reduce the outlet pressure.
Is the drive/transmission system
damaged? Inspect and repair or replace as
necessary.
Excessive electrical current is
drawn by your drive and
transmission system during
operation. Are there deposits or particulates
inside the pump? Contact your supplier or Edwards to
arrange for inspection and cleaning of the
pump.
Has the drive/transmission
overloaded? Reduce the flow rate of sealing liquid to
the pump.
Is the outlet pressure too high? Reduce the outlet pressure.
Is the drive/transmission system
damaged? Inspect and repair or replace as
necessary.
Vacuum pumping performance is
poor. Is the sealing liquid supply
inadequate, or is its temperature
too high? Check that the sealing liquid supply is as
specified in
Section 2.6 .
Is the direction of pump rotation
incorrect? Check the direction of pump rotation and
correct as necessary: refer to
Section 3.15 .
Is there a leak in the process inlet
pipeline? Leak test the inlet pipeline and seal any
leaks found (see
Section 3.16 ).
The pump is noisy during
operation. Is the pump operating under
cavitation conditions? Check that any isolation valves in the
process inlet pipelines are open.
There may be a loss of sealing liquid. On
ATEX Category 2 pumps configured for
external seals flush supplies, check for
correct operation of the flow switches in
your seals flush supply pipelines, and on
all ATEX category 2 pumps, check for
correct operation of the temperature
transmitter (if fitted, see
Section 3.1.2 ),
which should have operated to shut down
the pump in these conditions.
Is the flow of sealing liquid to the
pump too high? Check that the sealing liquid supply is as
specified in
Section 2.6 . If necessary,
reduce the flow rate of the sealing liquid
into the pump (see
Section 4.3 ).
Is the pump damaged or in need of
repair? Contact your supplier or Edwards to
arrange for pump inspection.
- - If you have made the checks/actions as
described above and you still cannot
identify the cause of a fault, or if you
cannot rectify a fault, contact your
supplier or Edwards for advice.