28 LRP200000228 Issue A
5.5 Fault finding
A guide to fault conditions and their possible causes is provided in Table 15 to assist you in basic fault
finding.
If you are unable to rectify a fault when you use this guide, call your supplier or your nearest Atlas Copco
Service Centre for advice.
Table 15 – Fault finding
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 back-pressure too high?
Reduce the back-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 Atlas Copco
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 back-pressure too high?
Reduce the back-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 3.11.
Is there a leak in the suction
inlet pipeline?
Leak test the inlet pipeline and seal
any leaks found (see Section 3.12).
The pump is noisy during
operation.
Is the pump operating under
cavitation conditions?
Check that any isolation valves in the
suction inlet pipelines are open.
There may be a loss of sealing liquid.
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 Atlas Copco
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 Atlas Copco for
advice.
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