Cause Blocked rotors
Remedy When the pump gets hot and if debris may have been ingested or condensed within the
pump, the rotors may be stuck. Let the pump cool down to room temperature, then
restart, once operational run the pump with the gas ballast applied for at least 2 hours to
try and clear any internal blockages. If the problem persists is recommended to contact
supplier for further information and advice.
Fault
The pumping speed is poor or pump down time is too long
Cause The pipelines connections are too small in diameter.
Remedy Make sure that the pipework has sufcient conductance (user's responsibility) and the
pump performance is not compromised.
Cause There is a leak in the system.
Remedy Leak test the pump system in accordance with the requirements specied in Table:
Performance data.
Cause The motor controller is current limiting the supply.
Remedy Adjust the inlet pressure/ow until the pump performance recovers.
Cause The pump chamber is too big.
Remedy Make sure that the chamber size does not exceed the limits specied in Table:
Mechanical data.
9.1 Alarm indicator codes
When the fail condition becomes active, the red alarm indicator shows a
ashing sequence.
▪
If the error light is on continuously, this indicates a problem has been
found with the embedded software. In this case, switch the power
supply on and off.
▪
If the indication is not cleared, a software download may be required.
In this case, contact us or the supplier.
▪
If the alarm indicator is ashing, identify the error ash code. Refer to
Table: Flashing error codes.
Note:
There is a sufcient off period between each subsequent cycle
repetition to mark the start of a new ash sequence. The duration of a
long ash (L) is equal to 3 times the duration of a short ash (0.5 s).
Table 21
Flashing error codes
Error ash
position
Error ash
sequence
Comment Actions
0 s-s-s-s-s-s Overload timeout Check if the pump is not under constant high pressure
or the inlet or outlet is not blocked.
1 L-s-s-s-s-s Controller software error Switch the power to the pump off and on and see
whether the error code appears again. If it does,
contact us or the supplier.
300902516_002 - 10/2020 - © Leybold
52
Fault nding
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