Pump is running and a warning occurs: yellow LED
Message Symptom Cause Remedy
Maintenance The landing bearings need
to be replaced.
Landing bearing counter
reaches the warning set-
point.
1. Contact our service center.
Internal com-
munication
The pump cannot start. Internal communication fault 1. Turn off the mains power, then turn
the pump back on.
If the fault occurs again, contact our
service center.
The pump runs but performance is inadequate
Symptom Cause Remedy
The pump does not
reach the selected
speed.
Leaks on the
pumping line
1. Close the isolation valve on the vacuum chamber.
2. Restart the pump. If the selected speed is reached, the leak is in the vac-
uum chamber.
Isolation valve at
pump exhaust re-
mains closed.
This is the case when the V1 isolation valve control is the customer’s re-
sponsibility = valve is controlled with ‘Start’ contact.
1. Check that the valve opens by sending a ‘Start’ order. If the valve does not
open, check the valve electrical wiring and the coil status.
2. With an ohmmeter, check that the ‘Start’ contact on the electronic drive
unit closes when the valve is disconnected. Otherwise, contact our service
center.
Defective fore
vacuum
1. Connect a gauge at the pump inlet and measure the ultimate pressure: it
must be ≤ 1 · 10
-1
hPa.
Air inlet solenoid
valve problem
1. Check the 'Venting' output voltage (0 V) when the electronic drive unit is
on and the valve is disconnected.
2. Check the correct operation of the air inlet valve (NC). If the output contact
is defective, contact our service center.
Leaks on the air
inlet solenoid
valve
1. Replace the solenoid valve with a blanking plate: caution, the pump is no
longer secure in this configuration!
2. Start the pump by sending a ‘Start’ order. If the pump reaches a speed
< 10000 min
-1
: stop the pump immediately and change the valve other-
wise, contact our service center.
Malfunctions
50/60
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