28
Malfunctions
9
Malfunctions
Malfunctions on the pumping station are usually caused by faults on individual compo-
nents. Faults are indicated by the LEDs at the electronic drive unit of the turbopump. Al-
ternatively, a fault code can also be output at the display and control unit DCU.
9.1
Rectifying malfunctions
●
Please refer to the relevant operating manual for troubleshooting at pumping station
components.
●
For additional queries, contact Pfeiffer Vacuum Service.
Problem
Possible causes
Remedy
Pumping station will not start; none of the
integrated LEDs on the electronic drive
unit of the turbopump light up
●
Electrical supply interrupted
Check the plug contacts at the relay box and the
power supply unit.
Check the supply lines of the pumping station.
Check the output voltage (24 V DC) at the "DC
out" terminal of the power supply unit
Check the plug contacts on the power supply
unit
●
Incorrect operating voltage
Apply correct operating voltage
Observe the ratings on the type plate.
●
No operating voltage applied
Apply the correct operating voltage.
●
Electronic drive unit defective
Replace the electronic drive unit.
Contact Pfeiffer Vacuum Service.
Pump not achieving the required ultimate
pressure
●
Condensate in the backing pump
Open the gas ballast valve at the backing pump.
●
Gas ballast valve open
Close the gas ballast valve at the backing pump.
