20
Malfunctions
9
Malfunctions
Malfunctions on the pumping station are usually caused by faults on individual
components. Faults are indicated by the LEDs at the electronic drive unit of the tur-
bopump. Alternatively, a fault code can also be output at the display and control
unit DCU.
• Please refer to the relevant operating manual for information about troubles-
hooting individual pump components.
• If no display and control unit is available, please contact the Pfeiffer Vacuum Ser-
vice.
9.1 Rectifying malfunctions
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 stati-
on.
Check the output voltage (24 VDC) at the "DC
out" terminal of the power supply unit
Check the plug contacts on the power supp-
ly 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 final
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.
