24
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.
9.1 Rectifying malfunctions
• Please refer to the relevant operating manual for information about troubles-
hooting individual pump 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
Ö
Check the plug contacts at the relay box and
the power supply unit.
Ö
Check the supply lines of the pumping stati-
on.
Ö
Check the output voltage (24 VDC) at the "DC
out" terminal of the power supply unit
Ö
Check the plug contacts on the power supp-
ly unit
• Incorrect operating voltage
Ö
Apply correct operating voltage
Ö
Observe the ratings on the type plate.
• No operating voltage applied
Ö
Apply the correct operating voltage.
• Electronic drive unit defective
Ö
Replace the electronic drive unit.
Ö
Contact Pfeiffer Vacuum Service.
Pump not achieving the required final
pressure
• Condensate in the backing pump
Ö
Open the gas ballast valve at the backing
pump.
• Gas ballast valve open
Ö
Close the gas ballast valve at the backing
pump.
