12
Problem Possible
causes
Remedy
Pump doesn't start
• Power supply interrupted
• Check fuse in the magnetic bearing
controller
• Check plug contacts on the magnetic
bearing controller
• Check supply line
Pump doesn't attain nominal
• Fore-vacuum pressure too high
• Check backing pump function
rotation speed within the set start-
• Leak or too much gas
• Check seals
up time;
• Seek leak and repair
Pump cuts out during operations
• Reduce gas load
• Start-up phase in the magnetic bearing
• Increase the start-up phase
controller set too short
• Thermal overloading caused by
– flow insufficient
• Ensure free flow
– air supply insufficient
• Ensure adequate air supply
– fore-vacuum pressure too high
• Reduce fore-vacuum pressure
– ambient temperature too high
• Reduce ambient temperature
Pump doesn't attain final pressure
• Pump dirty
• Bake out pump
• If seriously contaminated: Request
PFEIFFER Service to clean
• Leak in vacuum chamber,
• Seek leak starting with vacuum cham-
lines or pump
ber
• Repair leak
Unusual operating noises
• Rotor damaged
• Inform PFEIFFER Service of need
for repair
• Splinter shield (if fitted) not
• Check seat of splinter shield
seated firmly
(see Section 3.2.)
• Pump runs in the safety bearings
• Remove the cause; start the pump
again
5. What To Do In Case Of Breakdowns ?
The Magnetic Bearing Controller TCM 1601 contains an
integrated malfunction diagnosis system (error code table).
The malfunction messages are explained in
operating instructions for the TCM 1601, PM 800 478 BN and
their possible causes are listed.
