Malfunctions
Problem
Turbopump will not start up; none
of the built-in LEDs on the elec-
tronic drive unit light up
Turbopump will not start up; green
LED on the electronic drive unit is
flashing
Turbopump fails to reach the nom-
inal rotation speed within the set
run-up time
Turbopump not achieving the ulti-
mate pressure
Unusual noises during operation
136/150
Possible causes
● Current supply interrupt-
ed
● Incorrect operating volt-
age
● No operating voltage
present
● Electronic drive unit de-
fective
● For operation without
control unit: Pins 1-3,
1-4 and 1-14 on the "re-
mote" connection are not
connected
● For operation via
RS-485: The bridge be-
tween pins 1 and 14 in-
hibits control commands
● For operation via
RS-485: Parameters not
set in the electronic drive
unit
● Voltage drop in the cable
is too high
● fore-vacuum pressure
too high
● Leakage on the turbo-
pump
● Gas throughput too high
● Rotor not running
smoothly, defective bear-
ing
● Run-up time setpoint ad-
justed too low
Thermal load due to:
● lack of ventilation
● water flow too low
● fore-vacuum pressure
too high
● ambient temperature too
high
● Turbopump is polluted
● Vacuum chamber, pipes
or turbopump leaking
● Rotor bearing damaged
● Rotor damaged
● Splinter shield or protec-
tive screen loose
Remedy
● Check the plug contacts on the power supply
pack.
● Check the current supply lines.
● Observe the electronic drive unit rating plate.
● Supply the correct operating voltage.
● Supply the correct operating voltage.
● Replace the electronic drive unit.
● Contact Pfeiffer Vacuum Service.
● Connect the connections according to the elec-
tronic drive unit connection diagram.
● Install the mating plug from the shipment.
● Remove the bridge at the "remote" connection.
● Remove the mating plug from the electronic drive
unit.
● Set the parameters [P: 010] and [P: 023] via the
interface RS-485 to 1 = "ON".
● Check the connection cable.
● Use a suitable connection cable.
● Check backup pump compatibility (see technical
data).
● Check that the backup pump is working.
● Carry out leak detection.
● Check seals and flange connections.
● Eliminate leaks.
● Reduce the process gas load.
● Check the turbopump for noise development
● Contact Pfeiffer Vacuum Service.
● Extend the run-up time setpoint [P:700] via a dis-
play and control unit.
● Reduce the thermal load.
─ Ensure adequate air supply.
─ Adjust the cooling water flow.
─ Reduce the fore-vacuum pressure.
─ Adapt the ambient conditions.
● Heat the turbopump if required.
● Have it cleaned.
● Contact Pfeiffer Vacuum Service.
● Carry out leak detection starting from the vacuum
chamber.
● Check seals and flange connections.
● Eliminate leaks in the vacuum system.
● Contact Pfeiffer Vacuum Service.
● Contact Pfeiffer Vacuum Service.
● Check and correct the seat of the splinter shield
or protective screen in the high vacuum flange.
● Follow the installation instructions.