30
Malfunctions
9
Malfunctions
If malfunctions on the pump occur, you will find possible causes and instructions for re-
pair in the following table.
9.1
Rectifying malfunctions
1)
If no Pfeiffer Vacuum display and control unit is available, please contact the Pfeiffer Vacuum Ser-
vice.
Problem
Possible causes
Remedy
Pump does not start; none of the built-in
LEDs on the TC 400 lights up
●
Electrical supply interrupted
Check plug contacts on the power supply
Check supply lines on the power supply
Check the output voltage (24 / 48 V DC) on the
connection "DC out" of the power supply
Check the plug contacts on the TC
●
Operating voltage incorrect
Apply correct operating voltage
Observe the rating plate
●
No operating voltage applied
Apply operating voltage
●
TC 400 defective
Exchange the TC 400
Contact the Pfeiffer Vacuum Service
Pump does not start; green LED on the TC
400 is flashing
●
At operation without control panel:
Pins 1-3, 1-4 or 1-14 are not connected on
the "remote" connection
Connect the pins 1-3, 1-4 or 1-14 on the "re-
mote" connection
Install the mating plug (scope of delivery) to the
"remote" connection.
●
At operation via RS-485: Bridge at Pin 1-
14 prevents control commands
Remove the bridge betwenn pins 1 and 14 from
the "remote" connection
Remove the mating plug from the "remote" con-
nection.
●
At operation via RS-485 (without mating
plug): Parameters of the electronic drive
unit not set
Set parameters
[P: 010]
and
[P: 023]
"ON" via
interface RS-485.
Please refer to operating instructions of the
electronic drive unit.
●
Voltage drop in the cable too high
Use a suitable cable
Pump does not attain the final rotational
speed within the specified run-up time
●
Fore-vacuum pressure too high
Ensure function and suitability of the backing
pump
●
Leak
Perform leak detection
Check sealings and flange fastenings
Eliminate leaks
●
Gas throughput too high
Reduce process gas supply
●
Rotor runs hard, bearing defective
Check the bearing for noises
Contact the Pfeiffer Vacuum Service
●
Setpoint for run-up time to low
Extend the run-up time via DCU, HPU or PC
●
Thermal overload:
– Lack of air ventilation
– Water flow too low
– Fore-vacuum pressure too high
– Ambient temperature too high
Reduce thermal loads
– Ensure adequate cooling
– Ensure the cooling water flow
– Lower the fore-vacuum pressure
– Adjust ambient conditions
Pump does not attain the ultimate pres-
sure
●
Pump is dirty
Bake out the pump
Cleaning in case of heavy contamination
– Contact the Pfeiffer Vacuum Service
●
Vacuum chamber, pipes or pump are
leaky
Leak detection starting from the vacuum cham-
ber
Eliminate leaks
Unusual noises during operation
●
Bearing damage
Contact the Pfeiffer Vacuum Service
●
Rotor damage
Contact the Pfeiffer Vacuum Service
●
Splinter shield or protective screen are
loose
Correct the seat of the splinter shield or the pro-
tective screen
Observe the installation notes
Red LED on the TC 400 is on
●
Collective fault
Reset by switching the mains OFF/ON
Reset via pin 13 on the "REMOTE" connection
Differentiated malfunction display is possible via
RS-485
1)
Contact the Pfeiffer Vacuum Service
