8.6 Operation monitoring
8.6.1 Operating mode display via LED
The LED on the electronic drive unit indicates the basic operating conditions. A differentiated malfunc-
tion and warning display is possible only for operation with DCU or HPU.
Display
Activity
Meaning
None
● No adequate power supply
10% active, 1 Hz
● No errors
● Vacuum pump "OFF"
● Vacuum pump stationary
50 % active, 1 Hz
● No errors
● Vacuum pump "OFF"
● Vacuum pump still rotating
90 % active, 1 Hz
● No errors
● Vacuum pump "ON"
● Set rotation speed not reached
100% active
● No errors
● Vacuum pump "ON"
● Target speed reached
50% active, 10, Hz
● Defect
Tbl. 15:
Behavior and meaning of the LED of the electronic drive unit
8.6.2 Temperature monitoring
If the pump temperature becomes too high (> 75 °C), the electronic drive unit reduces the motor rotation
speed to the nominal rotation speed to prevent the vacuum pump from overheating.
After cooling down (< 72 °C), the vacuum pump starts to run at set rotation speed.
8.7 Switching off the vacuum pump
Procedure
1. Allow the vacuum pump to run on for 5 to 10 minutes with the vacuum connection open to allow
any condensate that may be present to be removed from the vacuum pump.
2. If required, switch the vacuum pump off in each pressure range.
3. Disconnect the voltage supply on the power supply pack.
Operation
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