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5.7. Troubleshooting
Error Possible reasons Remedy
Overflow
1. Malfunction of the middle level
switch
2. Malfunction of the highest level
switch
3. Extreme foaming
4. Loose connection to the PLC-
controls
5. Too high vacuum
6. Sealing of the Silica-Gel air filter
not removed
7. Throttle valve completely closed
8. Very high oil reservoir
9. Too high pressure in the return
line/return line clogged
- Check viscosity
- Check middle and highest
level switch
- Reduce incoming flow rate
- Reduce vacuum
- Remove the sealing of the
Silica-Gel air filter
- Open the throttle valve
No oil
1. Closed suction line
2. Clogged solenoid valve
3. Viscosity too high/suction line too
long
4. Malfunction of the lowest level
switch
5. Loose connection to the PLC-
controls
- Open inlet ball valve
- Check suction line
- Check solenoid valve and
clean it, if necessary
- Check lowest level switch,
check connection of lowest
level switch, exchange if
necessary
1. Filter element clogged
- Exchange filter element
Low lubricating
oil
1. Low oil level in the vacuum pump
2. Floater is stuck
3. Loose connection to the PLC-
controls
4. The unit is not in an even position
- Fill oil into the vacuum pump
- Check level switch with floater
- Check connection
- Prevent a sloping position
Motor overload
hydraulic pump
1. Breakdown of one or multiple
phases
2. Breakdown of one or multiple
fuses
3. Incorrect supply voltage
- Check availability of all three
phases
- Check fuses and exchange if
necessary
- Check supply voltage
Motor overload
vacuum pump
1. Breakdown of one or multiple
phases
2. Breakdown of one or multiple
fuses
3. Incorrect supply voltage
4. Too high pressure at the air outlet
side
5. Coalescent elements saturated
- Check availability of all three
phases
- Check fuses and exchange if
necessary
- Check supply voltage
- Check air outlet
- Exchange coalescent element
Wrong direction
or the motor
rotation
1. Wrong polarity of the three-phase
power system
- Change polarity with the three
phase current connector
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