Troubleshooting
WARNING
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Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by qualified personnel that knows and observes the following regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or equivalent national accident prevention regulation.
CAUTION
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During operation the surface of the vacuum pump may reach temperatures of more than 70 °C.
Risk of burns!
Let the vacuum pump cool down prior to a required contact or wear heat protection gloves.
Problem
Possible Cause
Remedy
The vacuum pump does not reach the usual
pressure
The drive motor draws a too high current
(compare with initial value after commission-
ing)
Evacuation of the system takes too long
The vacuum system or suction line is not
leak-tight
Check the hose or pipe connections for possi-
ble leak
In case a vacuum relief valve/regulating system
is installed:
The vacuum relief valve/regulating system is
misadjusted or defective
Adjust, repair or replace, respectively
Contaminated oil (the most common cause)
Change the oil
(
Ú
page 9: Maintenance)
No or not enough oil in the reservoir
Top up oil
(
Ú
page 9: Maintenance)
The exhaust filter is partially clogged
Replace the exhaust filter
(
Ú
page 9: Maintenance)
The screen in the suction connection (h) is
partially clogged
Clean the screen
If cleaning is required too frequently install a
filter upstream
In case a filter is installed on the suction
connection (h):
The filter on the suction connection (h) is par-
tially clogged
Clean or replace the inlet air filter, respectively
Partial clogging in the suction, discharge or
pressure line
Remove the clogging
Long suction, discharge or pressure line with
too small diameter
Use larger diameter
The valve disk of the inlet non-return valve is
stuck in closed or partially open position
Disassemble the inlet, clean the screen
and the valve as required and reassemble
The oil tubing is defective or leaking
The oil return line is broken
Tighten the connections
Replace the connections and/or the tubing
(replace with identically dimensioned parts
only)
A shaft seal is leaking
Replace the shaft seal ring (Busch service)
An/The exhaust valve is not properly seated
or stuck in partially open position
Disassemble and reassemble the exhaust
valve(s) (Busch service)
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