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
The operating liquid is too warm
(the characteristic curves are based on 15 °C
warm water as operating liquid, with higher
temperatures the achieved pressure and the
flow rate deteriorate)
Reduce the temperature of the operating liq-
uid
The mechanical seal (433.0) leaks
Replace the mechanical seal (433.0)
Gas or liquid channels are blocked
Dismantle and clean the vacuum pump
In case a screen is installed in the suction
connection (a):
The screen in the suction connection (a) is
partially clogged
Clean the screen
If cleaning is required too frequently install a
filter upstream
The filter on the suction connection (a) 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
Internal parts are worn or damaged
Repair the vacuum pump (Busch service)
The gas conveyed by the vacuum pump smells
displeasing
Process components evaporating under vac-
uum
Check the process, if applicable
The vacuum pump does not start
The drive motor is not supplied with the cor-
rect voltage or is overloaded
Supply the drive motor with the correct volt-
age
The drive motor starter overload protection is
too small or trip level is too low
Compare the trip level of the drive motor
starter overload protection with the data on
the nameplate, correct if necessary
One of the fuses has blown
Check the fuses
The connection cable is too small or too long
causing a voltage drop at the vacuum pump
Use sufficiently dimensioned cable
LA 0053-1111 A, LB 0063-1011 A
Troubleshooting
0870150638 / 091222
page 13
Summary of Contents for DOLPHIN LA 0053-0143 A
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