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 side channel
blower
Use sufficiently dimensioned cable
The side channel blower or the drive motor is
blocked
Make sure the drive motor is disconnected
from the power supply
Remove the fan cover
Try to turn the drive motor with the side
channel blower by hand
If the side channel blower is blocked:
Repair the side channel blower (Busch service)
The drive motor is defective
Replace the drive motor (Busch service)
The side channel blower is blocked
Solid foreign matter has entered the side
channel blower
Repair the side channel blower (Busch service)
Make sure the suction line is equipped with a
screen
If necessary additionally provide a filter
Corrosion in the side channel blower from re-
maining condensate
Repair the side channel blower (Busch service)
Check the process
The side channel blower was run in the wrong
direction
Repair the side channel blower (Busch service)
When connecting the side channel blower
make sure the side channel blower will run in
the correct direction (
Ú
page 6: Installation)
The side channel blower starts, but labours or
runs noisily or rattles
The drive motor draws a too high current
(compare with initial value after commission-
ing)
Loose connection(s) in the drive motor termi-
nal box
Not all drive motor coils are properly con-
nected
The drive motor operates on two phases only
Check the proper connection of the wires
against the connection diagram
Tighten or replace loose connections
The side channel blower runs in the wrong di-
rection
Verification and rectification
Ú
page 5: Instal-
lation and Commissioning
Foreign objects in the side channel blower
Stuck bearings
Repair the side channel blower (Busch service)
The side channel blower runs very noisily
Defective bearings
Repair the side channel blower (Busch service)
The side channel blower runs very hot
Insufficient air ventilation
Make sure that the cooling of the side channel
blower is not impeded by dust/dirt
Clean the fan cowling, the fan wheel, the ven-
tilation grille and the cooling fins
Install the side channel blower in a narrow
space only if sufficient ventilation is ensured
Ambient temperature too high
Observe the permitted ambient temperatures
Temperature of the inlet gas too high
Observe the permitted temperatures for the
inlet gas
Insufficient gas transfer
Check the process conditions
Mains frequency or voltage outside tolerance
range
Provide a more stable power supply
Partial clogging of filters or screens
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
Troubleshooting
SB 0050 - 1400 D0/D2
ATEX-Version
0870145236
/
181122
page 11
