11 | Troubleshooting
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0870567093_NC0630C_ACV_A0002_IM_en
11 Troubleshooting
Problem
Possible Cause
Remedy
The machine does not start. The motor is not supplied
with the correct voltage.
• Check the power supply.
The rotors are jammed or
seized.
• Turn the screw rotors
manually from the rotor
access plug (PMR).
• Repair the machine (con-
tact Busch).
Solid foreign matter has
entered the machine.
• Remove the solid foreign
matter or repair the ma-
chine (contact Busch).
• Install an inlet filter if ne-
cessary.
The temperature switch (TS)
reached the switch point.
• Let the machine cool
down.
• See problem “The ma-
chine runs too hot”.
Corrosion in the machine
from remaining condensate.
• Repair the machine.
• Check the process and
follow the recommenda-
tion in case of
Conveying
Condensable Vapours
[
►
22]
.
The motor is defective.
• Replace the motor.
The machine does not reach
the usual pressure on the
suction connection.
Suction or discharge lines
too long or section diameter
too small.
• Use larger diameter or
shorter lines.
• Seek advice from your
local Busch representa-
tive.
Process deposits on the
pumping components
• Flush the machine.
If an inlet screen or an inlet
filter is installed, it can be
partially clogged.
• Clean the inlet screen or
replace the inlet filter
cartridge.
The machine runs in the
wrong direction.
• Check the direction of ro-
tation, see
Wiring Dia-
gram Three-Phase Motor
(Pump Drive) [
►
18]
.
Internal parts are worn or
damaged.
• Repair the machine (con-
tact Busch).
The machine runs very nois-
ily.
Wrong oil quantity or un-
suitable oil type.
• Use one of the recom-
mended oils in the correct
quantity, see
Oil [
►
34]
.
Defective gears, bearings or
coupling element.
• Repair machine (contact
Busch).
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