BUSCH COBRA NC 0600 C, Instruction Manual

Page: 34 / 40

11 | Troubleshooting
34 / 40 0870567092_NC0630C_WCV_A0006_IM_en
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.
A temperature sensor has
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
[
► 24]
.
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) [
► 20] .
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 [ ► 36] .
Defective gears, bearings or
coupling element. • Repair machine (contact
Busch).