12 | Troubleshooting
38 | 44
Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en
12
Troubleshooting
DANGER
Live wires.
Risk of electrical shock.
●
Electrical installation work must only be executed by qualified personnel.
CAUTION
Hot surface.
Risk of burns!
●
Prior to any action requiring touching the machine, let the machine cool down first.
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.
●
Rotors inspection or repair
the machine (contact Bus-
ch).
Solid foreign matter has en-
tered the machine.
●
Remove the solid foreign
matter or repair the ma-
chine (contact Busch).
●
Check the inlet screen (IS) at
the suction connection.
The temperature switch (TS)
reached the switch point.
●
Let the machine cool down.
●
See problem “The machine
runs too hot”.
The motor is defective.
●
Replace the motor.
The machine does not reach
the usual pressure on the suc-
tion connection.
Suction or discharge lines too
long or section diameter too
small.
●
Use larger diameter or
shorter lines.
●
Seek advice from your local
Busch representative.
The inlet screen (IS) is partially
clogged.
●
Clean the inlet screen (IS),
see
The machine runs in the wrong
direction.
●
Check the direction of rota-
tion, see Wiring Diagram
Three-Phase Motor.
Internal parts are worn or
damaged.
●
Repair the machine (contact
Busch).
The machine runs very noisily.
Wrong oil quantity or unsuit-
able oil type.
●
Use one of the recommend-
ed oils in the correct quanti-
ty, see
41].
Defective gears, bearings or
coupling element.
●
Repair machine (contact
Busch).
