Troubleshooting

DANGER

danger

Live wires.

Risk of electrical shock.

  1. Electrical installation work must only be executed by qualified personnel.

CAUTION

caution

Hot surface.

Risk of burns!

  1. Before doing anything that requires touching the machine, let it cool down first.

Problem

Possible Cause

Remedy

The machine does not start.

The motor is not supplied with the correct voltage.
  1. Check the power supply.

The rotors are jammed or seized.
  1. Rotors inspection or repair the machine (contact Busch).

Solid foreign matter has entered the machine.
  1. Remove the solid foreign matter or repair the machine (contact Busch).
  2. Check the inlet screen (IS) at the suction connection.

The temperature switch (TS) reached the switch point.
  1. Let the machine cool down.
  2. See problem “The machine runs too hot”.

The motor is defective.
  1. 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.
  1. Use larger diameter or shorter lines.
  2. Seek advice from your local Busch representative.

The inlet screen (IS) is partially clogged.
  1. Clean the inlet screen (IS), see Cleaning the Inlet Screen.

The machine runs in the wrong direction.
  1. Check the direction of rotation, see Wiring Diagram Three-Phase Motor.

Internal parts are worn or damaged.
  1. Repair the machine (contact Busch).

The machine runs very noisily.

Wrong oil quantity or unsuitable oil type.
  1. Use one of the recommended oils in the correct quantity, see Oil.

Defective gears, bearings or coupling element.
  1. Repair machine (contact Busch).

The machine runs too hot.

Insufficient cooling.
  1. Make sure to comply with the cooling water requirements, see Cooling Water Connection.

Ambient temperature too high.
  1. Observe the permitted ambient temperature, see Technical Data.

Temperature of the process gases at the inlet too high.
  1. Observe the permitted gas inlet temperature, see Technical Data.

Oil level too low.
  1. Top up oil.

The oil is black.

Oil change intervals are too long.
  1. Drain the oil and fill in new oil, see Oil Change.

The machine runs too hot.
  1. See problem "The machine runs too hot".

For resolution of problems not listed in the troubleshooting table, please contact your Busch representative.