Testing The Protective Circuitry - Linde E25 Service Training

Service Training
2.6.2.4

TESTING THE PROTECTIVE CIRCUITRY

The contactors are provided with a protective circuitry (diode and resistor) at the coils.
TEST PROCEDURE:
- Disconnect the battery plug.
- Disconnect the connector at the contactor coils.
- Apply a voltage of approx. 4 V to the coils (2 cells of the truck battery or a 4.5 V flat battery) and measure
the current.
- Reverse the poles of the power source.
- The protective circuit is okay if the two test readings are clearly different.
- If both test readings are identical, renew the protective circuitry.
Section 2.6
Page 21