Main Contact Conduction Control
While the contactor is unplugged, check whether there is energy at the contact outputs
no. 2, 4 and 6. Each of the contacts must have energy. Then switch the device to
"OFF" mode with K1, deactivate the contactor and take the same measurement. None
of the contacts must have energy. If these conditions are not met, the contactor is
broken and must be replaced.
Coil Resistance Measurement
If the short-circuit value is read when the power of device is turned off and the
resistance is measured between the terminals A1 and A2 of the contactor, the
contactor must be replaced. Under normal conditions, a value above 400 should
be displayed. The short-circuit in the coil terminals may cause the glass Circuit
Breaker of the mainboard to blow and deform the mainboard circuit.
Visual inspection
If there is deformation like burning in the contacts of the contactor, replace it
together with the damaged cables.
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