Magnetic Heater Contactors Cont.
CHECKING INPUT VOLTAGE
RESISTANCE CHECK:
The second check, the resistance check must be done with the power to the
machine off. Be sure to shut off the power at the breaker or buildings
disconnect before proceeding.
1) Set the Multi-meter to the Ohms setting. The Ohms setting may be
labeled Ω. Once again, be sure the power to the dryer if off.
2) Place one of the meter probes on a “line” side terminal and the other to
the corresponding “load” side terminal, for example L1&T1, L2&T2,
L3&T3. (See fig 1.)
3) With the probes in place, manually press the actuator on the center
face of the contactor until the contactor closes and a reading appears
on the meter. Repeat across all three phases. (See fig. 2.)
4) The measured value should be between 0.00-0.03 Ohms. A greater
value is indicative of a defective contactor, which should be replaced.
Be sure to shut off the power at the breaker or buildings
disconnect before replacing the contactor.
METER PROBES CONTACTOR CLOSED CORRECT RANGE
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