6.3.9 Disconnect Test
The line power disconnect switch is optional. If present, it
is located in the options cabinet.
For the line power disconnect test:
1.
Use an ohmmeter set to read ohms.
2.
Open the disconnect switch.
3.
Measure the resistance across each of the three
phases.
An open circuit (infinite resistance) is a correct reading. A
short circuit (0 Ω) indicates a problem with the switch.
1.
Close the disconnect switch.
2.
Measure the resistance across each of the three
phases.
A short circuit (0 Ω) is a correct reading. An open circuit
(infinite resistance) or high resistance reading indicates a
problem with the switch. Replace the disconnect switch.
6.3.10 Circuit Breaker Test
The circuit breaker is optional. If present, it is located in
the option cabinet.
1.
Use an ohmmeter set to read Ohms.
2.
Open the circuit breaker.
3.
Measure the resistance across each of three
phases.
An open circuit (infinite resistance) is a correct reading. A
short circuit (0 Ω) indicates a problem with the circuit
breaker.
1.
Close the circuit breaker.
2.
Measure the resistance across each of the three
phases.
A short circuit (0 Ω) is a correct reading. An open circuit
(infinite resistance), or high resistance reading indicates a
problem with the circuit breaker.
If there is a problem with any of the phases, replace the
circuit breaker.
6.3.11 Contactor Test
The contactor is optional. If present, it is located in the
option cabinet. The contactor uses a customer-supplied
230 V AC control signal wired to the contactor coil. When
power is applied to the contactor coil, the contactor is
closed. When there is no power, the contact is open.
NOTICE!
Complete testing of the contactor requires an external
230 V AC power supply.
Contactor Test part I
1.
Remove power to the contactor coil.
2.
Use an ohmmeter to measure across each of the
three phases.
An open circuit (infinite resistance) is a correct reading. A
short circuit (0 Ω) indicates a problem with the contactor.
Contactor Test part II
1.
Manually engage the contactor.
2.
With the contactor engaged, measure the
resistance across each of the three phases.
A short circuit (0 Ω) is the proper reading. An open circuit
(infinite resistance) or high resistance reading indicates a
problem with the contactor.
Contactor Coil Test
NOTICE!
230 V AC power is required to test the contactor coil.
1.
Apply power to the coil to energize the
contactor.
2.
Use a voltmeter set to measure AC voltage
between A1 and A2 on TB6.
3.
Measure the resistance across each of the three
phrases.
When power is applied, the contactor energizes and is
engaged. A short circuit (0 Ω) is a correct reading. An open
circuit (infinite resistance) or high resistance reading
indicates a problem with the contactor.
If there is a problem with any of the phases, replace the
contactor.
Test Procedures
Service Manual
76
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
MG94A222
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Summary of Contents for VLT FC 103
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