4–17Component Test Procedures
Publication 1336 IMPACT-6.8 – November, 2002
!
ATTENTION: Servicing energized industrial control
equipment can be hazardous. Electrical shock, burns,
or unintentional actuation of controlled industrial
equipment may cause death or serious injury. Follow
the safety-related practices of NFPA 70E, Electrical
Safety for Employee Workplaces, when working on or
near energized equipment. Do not work alone on
energized equipment.
2. At the Control Board, remove the connector at J1.
3. Set your meter to test resistance (range 200k Ohm).
4. Connect the meter leads to the harness connector.
5. If the Main Heat Sink and SCR Heat Sink are at room
temperature, expect a reading of about 100k Ohms – less if the
Main Heat Sink is very warm.
Important: Before you remove connections and wires from the
drive components, mark the connections and wires to
correspond with their component connections and
terminals to prevent incorrect wiring during assembly.
6. If the test indicates a short or an open, break the harness at the
in-line connectors and test the Thermistor and Thermostat
individually.
• Expect the Thermistor to read about 100k Ohms
• Expect the Thermostat to show a short unless the SCR Heat
Sink is very hot. If the Thermostat shows an open circuit, wait
until the SCR Heat Sink is cool and retest.
7. Refer to Replacing a Thermistor in Chapter 5, Part Replacement
Procedures, to replace a failed (open or shorted) Thermistor.
8. Refer to Replacing a Diode, SCR or Thermostat in Chapter 5,
Part Replacement Procedures, to replace a failed (open)
Thermostat.
!
ATTENTION: Replace all guards before applying
power to the drive. Failure to replace guards may result
in death or serious injury.
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