5–29Part Replacement Procedures
Publication 1336 IMPACT-6.8 – November, 2002
7. With the Clamps removed, it is normally possible to separate the
Heat Sink halves enough to remove the SCR and Thermostat, or
the Diode. As an alternative, refer to Chapter 3, Access
Procedures and perform Removing SCR and Diode Heat Sinks.
8. Note the polarity of the Diode or SCR and remove the defective
component.
Installation
Refer to Table 3.A – Fastener Torque Specifications in Chapter 3,
Access Procedures.
1. Route the SCR leads (from the Common Bus Precharge Board) in
through the hole in the HV Guard, and connect the leads to the
SCR.
2. Apply two drops of silicone oil to each side or face of the new
Diode or SCR.
3. Clean any dirt off of the original heat sink mounting surfaces.
4. Install the new Diode or SCR, with the same polarity as the
original component, in the heat sink (refer to Figure 5.15).
Important: A pin on the Heat Sink centers the SCR. Verify that the
SCR is centered on the pin. When properly centered he
SCR should rotate freely about the pin.
5. Tighten the clamp nuts, while holding the heat sinks flat against
the precharge back-up plate.
6. If the heat sinks were removed from the Inverter Assembly,
re-install. Refer to Removing SCR and Diode Heat Sinks, in
Chapter 3, Access Procedures.
7. Route the Thermostat harness out through the hole in the HV
Guard and connect to the harness coming from the Thermistor
and Control Board.
8. Reinstall the four screws that hold the HV Guard in place.
!
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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