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Service Training
Section 2.6
Page 11
2.6.1.4 INSTALLATION OF THE POWER MODULES
The power modules used are of the MOSFET type. MOS transistors react sensitively to static discharges.
Static charges can already arise when walking over a carpet. In the worst case, the body can be charged
up to 35,000 V.
CAUTION: Before working on the power modules, the human body must be discharged by touching earth
(e.g. water pipe).
Handle the power modules carefully to prevent damage to the cooling area and to the connector.
- Clean the underside of the power module in the area of the heat sink of any dust and foreign objects.
- To reduce the heat transfer resistance between the power module and the counterweight,using a spatula,
apply a thin coating of thermal compound WPV10 to the mounting area of the power module
- Position the power module correctly.
- Tighten the M10x35 socket head screws alternately to a torque of 49 Nm.
- Insert the plug.
CAUTION: The M10x35 socket head screws must be tightened to the proper torque to ensure the correct
contact of the power module.
After 30 minutes, tighten alternate M10x35 socket head screws again.