1.1.1 Pre-installation
Pre-Installation Considerations
•
Modules contained in spare part kits may come from different manufacturers than original parts, but are compatible.
•
Ensure that the environment is free of airborne dust and contaminants that can accumulate on the thermal compound.
•
To avoid a premature IGBT failure, use thermal grease to create a proper thermal interface between the IGBT modules and
the heatsink.
Refer to the product service manual for disassembly/reassembly procedures.
NOTICE
Follow proper ESD precautions to prevent damage to sensitive components
1.1.2 Installation Procedure
1.
Clean the heat sink with a clean cloth and a solvent or alcohol solution before installing the IGBT module.
2.
Apply thermal grease to the bottom of the IGBT module.
•
Thermal grease may separate inside the packet. Apply light pressure to the outside of the packet for one minute
to mix contents that may have settled.
•
Apply a layer of grease to the bottom of the module. Excess grease around the module is not a problem.
3.
Place the IGBT module in position and screw hand-tight using the mounting screws provided with the spare part kit. Wait
one minute before torquing the screws.
4.
Slowly tighten the screws, in the order shown in
Illustration 1.1
, to 50% of the torque value provided in
Table 1.1
(maximum 20 revolutions per minute).
5.
Continue to slowly tighten the mounting screws to 100% of the torque value (maximum 5 revolutions per minute).
Illustration 1.1 Torque Pattern
Bus bar connection torque
Mounting torque
Tightening order
44 in-lb (5 Nm)
44 in-lb (5 Nm)
Hand tight: 1-2-3-4
Full torque: 4-3-2-1
Table 1.1 Torque Instructions
Installation Instructions
VLT
®
FC Series
Spare Brake IGBT
1