Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 89)

Rockwell Automation Publication 7000-UM202B-EN-P - June 2014 89
Component Definition and Maintenance Chapter 3
4. Torque the heat sink bolts to 13.5 N•m (10 ft•lb.) starting with the center
heat sink and moving outward alternating left to right.
5. Check the clamp indicating washer.
Checking Clamping Pressure
Periodically inspect the clamping force in the PowerCage. Ensure there is no
power to the equipment.
Figure 81 - Clamp head illustration
Clamping Pressure Adjustment
1. Disconnect all power to the drive.
2. Do not loosen the adjustment nut. If you loosen the clamping pressure,
carry out the assembly procedure to ensure uniform pressure on the
thyristors.
3. Tighten with a 21-mm wrench on the adjustment nut (upward motion)
until you can turn the indicating washer by fingers with some resistance. IT
SHOULD NOT SPIN FREELY.
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. Verify that all circuits are voltage-free using a hot stick or
appropriate voltage-measuring device. Failure to do so may result in injury or
death.
Calibration Nut - DO NOT ADJUST
Clamp Bar Disc Springs
Pressure Pad Face
Indicating Washer
Adjustment Nut
IMPORTANT Never rotate the lock nut located outside the indicating washer at the end of
the threaded rod. The rotation of the outer nut will affect the torque
calibration, which is factory-defined. Only adjust the inside nut (see
Figure 81 ).