Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 54)

54 Rockwell Automation Publication 7000-UM151E-EN-P - January 2013
Chapter 3 Component Definition and Maintenance
Checking Clamping Pressure
Periodically inspect the clamping force in the PowerCage. Ensure there is no
power to the equipment.
Figure 34 - 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 Indicating washer
Clamp bar
Adjusting nut
Disc springs
Pressure pad
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 35 on page 55 .)