Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 260)

5-18
Component Definition and Maintenance
7000A-RM001A-EN-P – January 2011 7000 “A” Frame
Checking Clamping Pressure
Periodically, the clamping force in the PowerCage should be inspected.
Ensure there is no power to the equipment.
A T T E N T I O N A T T E N T I O N To prevent electrical shock, ensure the main
power has been disconnected 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.
Clamp Bar
Calibration Nut - DO NOT ADJUST Indicating Washer
Adjusting Nut
Disc Springs
Pressure Pad
Figure 5.15 – Clamp Head Illustration
If proper force (as designated on the clamp head block) is applied to the
clamping assembly, the indicating washer should just be able to rotate
with fingertip touch. The indicating washer should not rotate freely.
Some force will need to be applied with your fingertips.
Clamping Pressure Adjustment
1.
Ensure that all power to the drive is off.
2.
Do not loosen the adjustment nut. If the clamping pressure is let off,
the assembly procedure must be carried out to ensure uniform
pressure on the thyristors.
3.
Tighten with a 21-mm wrench on the adjustment nut (upward motion)
until the indicating washer can be turned by fingers with some
resistance. IT SHOULD NOT SPIN FREELY
.