Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 324)

6-20 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” Frame
Clamp Bar
Calibration Nut - DO NOT ADJUST Indicating Washer
Adjusting Nut
Disc Springs
Pressure Pad
Figure 6.18 – 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
.
I M P O R T A N T I M P O R T A N T Never rotate the calibration 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 set. Only
adjust the inside nut. (See Figures 6.18 and 6.19.)