Emerson VILTER VSS Installation, Operation And Service Manual page 110

Single screw bare shaft compressor
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Section 6 • Troubleshooting
Table 6-3. Troubleshooting Guide - General Problems & Solutions (3 of 3)
Problem
High Amp Draw
Vibration
Excessive Motor Backspin
6 – 8
VSS/VSR/VSM/VSH/VSSH Compressor • Installation, Operation and Service Manual • Emerson • 35391S
Check calibration at full load.
Check CT ratio entered in Vission 20/20.
Check slide valve calibration, especially volume slide.
Check that unit is leveled and secured to mounting pad or floor.
Check supported pipes (i.e. suction and discharge pipe) and make
sure they are adequately supported.
Check for loose bolts and nuts.
Check condition of compressor and motor (i.e. alignments)
If there is more than normal motor backspin at shutdown, check suc-
tion check valve for proper operation.
Solution

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