SN55, SN55S, SN55V, SN75, SN75S, SN75V User Manual
4: Installation
02250247-571 R04
Subject to EAR, ECCN EAR99 and related export control restrictions.
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site the compressor unit, the shaft should be turning
clockwise. If the reversed rotation is noted, disconnect
the power to the starter and exchange any two of the
three power input leads, then re-check rotation. A "Direc-
tion of Rotation" decal is located on the motor drive hous-
ing to show proper motor/compressor rotation. An
alternative to this procedure is to set the STS monitor to
display the P1 separator/sump tank pressure. Pull out the
EMERGENCY STOP
button and press once, quickly and
in succession, the Start and Stop buttons. This action will
bump start the motor for a very short time. If motor rota-
tion is correct there will be immediate pressure shown. If
no pressure is present, reverse rotation is occurring. Dis-
connect the power to the starter and exchange any two of
the three power input leads. Recheck rotation as outlined
above.
Fan motor rotation should also be checked. It should
rotate counter-clockwise when viewing the fan motor
from the backside of the motor.
Figure 4-2: Motor rotation direction
A. Fan motor rotation direction
B. Main motor rotation direction
