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SECTION 4
during compressor operation. Check the fluid level by
looking at the sight glass on the separator tube when
the compressor is in the SHUT DOWN MODE (fluid
level may not be visible when operating). In this
condition the sight glass should be completely full.
Add fluid if the level is visible or if no fluid is visible at
all.
4.6
ELECTRICAL PREPARATION
Interior electrical wiring is installed at the factory.
Required customer wiring should be done by a
qualified electrician in compliance with OSHA,
National Electric Code and/or any applicable local
electrical codes applying to isolation switches, fused
disconnects, etc. Refer to Figure 3-2 and Figure 3-4.
Sullair provides a wiring diagram for use by the
installer. An electrical check should be made to
ensure that the first start-up will be successful. The
compressor and drive should be properly grounded/
earthed in accordance with applicable codes,
regulations, and requirements.
Feeder cables should be sized by the customer/
electrical contractor to ensure that the circuit is
balanced and not overloaded by other electrical
equipment. The length of wiring from a suitable
electrical power source is critical because voltage
drops can adversely effect the performance of the
compressor. Cable sizes may vary considerably so
the mains terminals will accept up to 120 mm
awg) (75kw) cable.
Feeder cable connections to incoming terminals L1-
L2-L3 should be tight and clean.
The applied voltage must conform to the motor and
compressor data plate ratings.
A starter hole is provided for an incoming power
connection. If it is necessary to make a hole in the
control box in a different location, care should be
taken to not allow metal shavings to enter the starter
and other electrical components within the box. If
another hole is used, the original hole must be
blocked off with a sealed plug.
Energized internal components are a poten-
tially FATAL SHOCK HAZARD. Disconnect
all power before performing any work on the
compressor's electrical system.
1. Check incoming voltage. The incoming
voltage must match the compressor's wire
rating/specifications.
2. Check motor starter and overload heater
sizes.
3. Check
tightness.
4.7
MOTOR ROTATION
DIRECTION CHECK
Motor rotation check must be done at compressor
start-up after the wiring has been installed. See
Figure 4-4 and Figure 4-5. The compressor can be
damaged if it runs in the wrong direction for more
than a few seconds. Motor rotation can be viewed
2
through the openings in the belt guard. Pull out the
(4/0
EMERGENCY STOP button and press once, quickly
and in succession, the
(STOP) pad. This action will bump start the motor.
When looking at the motor from the compressor unit,
the shaft should turn clockwise for ST400, ST500
and ST700 and counterclockwise for ST1100 and
ST1500. If reverse rotation occurs, disconnect the
power to the starter and exchange any two of the
three power input leads, then re-check rotation. A
"Direction of Rotation" decal is located on the motor
drive housing to show
rotation.
Fan motor rotation should also be checked. It should
rotate counter-clockwise when viewing the fan motor
from the backside of the motor.
02250180-090 R00
USER MANUAL
S
T
™
HOP
EK
WARNING
all
electrical
connections
(START) pad and
proper motor/compressor
for
53
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