144 CG-SVX17D-EN
Pre-Start Checkout
This direction may be reversed outside the alternator by interchanging any two of the line wires.
It is this possible interchange of wiring that makes a phase sequence indicator necessary if the
operator is to quickly determine the phase rotation of the motor.
Proper compressor motor electrical phasing can be quickly determined and corrected before
starting the unit. Use a quality instrument, such as the Associated Research Model 45 Phase
Sequence Indicator.
8. Press the Stop key on the Clear Language Display.
9. Open the electrical disconnect or circuit protection switch that provides line power to the line
power terminal block(s) in the starter panel (or to the unitmounted disconnect).
10. Connect the phase sequence indicator leads to the line power terminal block, as follows:
Phase Sea. Lead Ter m i n a l
Black (Phase A) ......................L1
Red (Phase B) ........................L2
Yellow (Phase C) .....................L3
11. Turn power on by closing the unit supply power fused-disconnect switch.
12. Read the phase sequence on the indicator. The “ABC” LED on the face of the phase indicator
will glow if phase is “ABC”.
13. If the “CBA” indicator glows instead, open the unit main power disconnect and switch two line
leads on the line power terminal block(s) (or the unit mounted disconnect). Reclose the main
power disconnect and recheck the phasing.
CAUTION
Equipment Damage!
Do not interchange any load leads that are from the unit contactors or the motor terminals.
14. Reopen the unit disconnect and disconnect the phase indicator.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
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