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Inspection and Startup Checklist
26
3.2 Startup
1. Make certain that all circuit breakers are in the OFF position and that power to the unit is locked
out.
___ 2. Remove the cover of the Main Input Junction Box. Verify proper input power connections to
unit, including equipment grounding conductor.
___ 3. Turn ON the building power to the junction box. Check the phase rotation at the junction box.
Phase rotation should be A, B, C, as indicated.
___ 4. Check and record the input voltages at the junction box:
Volts, Phase A to Phase B = ______________
Volts, Phase B to Phase C = ______________
Volts, Phase C to Phase A = ______________
___ 5. Turn OFF and lock out the building power to the input junction box.
___ 6. Replace the junction box cover.
___ 7. Verify proper input power connections to unit, including equipment grounding conductor and
local grounding electrode conductor.
___ 8. Turn ON the building input power to the unit.
___ 9. Check the phase rotation at the main input breaker. Phase rotation should be A, B, C, left-to-
right.
___ 10. Check and record the input voltage at the main input breaker. Measured voltages should
correspond to the unit’s nameplate input voltage.
Volts, Phase A to Phase B = ______________
Volts, Phase B to Phase C = ______________
Volts, Phase C to Phase A = ______________
___ 11. Turn ON the main input breaker; wait one minute. (If breaker trips OFF, check for wiring
errors including control connections. Contact Liebert Global Services or the location factory
representative for assistance.)
___ 12. Check the phase rotation at the line side terminals (top) of the panelboard main breaker(s)
and any subfeed output circuit breaker(s). The rotation should be A, B, C, left-to-right.
___ 13. Check and record the voltages at the line-side terminals of the output circuit breaker.
Measured voltages should correspond to the unit’s nameplate output voltage (within +4%,-
0%).
Volts, Phase A to Phase B = _______________
Volts, Phase B to Phase C = _______________
Volts, Phase C to Phase A = _______________
Volts, Phase A to Neutral = _______________
Volts, Phase B to Neutral = _______________
Volts, Phase C to Neutral = _______________
If output voltage is incorrect, check for wiring errors, incorrect input voltage, or improper trans-
former tap. Contact Liebert Global Services at 1-800-LIEBERT in the United States or your local
Liebert representative for assistance.
!
WARNING
Startup procedures should be performed only by qualified personnel. Hazardous voltages are
present in the equipment throughout the majority of the start-up procedure. Use proper
safety equipment. proceed with caution.
When opening the main input circuit breaker wait a minimum of one minute before reclosing.
NOTE
Steps 2 through 6 apply to the Main Input Junction Box. If this installation is not provided
with a Main Input Junction Box, proceed to Step 7.