Inspection and Startup Checklist
3.2 Startup
! WARNING
Startup procedures should be performed only by qualified personnel. Hazardous voltages are present in the equipment throughout the majority of the
When opening the main input circuit breaker wait a minimum of one minute before reclosing.
1.Make certain that all circuit breakers are in the OFF position and that power to the unit is locked out.
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.
___ 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,
___ 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,
___ 13. Check and record the voltages at the
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
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