UPS for 208 Vac Grid, Installation Guide, doc. rel. 3.0
26
Figure 8: Recommended clearance around the UPS
3.3.3.
Electrical Site Preparation
Perform the following procedures before connecting any external cables to the UPS.
To perform the electrical site preparation procedure:
1.
5 (Circuit Breaker Selectivity - in this
Installation Guide
).
The chapter includes considerations regarding the size of the external circuit breakers on the
rectifier input and bypass input lines.
2.
Verify that circuit breakers on the electrical panel that supplies the UPS are compliant
with local and national codes and Gamatronic system specifications.
3.
Verify that the input and output power cable connections, ground, and neutral lines
comply with local and national codes and are appropriate for the circuit breakers
protecting them.
4.
Measure the ac input voltage.
Phase-to-phase voltage (measured between L1-L2, L2-L3, and L3-L1) should be 208 Vac ±10
%. Phase-to-neutral voltage (measured at L1, L2, and L3) should be 120 Vac, ±10 %.
5.
Verify that voltage between neutral and ground is between 0 and 2 Vac. (if not there
may be an issue with the grounding).
6.
Check the dc voltage at the switch of the battery cable. Measure the voltage between
the “plus” side and battery Midpoint, and between the “minus” side and battery
Midpoint.
Verify that the readings you get are at least +192 V and -192 V (about 8 % below nominal
battery voltage)
