UPS for 400 Vac Grid, Installation Guide, doc. rel. 3.0
11
3.1.
Important Installation Information
The Gamatronic UPS
must be connected a “4
-
wire + Ground” configuration (i.e., 3
N Ground). The voltage displayed on the status screen is the Phase-to-Neutral voltage.
The Neutral line MUST be connected to the UPS on the input and output stages of the UPS. The
UPS will support phase-to-phase loads and phase-to-Neutral loads. The Neutral line must always
remain connected when the UPS is operating. All input, output and dc cables must be armored,
and the armored layer must be connected to the UPS ground connection terminals only.