Input Isolation Transformer Installation - Powerware 9155 User Manual

Chapter 5
Powerware 9155 UPS (8–15 kVA) User's Guide
®

Input Isolation Transformer Installation

The Powerware 9155 has the following power connections:
2-phase (L1 and L2), neutral, and ground connection for
rectifier/bypass input
2-phase (L1 and L2), neutral, and ground connection for load output
The input isolation transformer output is always 240V (180° phase angle).
If installing an MBM/PDM, the UPS MUST be set up for 240V output only;
otherwise, the "Bypass Not Available" alarm annunciates. Any equipment
connected to the output requiring 208V (120° phase angle) is at risk for
damage when using the Maintenance Bypass switch.
The input isolation transformer cannot be used with a wall-mounted bypass
switch.
Output overcurrent protection and disconnect switch must be provided
by others.
Figure 11 and Figure 12 beginning on page 27 show the oneline diagrams
of the input isolation transformer with the UPS.
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