Powerware 9155 Chapter 5 Input Isolation Transformer Installation

Chapter 5 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

C A U T I O N

￿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.

Powerware® 9155 UPS (8–15 kVA) User’s Guide S 164201553 Rev D www.powerware.com 21