Line and load wiring – Powerware 30-160kVA User Manual

Page 17

Powerware 9315 Maintenance Bypass Module 30---160kVA

164201177 Rev. C 041500

The recommended location, for the Maintenance Bypass Module, is as close to the

installed UPS module as possible. Refer to the tables in Appendix A for wire rating

and sizing information
The MBM is packaged in a module similar to the UPS modules (same height,

width, depth). The MBM is designed as a standard line-up-and-match accessory

for the 30---160 KVA rated modules.
Wiring harness assemblies for connecting the UPS module bypass input and

output to the MBP are provided in separate shipping containers, if applicable. The

wiring harness assemblies are passed through the 3-inch wiring feed-through hole

located at the lower right side of the MBM cabinet, for connecting to the UPS input

and output terminals. Refer to Appendix A for UPS module to MBM wiring terminal

locations.

Line up and match connection (cables sold separately by Powerware)

From the UPS to the MBM, the power cables are connected by mechanical

pressure lugs.

From the UPS to the MBM, the control cables are connected to terminal blocks.

Remote connection (cables, lugs, and hardware supplied by others)

All cables are terminated to MBM mechanical pressure lugs.

Line and Load Wiring

The Maintenance Bypass Module provides a means to manually transfer the Critical

load from the UPS module via the UPS Module Bypass to a Maintenance Bypass

Module as may be necessary for shutting down the UPS Module for maintenance

or testing. The proper operation of the transfer is accomplished without interrupting

the load power.
The UPS Module Bypass AC Input and the Maintenance Bypass AC Input must be

from the same or synchronized AC sources. The UPS Module Bypass Input is

connected through the MBP cabinet via an optional Bypass Input Breaker (BIB), if

installed. The Maintenance Bypass Breaker (MBP) is placed in the secondary of the

stepdown transformer (480:208 VAC or 600:208 VAC) or connected directly to the

Maintenance Bypass source if the Isolation Transformer is not required.
UPS Module AC output connects through the MBM cabinet via isolation breaker

MIS. Critical Load terminals are located on the load side of breakers MBP and MIS.
The Critical Load may be transferred in a Make-Before-Break transfer sequence

between the UPS Bypass Source and the Maintenance Bypass source after UPS

output has been transferred from the UPS module and UPS bypass operating

mode. The MBP must first be closed to prevent power interruption and MIS opened

to provide UPS isolation from the Critical Load bus. Refer to the Transfer Sequence

placard affixed to the front of the MBM cabinet.