Name: Eaton 93PS
Brand: Eaton
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7.8 Turning the UPS from the double conversion mode

to the maintenance bypass mode

Only trained personnel who are familiar with the behavior and functions of the

UPS are allowed to operate the internal MBS. A full UPS wiring diagram with

MBS switch is presented in the schematic diagram.

NOTE: The internal MBS and static bypass must be supplied by the same

source.

The MBS has 3 positions: UPS, Test and Bypass. When the MBS is turned to the

Test position, the UPS is already turned to maintenance bypass and it no longer

provides protected input to the load, but enables testing of the UPS internal

functionality.

To turn the UPS to maintenance bypass:

1. Follow the normal start position:

Figure 39: Normal positions of the MBS switches and rectifier disconnect switch

(must be located in the site wiring)

A Static bypass input 1 Maintenance Bypass input switch

(MBS)

B Rectifier input

C Out

2. Do the transfer from the double conversion mode to the bypass mode as

instructed in Section 7.4.3 Transfer from the double conversion mode to the

bypass mode. Remember to verify the transfer before proceeding to the next

step.

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Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide

Eaton 93PS User Manual

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