Eaton 93PM - Turning the UPS from the Double Conversion Mode to the Maintenance Bypass Mode

CAUTION
When the EPO switch is activated, all power to the critical load is lost. Use
this feature only in case of emergency.
Note: The following instructions are for the EPO switch supplied by Eaton
Corporation. If you are using a customer-supplied EPO switch, it may not
activate in the same way. For operating instructions, see the documentation
provided with the switch.
To use the EPO switch:
1. Press the EPO pushbutton switch.
The input, output, and bypass backfeed relays open, the battery breaker or
disconnect is tripped, and the power module is turned off immediately,
without asking for verification.
To restart the UPS after using the EPO pushbutton, reset the EPO switch and
then follow the procedure in Section
7.3.1 or Section 7.3.2 .
WARNING
Do not attempt to restart the system after using the EPO switch until the
conditions for safe start-up have been confirmed.
7.7 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:
Eaton 93PM UPS 30–200 kVA
User's and installation guide
©
Eaton Corporation plc 2017. All rights reserved. Revision: 005 Document ID: P-164000249 103 (126)