Using The Remote Emergency Power-Off Switch; Turning The Ups From The Double Conversion Mode To The Maintenance Bypass Mode - Eaton 91PS UPS 8-40 kW User And Installation Manual

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Eaton 91PS/93PS UPS 8–40 kW

The Select module screen is displayed.

Select the UPM you want to shut down.

In the UPM control screen, select Shut down module.

7.6

A UPS emergency power-off is initiated by the EPO pushbutton switch. In case

of an emergency, you can use this switch to control the UPS output. The EPO

switch de-energizes the critical load and powers down the UPS immediately

without asking for verification. The UPS, including the static bypass switch,

remains off until it is restarted.

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:

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

Do not attempt to restart the system after using the EPO switch until the

conditions for safe start-up have been confirmed.

7.7

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.