Xtreme Power Conversion Corporation
M90S-4S User’s Manual
Page 85
Uninterruptible Power Supply
5.11 EPO Port
This UPS is equipped with an Emergency Power off (EPO) port that can be operated by a remote contact
assigned by the user. Users can set the logic (N.C or N.O) of this EPO function through LCD panel.
Table 5-2 Description of EPO port
EPO logic setting
Position
Description
N.C (Default)
Pin1 & Pin2
EPO activated when Pin1 & Pin2 is open status.
N.O
Pin1 & Pin2
EPO activated when Pin1 & Pin2 is short circuited.
If EPO logic setting is Normal Closed (N.C), EPO is triggered when pin1 and pin2 is open. Otherwise, EPO
logic setting is Normal Opened (N.O). EPO is triggered when pin1 and pin2 is
connected.
5.12 External Maintenance Bypass Signal Port (EMBS)
On the back panel of controller module, there is an external maintenance bypass signal port. The
jumper on the EMBS port is electrically in series with the microswitch under the MBS cover on the UPS.
If the jumper is missing the UPS will be force to static bypass. This port can be connected to external
maintenance bypass switch. If not in use, please connect the terminal port as below for UPS normal
operation.
