Installing A Remote Epo Switch; Installing Interface Connections; Figure 4-4: Connections Of The Epo Switch; Table 4-1: Remote Epo Wire Terminations - Eaton 93PR User And Installation Manual

4.3. Installing a Remote EPO Switch

A remote EPO switch can be used in an emergency to shut down the UPS and remove power to the critical load from
a location away from where the UPS is installed.
EPO is to be connected to the UPS's top front panel, on connector EPO. Below are the NO and NC connections of the
EPO switch.
EPO connector (front view):
• A Normally open
• B Normally closed

Table 4-1: Remote EPO Wire Terminations

From remote EPO switch
NO
NC

4.4. Installing Interface Connections

93PR UPS contains a total of five (5) signal input connectors for customers which can be used for
giving remote control commands to the UPS. Customer interface connector CN5 can be used forthese purposes. Each
input is a dry relay contact input and requires two wire signaling. None of the inputs are
pre-programmed but need to be separately programmed by qualified service personnel.
When using an external battery system (either the original 93PR battery cabinet or a customer sourced battery cabinet/
rack), external signaling wiring is recommended to be connected.
One (1) general alarm relay output is also on the front panel. This output is either normally open (NO) or normally closed
(NC). Polarity selection is made with wiring connection.
By default, the general alarm relay activates when a system alarm is active, that is, any ALARM condition in the system
is active. Alternatively, it can be activated with any particular event but this must be programmed separately by qualified
service personnel. The alarm relay is designed for signal level (ELV or SELV) voltages only, not for utility use. For higher
signaling circuit voltage requirements, please use Industrial Relay Adapter in Mini-slot.

Figure 4-4: Connections of the EPO Switch

To customer interface Terminal block
EPO in UPS cabinet
3-4
1-2
Eaton 93PR 500 kW UPS
User's and Installation Guide
Remarks
Wire jumper between 3-4 must be
installed for proper function
39