Emerson 250 Dry Contacts, EPO Input Dry Contact, Control Status Inputs Dry Contact

UPS Electrical Installation

2.3.1Dry Contacts

Volt-free and isolated contacts are used for interfacing to customer connections external to the NXL unit. These circuits use at least 8mA of current at +24V.

NOTE

All auxiliary cables must be segregated from power circuits (for shielding), must be double- insulated and should be 12-24AWG (2.5-0.2mm2) stranded for maximum runs between 82-164 ft. (25 and 50m) respectively.

NOTE

If connection to more than one module is required, use a separate contact for each module.

EPO Input Dry Contact

Table 1	Remote EPO input
		Terminal		Connects to	Description
Item		Block	Pin	(description of external item)	of interface
			1	REPO Switch, normally open contact	Input, protected
Remote EPO Input			2	REPO Switch, common contact	+24V, 10mA,
		TB0824			current limited
Form C
			3	REPO Switch, normally closed contact, set	Input, protected
				jumper J5: 1-2 to enable, 2-3 to disable

Control Status Inputs Dry Contact

The following inputs can sense either a normally open or normally closed contact.

Table 2	Control or status inputs
		Terminal		Connects to	Description
	Item	Block	Pin	(description of external item)	of interface
			1	On generator switch, closed = on generator	Input, protected
On Generator Input
		TB0816	2	On generator switch, common	+24V, 10mA,
Form C					current limited
			3	On generator switch, closed = not on generator	Input, protected
			1	Key status switch, closed = key removed	Input, protected
Key Status Input		TB0820	2	Key status switch, common	+24V, 10mA,
Form C					current limited
			3	Key status switch, closed = key inserted	Input, protected

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