UPS Electrical Installation
9
2.3.1 Dry 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.
EPO Input Dry Contact
Control Status Inputs Dry Contact
The following inputs can sense either a normally open or normally closed contact.
NOTE
All auxiliary cables must be segregated from power circuits (for shielding), must be double-
insulated and should be 12-24AWG (2.5-0.2mm
2
) 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.
Table 1 Remote EPO input
Item
Terminal
Block Pin
Connects to
(description of external item)
Description
of interface
Remote EPO Input
Form C
TB0824
1 REPO Switch, normally open contact Input, protected
2 REPO Switch, common contact
+24V, 10mA,
current limited
3
REPO Switch, normally closed contact, set
jumper J5: 1-2 to enable, 2-3 to disable
Input, protected
Table 2 Control or status inputs
Item
Terminal
Block Pin
Connects to
(description of external item)
Description
of interface
On Generator Input
Form C
TB0816
1 On generator switch, closed = on generator Input, protected
2 On generator switch, common
+24V, 10mA,
current limited
3 On generator switch, closed = not on generator Input, protected
Key Status Input
Form C
TB0820
1 Key status switch, closed = key removed Input, protected
2 Key status switch, common
+24V, 10mA,
current limited
3 Key status switch, closed = key inserted Input, protected
