Vertiv | Liebert
®
NXL
™
500-750kVA UPS Installation Manual |
13
2.4.1
Dry Contacts
NOTE
If connection to more than one module is required, use a separate, isolated contact for each
module.
Table 1
UPS input dry contacts
Item
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max Length
Remote EPO
Input Form C
TB082
4
1
REPO Switch, normally open contact
14AWG/
500ft.
(150m)
2
REPO Switch, common contact
3
REPO Switch, normally closed contact, set
jumper
J5: 1-2 to enable, 2-3 to disable
On Generator
Input Form C
TB0816
1
On Generator switch, closed = On Generator
2
On Generator switch, common
3
On Generator switch, closed = Not On
Generator
Table 2
UPS control contacts with battery cabinet or module battery disconnect
Item
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max Length
CAN Bus and
24V Power Supply
TB1154
A
1
Battery Interface Board TB1154-1
18 AWG
1000ft.
(300m)
2
Battery Interface Board TB1154-2
3
Battery Interface Board TB1154-3
4
Battery Interface Board TB1154-4
Table 3
UPS control contacts with global maintenance bypass
Item
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max
Length
Maintenance
Isolation Breaker
(MIB) Form C
TB0811
1
CB aux. contact, closed = CB is closed
14AWG/500
ft.
(150m)
2
CB aux. contact, common
3
CB aux. contact, closed = CB is open
Maintenance
Bypass
Breaker (MBB) Form
C
TB0813
1
CB aux. contact, closed = CB is closed
14AWG/500
ft.
(150m)
2
CB aux. contact, common
3
CB aux. contact, closed = CB is open
Maintenance
Bypass
Enable Form C
TB0821
1
Maintenance Bypass Cabinet,
closed = load not on inverter
14AWG/500
ft.
(150m)
2
Maintenance Bypass Cabinet, common
3
Maintenance Bypass Cabinet, closed = load on
inverter
Remote EPO Input
TB082
5
1
REPO Switch, normally open contact
14AWG/500
ft.
(150m)
2
REPO Switch, common contact
Key Status Input
Form C
TB082
0
1
Key status switch, closed = key removed
14AWG/500
ft.
(150m)
2
Key status switch, common
3
Key status switch, closed = key inserted
