Emerson Liebert NXL User Manual

UPS Electrical Installation
16
2.4.4 Inverter Output Breaker (IOB)
For systems that use Inverter Output Breakers (IOB), the controls for the Aux contacts, UVR, Motor
Operator (optional) and voltage sense will go between the Remote breaker and the UPS Output I/O
section. See Figure 8.
IOB must be Listed UL 489 (Molded Case Circuit Breaker) or UL 1066 (Low Voltage AC Power
Circuit Breaker) that are required to be used in UL-listed switchgear or switchboards. The circuit
breaker for 1100kVA systems must have a short-time rating not exceeding 600V at 200K Amperes for
5 cycles; for systems below 1100kVA: 600V at 150K Amperes for 5 cycles.
Figure 8 Remote Output Breaker diagram
See Table 13 for required current ratings.
A
B
C
E
IOB
5A 5A 5A
OUT_LINE_A
OUT_LINE_B
OUT_LINE_C
OUTPUT EMI
FILTER
OUT_LOAD_A
OUT_LOAD_B
OUT_LOAD_C
A
B
C
A
B
C
LINE LOAD
V_CB_A
V_CB_B
V_CB_C
TB1101
TB1102
4 CB2_ C OIL_ RTN
3_CB2_NO (CB CLOSED )
2_ C B2_NC (CB OPEN )
5 CB2_ C OIL
1_ C B2_COM
Inside UPS Cabinet
IOB UVR
Coil
(48VDC)
Circuit Breaker Interface
Board
02-806711 -01
Inside Switchgear
To UPS
Output Customer
Connections
1
2
12 1
2
IOB-1
N
1
1
Fuses should be 5A class CC or J type time delay fuse
OUT_LOAD_N
OUT_LINE_N
N
2
Electrical operator power provided by switchgear vendor
and shall be powered from UPS side of IOB
N
120 -240 Vac
Close
IOB-x
IOB
Electr ical
Operator
120 -240 Vac
(supplied by
sw i tchgear vendor )
5_ M TR_OP_CLOSE
2_ M TR_OP_ENABLE
TB2
TB2-1
TB2-2
TB2-3
TB2-4
2
IOB Status
Contacts

Emerson Liebert NXL Specifications

General

Brand	Emerson
Model	Liebert NXL
Category	UPS
Language	English