Emerson Liebert eXM - Figure 11 Dual Input Back-Feed Breaker Wiring When Bypass Distribution Cabinet Not Used

Electrical Connections—UPS
23 Liebert
®
eXM
™
Figure 11 Dual input back-feed breaker wiring when bypass distribution cabinet not used
NOTE
Shunt trips are required in upstream breakers to allow back-feed protection to function
properly.
Shunt trip of the upstream rectifier input breaker is optional.
1. Auxiliary contacts not needed for backfeed breaker operation.
2. A 120V shunt trip coil is required for proper operation.
Dual Input Control Wiring
Upstream Bypass
Input Breaker
Upstream System
Input Breaker
Single Input Control Wiring
Backfeed Breaker
Fuse Block (FH1)
Backfeed Breaker
Fuse Block (FH1)
Upstream Rectifier
Input Breaker
UAM04030
Rev. 3
MX
MX
AUX
AUX
1
C2
C2
C1
C1
1
3
3
N
PH B
13
N
PH B
MX
AUX
1
C2
C1
3
J24
J24
J23
J23
BFP_O
J23
J25
J24
BFP_S
BFP_C
INV_O
INV_S
INV_C
MAIN_O
MAIN_S
MAIN_C
MFP_O
MFP_S
MFP_C
RESV_O
RESV_S
RESV_C
RESV_O
RESV_S
RESV_C
1
3
5
1
3
5
1
3
5
24
6
24
6
24
6