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Liebert® EXM™ UPS 20-100kVA, 50/60Hz User Manual |
22
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 and bypass input breaker is required.
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
1
3
N
PH B
MX
AUX
1
C2
C1
3
J24
J24
J23
J23
J23
J25
J24
NC
COM
NO
NC
COM
NO
NC
COM
NO
NC
COM
NO
NC
COM
NO
NC
COM
NO
1 3 5
1 3 5
1 3 5
2 4 6
2 4 6
2 4 6
(ON UPS)
(LOW BATTERY)
(ON BATTERY)
(BYPASS BACKFEED)
(INPUT BACKFEED)
(INPUT ABNORMAL)
Содержание Liebert EXM
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