Vertiv™ |
Liebert® EXM™ UPS 20-100kVA, 50/60Hz User Manual
|
21
3.2.7
Accessory Fuses and Back-Feed Breaker Wiring
Two fuse blocks provide power for the back-feed breakers (standard) and the Alber
®
BDSUi (optional). The fuse
blocks are at the lower right of the I/O panel on the front of the Liebert
®
EXM UPS. See
for fuse-holder
locations.
The back-feed breaker fuse block provides 120V nominal provided from the UPS output (L-N) and the fuse is
rated for 2 amps.
shows the back-feed breaker wiring, located on the bypass static switch assembly.
The Liebert
®
EXM does not include internal back-feed protection. Shunt trip coils of 120V must be installed in the
bypass and rectifier input breakers if the system does not include a Liebert
®
Bypass Cabinet. This is a safety
feature and will prevent the UPS inverter from back-feeding the input source.
The Alber BDSUi fuse block provides 208V nominal from the UPS output (L-L) and the fuse is rated at 8A. The
Alber BDSUi power wiring is shown in SL-25651, the Liebert
®
EXM Battery Cabinet manual.
Figure 10
Accessory fuses
Alber BDSUi
Fuse Block
(optional)
Back-Feed
Breaker Fuse
Block
Summary of Contents for Liebert EXM
Page 1: ...Liebert EXM UPS User Manual 20kVA to 100kVA 208 120V 50 60Hz...
Page 77: ......
