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Liebert® EXM™ UPS 20-100kVA, 50/60Hz User Manual |
24
Figure 12
Ground and neutral busbar connections—20-100kVA frame busbars
3.2.9
Protective Devices
For safety, it is necessary to install circuit breakers in the input AC supply external to the UPS system. Given that
every installation has its own characteristics, this section provides guidelines for qualified installation engineers
with knowledge of operating practices, regulatory standards and the equipment to be installed.
UPS Rectifier and Bypass Input Supply
Protection from excessive overcurrents and short circuits in power supply input
External overcurrent protection for the AC output circuit is to be provided. See
7.3 - UPS Electrical Characteristics
and
for recommended breaker ratings.
Overcurrent protection for the battery circuit must be provided by the customer when using an optional External Battery
Cabinet.
•
Dual Input Single Source—When wiring the UPS with dual inputs but with a single input source, the Rectifier input and the
Bypass input must be protected separately. Size the breakers according to the input currents shown in
System Output
When using an external distribution panel for load distribution, the output neutral and input neutral must be
separated at the input to the UPS.
NOTE
For single or dual input, a 120V shunt trip coil(s) is required when a breaker is supplied by the customer. See
See
Detail A
Neutral
Ground
2.5" (64mm)
2 Places
2.5" (64mm)
1.75" (44mm)
FRONT VIEW
Door Removed
DETAIL A
23.6" (600mm)
1.75" (44mm)
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