External Protective Device; Figure 23 Ups System With External Maintenance Switch - Emerson Liebert APM 15-90kVA Manual

Figure 23 UPS system with external maintenance switch

Buyout Liebert APM Paralleling Switchboard
* System
UIB
AC Input UIB
4 Wire +GND
See
Note 7
NOTES:
1. Install in accordance with national and local
electrical codes.
2. Input and bypass must share the same single source.
3. A neutral is required from the system AC input source.
A full capacity neutral conductor is recommended.
Grounding conductors are recommended.
4. Bypass and rectifier inputs and output cables must be
run in separate conduits.
5. Control wiring must be run in separate conduits.
NOTE
For parallel system installations, an external bypass rated for the total system load must be
installed.
For parallel systems, Emerson recommends installing bypass load sharing inductors to optimize
current sharing during static bypass operation.
4.2.3

External Protective Device

Refer to 3.2 - External Protective Devices.
Liebert APM #1
UPS Cabinet
Static Bypass
Liebert APM #2
UPS Cabinet
Battery
6. The 90kVA frame has a capacity of up to six
Flex Power assemblies and the 45kVA frame has a
capacity of up to three Flex Power assemblies.
7. Paralleling switchboard requires shunt trip UIB breakers
with 120V coils.
8. See drawings UAM01080B, UAM01080C, UAM01080D,
UAM01080E and UAM01080F. Refer to the following
battery cabinet control wiring drawings:
UAM04000
UAM4001A,B
UAM4002A,B D)
39
Parallel System and LBS System Installation
MBB
Opt. K
MOB1
Output
Busbar
MOB2
Output
Busbar
Field-Supplied Wiring
* External overcurrent protection by others
LEGEND
UIB - UPS Input Breaker
MOB - Module Output Breaker
MIB - Maintenance Isolation Breaker
MBB - Maintenance Bypass Breaker
UAM01060A
Rev. 0
AC Output
4-Wire+GND
MIB
® ™
Liebert APM