Eaton 93PM-L Series, Инструкция по установке и эксплуатации

Страница: 47 / 164

Eaton 93PM-L 20 – 60 kW (208V) UPS Installation and Operation Manual P-164000711—Rev 03 35
33..44 EExxtteerrnnaall P Paarraalllleell U UP PS S S Syysstteem m P Poow weerr W Wiirriinngg P Prreeppaarraattiioonn
Read and understand the following notes in addition to the notes in paragraph
3.3 UPS System Power Wiring Preparation while planning and performing the external parallel installation:
• All external parallel UPS rectifier inputs must come from one source and all bypass input feeds must come
from one source.
• All UPSs in the external parallel system must contain the same number of UPMs. Mixed UPS kW ratings
are not permitted.
• External parallel UPS input wiring size recommendations and output wiring size recommendations from
the UPSs to the panelboard are the same as listed in
Table 9 through Table 12 .
• The wall mounted tie panelboard must contain Module Output Breakers (MOBs) with dual auxiliary
contacts for control of the system and to maintain critical load protection. With dual auxiliary MOBs, one
UPM can be bypassed while the remaining UPMs support the load as long as the remaining UPMs have
the capacity to do so.
Figure 16. 93PM-L External Parallel Wire Length
Bypass Input to
UPS Units
1A
2A
3A
4A
UPS 1
UPS 2
UPS 3
UPS 4
Battery
Battery
Battery
Battery
1B
2B
3B
4B
Output from
UPS Units
NOTE 1 Required parallel system wire length must be equal to ensure approximately equal
current sharing when in Bypass mode. For proper operation the following must be true:
1A = 2A = 3A = 4A and 1B = 2B = 3B = 4B
NOTE 2 Any difference in wire length will result in decreased capacity of the UPS system while
on bypass. For example, a 10% difference between the longest and shortest wire
lengths will result in a decrease in bypass capacity of 10%.
For external wiring recommendations, including the minimum AWG size of external wiring, see Table 9 through
Table 12 . Wire sizes listed are for copper wiring only. For external wiring, use only 75°C copper wire.
UPS Installation Plan and Unpacking