26
Eaton 93PM UPS 480V Three-Wire – 100 kW Frame Installation and Operation Manual 164000227—Rev 07
•
The tie cabinet must contain Module Output Breakers (MOBs) with dual auxiliary contacts for control of
the system. Without dual auxiliary MOBs, UPMs are not allowed to go to bypass individually during
servicing. All UPMs will go to bypass instead of the UPM needing service, decreasing critical load
protection.
•
External parallel system wiring length should be in accordance with
, to ensure approximately
equal current sharing when in bypass mode.
Figure 11. 93PM External Parallel Wire Length
NOTE
Required parallel system wiring 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
1B = 2B = 3B = 4B
NOTE
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%.
Bypass Input to UPS Units
UPS 1
Battery
UPS 2
UPS 3
UPS 4
Output from UPS Units
Battery
Battery
Battery
1A
2A
3A
4A
1B
2B
3B
4B
For external wiring recommendations, including the minimum AWG size of external wiring, see
or
. Wire sizes listed are for copper wiring only.
Summary of Contents for 93PM Series
Page 4: ......
Page 138: ...16400022707 164000227 07 ...
