Powerware 9390 UPS 100160 kVA User Manual
Page 175
POWER WIRING INSTALLATION NOTES
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INSTALLATION INFORMATION
EATON Powerware
®
9390 UPS (20–80 kVA) Installation and Operation Manual
S 164201603 Rev 2 www.powerware.com
A-27
22.
Battery voltage is computed at 2 volts per cell as defined by Article 480 of the NEC.
Rated battery current is computed at 2 volts per cell.
23.
The battery wiring used between the battery and the UPS should not allow a voltage drop
of more than 1% of nominal DC voltage at rated battery current.
24.
If the conductors used for DC input from the battery cabinets to the UPS are those
provided by the UPS manufacturer, and the UPS and battery cabinets are manufactured by
the same supplier, then it is acceptable if they do not meet the noted minimum conductor
sizes.
25.
Parallel system UPM and system bypass input feeds must come from the same source.
26.
Parallel UPM input wiring size requirements and output wiring size requirements from the
UPMs to the tie cabinet or distribution panel are the same as listed in Table E through
Table J.
27.
All 20 kVA and 30 kVA parallel systems must be wired as for 40 kVA.
28.
If the load requires a neutral, a bypass source neutral must be provided. If the load does
not require a neutral and there is no neutral conductor connected at the bypass input, a
neutral to ground bonding jumper must be installed. Install neutral conductors from the
UPMs to the common point of connection (tie cabinet), and then install a system neutral to
ground bonding jumper. If the recommended installation method cannot be accomplished,
each UPM should have a separate neutral to ground bonding jumper installed in
accordance with Note 7. DO NOT install both a source neutral and a bonding jumper. See
Table S through Table V for system neutral bonding jumper wire sizes. Bonding jumper
must be copper wire.
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HIGH IMPEDANCE GROUND SOURCES - If the source of supply is a high impedance ground (IT) type, the input neutral
conductor must be connected from the source of supply. If there is no output neutral connected to the UPS, the
neutral‐forming transformer kit (PN 103005400) may be used instead of pulling a neutral from the source. If the load requires
a neutral then an input neutral conductor must be pulled into the UPS. In no circumstances shall a neutral to ground bonding
jumper be installed in the UPS.
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DELTA SOURCES (TN‐S) - The Powerware 9390 UPS system can be operated only from a delta supply source that is fully
floating and if the neutral‐forming transformer kit (PN 103005400) is installed in the UPS. The UPS cannot be operated from a
mid‐point or end‐point grounded delta supply source. With this type of supply source, there is no capability to provide an
output neutral. In no circumstances shall a neutral to ground bonding jumper be installed in the UPS.
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In order to change the 9390 batteries from lead acid to NiCAd or from NiCad to lead acid, the internal firmware of the UPS
must be changed by your Eaton Service representative. Failure to do so will cause battery pack damage and loss of battery
backup capability.