Powerware 650825 kVA User Manual

UPS INSTALLATION PLAN AND UNPACKING

EATON Powerware

®

 9395 UPS (650–825 kVA) Installation and Operation Manual  

S

  164201725 Rev 2 www.powerware.com

3−18

There is no manual DC disconnect device within the UPS.

A battery disconnect switch is required for battery systems and may also be required
by NEC or local codes. The battery disconnect switch should be installed between the
battery and the UPS.

External DC input overcurrent protection and disconnect switch is to be provided by
the customer. Table 3-17 and Table 3-18 list the maximum ratings for continuous-duty
rated circuit breakers satisfying the criteria for both. Recommended disconnect size is
based on a maximum full load discharge time less than 3 hours. For longer discharge
times a larger disconnect may be required.

Table 3-17. Recommended DC Input Battery Disconnect Ratings – Common Battery

UPS Model

Input Rating

400V

480V

Powerware 9395−825/650

1600A

1600A

Powerware 9395−825/750

2000A

2000A

Powerware 9395−825/825

2000A

2000A

Table 3-18. Recommended DC Input Battery Disconnect Ratings – Separate Battery

UPS Model

Input Rating

(each UPM)

400V

480V

Powerware 9395−825/650

700A

700A

Powerware 9395−825/750

Powerware 9395−825/825

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.

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.