PowerWalker VFI 20000-40000TAP 3/3 BI, User Manual

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3-20
There is no DC disconnect device within the UPS. A battery disconnect switch is recommended, And may be
required by local codes when batteries are remotely located. The battery disconnect switch should be installed
between the battery and the UPS
External DC input overcurrent protection and disconnect switch for the remote battery location is to be
provided by the user. Table 3-9 lists the maximum rating for continuous-duty rated circuit breakers satisfying the
criteria for both.
Battery voltage is computed at 2 volts per cell. 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. 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.
Table 3-9. Recommended DC input circuit breaker rating
Circuit Breaker Rating
UPS Model Load Derating
Rated battery voltage (DC 432V) Rated battery voltage(DC 384V)
80% Derated
57A 64A
100% Rating
46A 52A
80% Derated
86A 97A
100% Rating
69A 77A
80% Derated
114A 129A
100% Rating
92A 103A
80% Derated
172A 193A
100% Rating
137A 155A
80% Derated
229A 258A
100% Rating 183A
206A
VFI 20000TAP
VFI 30000TAP
VFI 40000TAP
VFI 60000TAP
VFI 80000TAP