Emerson Liebert NXL series, Руководство по эксплуатации и обслуживанию, Страница: 37 / 96

Liebert NXL UPS Operation and Maintenance Manual 250-300-400-800kVA
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Use the Battery Time screen at the UPS modules to monitor the present battery voltage
compared to the shutdown value. The time the battery can sustain the load depends on the
size of the load and the size and condition of the battery plant.
Alarm messages that indicate battery status are Battery Discharge, Low Battery and
Battery Shutdown.
The voltage limits for these alarms are displayed on the UPS module Alarm Limit Settings
screen. These limits were selected for your installation by Liebert Services during initial
start-up. The battery block in the UPS module Monitor/Mimic Display indicates Charge or
Discharge and the current in amperes.
Figure 31 Input power fail, load on battery
2.3.4 Off Battery
The battery plant can be disconnected from the UPS, if required for battery maintenance,
by opening the module battery disconnect (BCB) circuit breaker. In this situation the UPS
module will continue to supply conditioned power to the critical load, but if input power
fails the UPS system cannot supply power to the load.
CAUTION
When the UPS system is operating with the module battery disconnect (BCB) circuit
breaker(s) open, the critical load is not protected from loss of the utility source power.
Figure 32 Load on UPS, battery not available
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