Battery Management - GE On-line VH Series User Manual

4.6

BATTERY MANAGEMENT

Maximum battery life and reliability are obtained by the following features:

Quick battery test
The quick battery test checks whether the batteries and their wiring are healthy. If a quick battery test shows that the
batteries are close to being worn out, a 'bad battery' alarm will be generated (see 4.4.9). Batteries have to be replaced as
soon as possible.
Automatic battery test
The VH Series UPS conducts periodic automatic battery tests:
 5 hours after manual switch-on
 5 hours after return of mains following any power failure, and
 30 days from the last battery test
Manual battery test
A quick battery test can be initiated manually
- either via the front panel, by pressing pushbutton 'I' for 5 seconds during normal operation,
- or via UPS monitoring software. For details please refer to the manual of your software.
NOTE
If the test is started manually immediately after installation or after a power failure, the UPS may
generate a false 'bad battery' alarm as the batteries have been (partly) discharged during
transport/storage or during a power failure.

Deep battery test
A deep battery test, to be initiated through the UPS monitoring software, checks the actual battery capacity in order to
ensure accurate runtime prediction. During a deep battery test the batteries will be discharged.
NOTE
When executing a deep battery test the available runtime in case of mains failure may be shorter than
normal. Don't execute this test if reduced battery runtime is not acceptable.

Temperature compensated battery charging
This feature adjusts the battery charge voltage according to the ambient temperature. As a result poor charging of the
batteries under low temperature conditions and overcharging of the batteries under high temperature conditions are
avoided.

Load dependent battery-end-voltage
The allowable final battery voltage depends on the discharge current: the higher the current, the lower the 'end-of-
discharge' battery voltage. In this way maximum battery capacity is obtained without over-discharging. Over-discharging
would result in shortened service life and failure to recover normal capacity.

Automatic boost charge
This feature reduces the battery recharge time considerably: totally depleted batteries will be recharged to 90% in approx. 3
hours, provided that discharging took place at 100% load.
Modifications reserved
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Critical Power
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Operating Manual VH2000-3000 208V UL