Emerson Liebert NX User Manual download pdf (Page 52)

Operation

5.4 Battery Management—Set During Commissioning

5.4.1 Normal Function

• Constant charging current—Current can be set up to limit charging power.

• Constant boost voltage boost (if applicable)—Voltage of boost charging can be set as required

by the type of battery.

For Valve Regulated Lead Acid (VRLA) batteries, maximum boost charge voltage should not

exceed 2.4V / cell.

• Float Charge—Voltage of float charging can be set as required by the type of battery.

For VRLA, float charge voltage should be between 2.2V to 2.3V.

• Float Charge Temperature Compensation (optional)—A coefficient of temperature compen-

sation can be as required by the type of battery.

• End of discharge protection (EOD)—If the battery voltage is lower than the EOD, the battery

converter will shut down and the battery is isolated to avoid further battery discharge. EOD is

settable from 1.6V to 1.75V per cell (VRLA) or 0.9 to 1.1 V per cell (NiCd).

• Battery Low Warning Time—Settable between 3 and 60 minutes. The default is 5 minutes.

5.4.2 Advanced Functions (Software Settings Performed by the Commissioning Engineer)

Battery Self-Test and Self-Service

At periodic intervals 20% of the rated capacity of the battery will be discharged automatically. The

minimum amount of load must exceed 20% of the nominal rating of the UPS module. If the load is less

than 20%, auto-discharge cannot be executed. The periodic interval can be set from 30 to 360 days.

The periodic testing can also be inhibited.

• Conditions—Battery float charge for at least 5 hours, load 20~100% of rated UPS capacity

• Trigger—Manually through through the command of Battery Maintenance Test in the LCD

panel or automatically

• Battery Self-Test Interval—30-360 days (default setting is 60 days)

5.5 Battery Protection (settings by commissioning engineer)

Battery Undervoltage Pre-warning

The battery undervoltage pre-warning occurs before the end of discharge. After this pre-warning, the

battery should have the capacity for 3 remaining minutes discharging with full load. The time is user

configured from 3 to 60 minutes.

Battery End of Discharging (EOD) Protection

If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is settable

from 1.6V to 1.75V per VRLA cell (or 1.0 to 1.1V per NiCd cell).

Battery Isolator Open Warning

If the battery isolator is open, this warning will occur.

The external battery to the UPS through an external battery isolator, which is manually closed and

electronically tripped via the UPS control circuits.

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Emerson Liebert NX User Manual Page 52