Emerson Liebert NX 0250kTK16FN01000, Руководство пользователя

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8 Chapter 1 Overview
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
Parallel redundancy mode
For higher capacity or higher reliability or both, the outputs of multiple UPS modules can be programmed for directly
paralleling while a built-in parallel controller in each UPS ensures automatic load sharing. The parallel system can be
composed of up to four UPS modules.
1.5 Battery Management
The following battery management functions are set by commissioning engineer through background software.
1.5.1 Normal Function
1. Constant current boost charge.
The charge current can be set.
2. Constant voltage boost charge.
The boost charge voltage can be set as required by the type of battery.
For VRLA batteries, the maximum boost charge voltage should not exceed 2.4V/cell.
3. Float charge.
The float charge voltage can be set as required by the type of battery.
For VRLA batteries, the float charge voltage should be between 2.2V/cell and 2.3V/cell.
4. Float charge temperature compensation (optional).
The temperature compensation coefficient can be set as required by the type of battery.
5. EOD protection.
When the battery voltage drops to the EOD voltage, the battery converter shuts down automatically and the battery is
isolated to avoid further battery discharge. The EOD voltage is settable from 1.6V/cell to 1.9V/cell (VRLA).
6. Battery low pre-warning time.
The battery low pre-warning time is adjustable between 3min and 60min. The default setting is 5min.
1.5.2 Advanced Function
The UPS provides battery maintenance test function. At periodic intervals, 20% of the rated capacity of the battery will
be discharged automatically, and the actual load must exceed 20% of the nominal UPS capacity. If the load is less
than 20%, the automatic discharge cannot be executed. The periodic interval can be set from 30 to 360 days. The
battery maintenance test function can be disabled.
Conditions: battery at float charge for at least 5h, load equal to 20% ~ 80% of rated UPS capacity.
Trigger: automatically, or manually through the command of Battery maintenance test in LCD.
Interval: 30 ~ 360 days (default setting: 60 days).
1.6 Battery Protection
The following battery protection functions are set by commissioning engineer through background software.
Battery low pre-warning
The battery low pre-warning occurs before the EOD. After this pre-warning, the battery should have the capacity for
three remaining minutes discharging with full load. The time can be configured from 3min to 60min.
EOD protection
When the battery voltage drops to the EOD voltage, the battery converter shuts down. The EOD voltage is adjustable
from 1.6V/cell to 1.9V/cell (VRLA).
BCB alarm
The BCB alarm occurs when the BCB opens.