Vertiv™ NetSure™ Control Unit (NCU) User Manual
1.3.4 Battery Management
The NCU provides the following battery management functions.
• Battery Charge Temperature Compensation
• Battery Equalize Charge
• Battery Charge Current Limit
• High and Low Battery Temperature Alarms
• Battery Thermal Runaway Management (BTRM) Feature (Reduces Voltage during a High Battery Temperature Condition)
• Battery Discharge Test
• Battery Test Logs (maximum ten [10] tests saved)
• Battery LVD (Low Voltage Disconnect)
• Battery Capacity Prediction
• Battery Block and Battery Midpoint Monitoring
• Thermal Runway Detection and Management
NOTE!
Battery management functions are not available for NCU configurations that enable NCU capability to receive status
information sent from FIAMM SoNick (Sodium Nickel) batteries.
Battery Charge Temperature Compensation
The NCU can be programmed to automatically increase or decrease system output voltage to maintain battery float current as
battery temperature decreases or increases, respectively. Battery life can be extended when an optimum charge voltage to the
battery with respect to temperature is maintained. Temperature is monitored by a sensor mounted on the battery. See your power
system documentation for temperature sensor information. You can also set high and low compensation temperature alarms.
Functional Description (See Figure 1.2
):
Battery charge temperature compensation adds a correction term, related to the temperature of the batteries, to the nominal value of
the system voltage. The degree of regulation (TempComp Coeff), expressed in mV/°C/battery string, can be set per battery
manufacturer recommendations.
To protect batteries and voltage-sensitive loads, compensation is automatically limited to a maximum of two volts (48V systems) or
one volt (24 volt systems) above or below the nominal output level (float setting). Temperature compensation can be set to clamp
lower than this by enabling the Temperature Compensation Clamp feature. When enabled, temperature compensation will clamp if
the battery temperature reaches either the Temp Comp Max Voltage setting or the Temp Comp Min Voltage setting.
Temperature compensation is automatically disabled if communication between the controller and all rectifiers is lost, a DC over or
under voltage alarm activates, a low voltage disconnection occurs, manual mode is entered, or the system enters the equalize or test
modes.
Refer to “Specifications” on page 260 for temperature probe and reading accuracy.
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