Vertiv™ NetSure™ Control Unit (NCU) User Manual
Programming the NCU Power Split Feature
After an NCU power system has been connected to an existing power system and both systems set for the same float voltage, you will
have to configure the Power Split parameters in the NCU.
Procedure
1. In the Web Interface menus, set the Power Split mode to enabled. Navigate to Settings Menu / System / Power System /
PowerSplit Mode. Set this parameter to “enabled”.
2. Reboot the NCU by pressing ESC and ENT at the same time.
3. Navigate to Settings Menu / System / Power System.
4. Set the “Power Split Current Limit Value” to a value that will force the NCU system’s rectifiers to operate in current limiting
mode.
NOTE!
The Power Split Current Limit Value must be set lower than the total distribution current from the two plants. The
default value is 60% of the NCU power system’s rectifier capacity.
5. Set the “Delta Voltage”. This voltage is by default set to 0.5 V but can be readjusted.
• If the distribution current is lower than 50% of the total capacity of the NCU power system, the “Delta Voltage” can be
adjusted to a lower level than 0.5 V to get a system voltage that is closer to the desired float charging voltage.
• If the voltage drop between the existing system and the NCU system is expected to be >0.5 V, the “Delta Voltage” can be
adjusted to a higher level than 0.5 V to get a correct split function.
• Temperature controlled battery charging cannot be set in the NCU power system in power split mode. If this function is
implemented in the existing power system, a limited function within a temperature range of approximately ±15 °C will be
achieved if the Delta Voltage is set to a higher level, maximum 2.00 V.
• If the “Delta Voltage” 0.5 V is considered to be too high, the split function can be tested at various modes of operation to
find a lower setting.
Optional Function Setup
Equalize Charge Setup
If the equalize charge function is to be used, equalize charge must be implemented in the existing power system and an equalizing
signal from its control unit must be connected to the NCU.
1. In the Web Interface menus, navigate to Settings Menu / Battery / Equalize Charge Voltage. Set the “Equalize Charge
Voltage” to the same value as the equalize voltage of the existing power system.
2. Using the Web Interface menus (see “Power Split Tab” on page 216), select the NCU digital input connected to the existing
systems equalize control circuit.
NOTE!
Equalize charging is controlled by the existing power system via an incoming digital signal. The system will remain at
the set equalize charge voltage level as long as this signal is active.
Battery Test Setup
If the battery test function is to be used, battery test must be implemented in the existing power system and a test signal from its
control unit must be connected to the NCU.
1. In the Web Interface menus, navigate to Settings Menu / Battery Test.
2. Set the “End Test Voltage” to the same value as the end voltage of the existing power system.
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