Vertivâ„¢ NetSureâ„¢ Control Unit (NCU) User Manual
Float Charge: Default float voltage is 54.0 V at 20°C with a temperature compensation of 72 mV per °C.
If battery temperature exceeds the BTRM Temp High 2 alarm set point, the charge voltage is reduced to 48 V to reduce gassing and
prevent thermal runaway. The same is applicable as well for equalizing charge.
Equalizing Charge Cycle: As the cyclic use does not ensure complete battery recharge after every cycle, an equalizing charge cycle
is added. The equalizing cycle is settable for every 2 to 365 days intervals, default setting is 100 days. Equalizing charge time is 12
hours independent of discharge time setting. Equalizing charge is performed at equalize voltage until end of additional equalize time
and thereafter at float voltage for the remaining time. Also see Figure 1.6.
Equalize charge independently settable 0-1440 min (already set in equalize charge).
Figure 1.6 Charge Voltage
Early Termination of the Discharge Periods
During discharge, over temperature and under voltage conditions will interrupt the discharge and change the operation to
charge with the Diesel Generator ON.
Over Temperature: The diesel generator will start and run for a period before it is stopped again. The run time is User selectable in
the range 30 to 120 minutes, default setting is 60 minutes. Temperature is referenced to cabinet/shelter ambient temperature sensor
connected to controller, not battery temperature. Over temperature start can be disabled completely from the Settings menu.
Under Voltage: The under voltage start is triggered by under voltage alarm 2 voltage settings.
The diesel generator will start and run until the normal recharge cycle is due to finish depending on selected mode of operation.
Under Voltage with Fixed Daily Time: If the normal recharge cycle is from 7am until 7pm and under voltage has started the Diesel
Generator at 5:30am, the effective recharge will be from 5:30am until 7pm.
Under Voltage with Capacity Discharge: If this mode is selected, the recharge will terminate.
Operation with Grid Power
Grid power is always used when available. If grid power becomes available during battery discharge, the discharge cycle is terminated
and recharge cycle is initiated. If grid power becomes available during diesel generator operation, the diesel generator is switched
OFF and operations continue on grid power.
Battery Recharge with Grid Power: Battery recharge with grid power can start from the beginning (when grid power becomes
available during battery discharge) or can continue from diesel generator recharge, depending on the timing. In both cases, the
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