NetSure
™
Control Unit (NCU)
User Manual, UM1M830BNA
Spec. No: 1M830BNA, 1M830DNA Code: UM1M830BNA
Model No: M830B, M830D Revision M, May 12, 2017
Figure 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
recharge process will follow the recharge profile shown in Figure 6.
If battery becomes fully recharged and grid power is still present,
the operations will continue to be powered from grid and no
battery discharge will be initiated for the duration of grid
availability. In this case, battery voltage will revert back to Float
voltage.
Battery Discharge after Grid Failure: At the point of grid power
failure, the battery capacity is unknown as these events occur in
random manner. For the purpose of maximizing the use of grid
power and in anticipation of grid power becoming available again,
the Hybrid operation will continue with battery discharge cycle.
Discharge will continue until:
The preset discharge time elapses (Fixed Daily Time)
The preset DOD is reached (Capacity Discharge)
In both cases, the discharge can be terminated earlier as described
in “Early Termination of the Discharge Periods” on page 9.
Relay Assignment – when in Hybrid Mode
Relay 1: Generator Alarm.
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