Vertiv™ NetSure™ Control Unit (NCU) User Manual
4. If the system enters the ECO mode and then exits for five consecutive times within one hour, an abnormal alarm (ECO Cycle
Alarm) will be generated and the system can no longer enter the ECO mode until the ECO Cycle Alarm is cleared manually or
retires automatically after 24 hours.
1.3.6 Power Split Feature
The Power Split feature allows you to connect the power system controlled via the NCU to an existing DC power system instead of
extending or completely replacing the existing DC power system.
The power system controlled via the NCU functions as “System A” to share load (split output) with the existing system (“System B”)
that requires expansion. The NCU does not require communication with the “System B’s” controller.
The Power Split feature provides for the sharing of total load in a controlled manner between the paralleled power systems.
When Power Split is programmed, the NCU adjusts rectifier output voltage per load demands to ensure proper sharing between
“System A” and “System B”. See Figure 1.5.
Figure 1.5 Power Split Feature
1.3.7 AC Generator Function
This is a special feature to control an AC generator using the NCU controller by either a voltage threshold or a battery capacity
threshold. The control occurs from a User designated relay located on the IB2 or EIB board. When this generator relay is activated,
this means the generator should turn “On”. Criteria for the generator function is to start the generator when either the output voltage
(AC Generator Start Voltage setting) or battery capacity (AC Generator Start Capacity setting) decreases to the set point. Once this
occurs, an alarm called “Automatic AC Generator Run” is activated, the relay changes state, and the generator is told to start. The
generator runs for a period of time and is then turned off after the Auto Equalize feature of the controller finishes.
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