Vertiv™ NetSure™ Control Unit (NCU) User Manual
recharge process will follow the recharge profile shown in Figure 1.6. 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 12.
Relay Assignment – when in Hybrid Mode
Relay 1: Generator Alarm.
No Generator Voltage Alarm. No AC supply, 60 sec delay.
Relay 2: Battery Alarms.
Logic alarm generated from: under voltage 1, under voltage 2, LVD1, LVD2, battery high temp, battery very high temp, overvoltage 1,
overvoltage 2, battery temp sensor fail, battery fuse alarms and high load alarm.
Relay 3: Rectifier Alarms.
Logic alarm generated from: multiple rectifier fail, rectifier fail, rectifier fan failure, rectifier HVSD, rectifier AC failure and rectifier not
responding.
Relay 4: System Alarms.
Logic alarm generated from: load fuse alarms, high ambient temperature, ambient temp sensor fail; smoke detected, and water
detection.
Relay 5: Generator Run at High Temp.
Output to intelligent cooling devices linked to AC supply (DG run).
Relay 6: Intruder Alarm.
Alarm triggered by dry contact door/motion sensor.
Relay 7: Diesel 1 in Operation.
Output to DG1 on site. DG is set on for the duration of the signal.
Relay 8: Diesel 2 in operation.
Output to DG2 on site. DG is set on for the duration of the signal.
Fixed Daily
In this mode of operation, the total duration of a complete cycle is 24hrs. This duration is necessary as the operation is synchronized
with day-night temperature pattern. When an extended recharge cycle is required, its termination will still follow the 24hrs schedule.
Cycle Duration: A complete cycle consists of discharge and charge periods during the combined total of 24hrs. The discharge
period starts at 7pm. It is then followed by recharge period (Diesel Generator ON) for the remainder of the 24hrs. The discharge time
is User selectable in the range 1hrs to 22hrs, default setting is 12hrs.
Discharge: The discharge start time and duration are settable. Discharge period starts at 7pm. The discharge time is User
selectable in the range 1hours to 22hours, default setting is 12 hours.
Recharge: Recharge period (Diesel Generator ON) follows after discharge for the remainder of the 24hrs. Recharge is performed at
equalize voltage until added equalize time elapses and at float voltage for the remaining charge time.
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