Vertiv™ NetSure™ Control Unit (NCU) User Manual
will shut off and the AC generator function will reset. If the generator is told to run and the plant DC voltage is above the “AC
Generator Start Voltage” and after 5 minutes you don’t get the “Auto EQ” alarm, then the generator turns off. The AC
generator can also be started manually (enable “Manual AC Generator Run”). The AC generator will stay running as long as
you are in the "Manual AC Generator Run" mode.
- “AC Generator Function”: Select “Disabled” (default), “Voltage”, or “Battery Capacity”.
a) When “Voltage” is selected, the following menu items are available.
- Manual AC Generator Run: Turns on the AC Generator manually (select “Enabled”). The “Manual AC Generator Run”
alarm activates to trigger the associated relay to start the generator. To turn off the generator, select “Disabled”.
- AC Generator Start Voltage: When output voltage decreases to this setting, the “Automatic AC Generator Run” alarm
activates to trigger the associated relay to start the generator.
- DI for AC Generator (optional): A signal from the AC Generator can be connected to this NCU digital input to indicate
it is running. If this signal does not change state when the generator should be running, the “AC Generator Fail” alarm
activates.
- Site Has AC Utility Power (optional): Used to suppress the “AC Mains Failure” alarm.
b) When “Battery Capacity” is selected, the following menu items are available.
- Manual AC Generator Run: Turns on the AC Generator manually (select “Enabled”). The “Manual AC Generator Run”
alarm activates to trigger the associated relay to start the generator. To turn off the generator, select “Disabled”.
- AC GEN Start Batt Capacity: When battery capacity decreases to this setting, the “Automatic AC Generator Run”
alarm activates to trigger the associated relay to start the generator.
- DI for AC Generator (optional): A signal from the AC Generator can be connected to this NCU digital input to indicate
it is running. If this signal does not change state when the generator should be running, the “AC Generator Fail” alarm
activates.
- Site Has AC Utility Power (optional): Used to suppress the “AC Mains Failure” alarm.
c) Associated Alarms (see “Alarms Tab” on page 193 in the Advance Settings menu). See also Table 2.3 on page 63.
- Automatic AC Generator Run
- Manual AC Generator Run
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