Vertivâ„¢ NetSureâ„¢ Control Unit (NCU) User Manual
Alarm Name Alarm Description Action to Correct
Rectifier Communication Fail A rectifier has lost communications with the controller.
Check communications cables. Reset the
Communication Fail alarm. Replace the rectifier.
Derated A rectifier is in output power derating mode.
Refer to Rectifier User Manual for troubleshooting
information.
Current Sharing Alarm A rectifier has a current sharing alarm.
AC Undervoltage Protection A rectifier is in under voltage protection mode.
Solar Converter Group Alarms
Multiple Solar Converter Failure More than one solar converter has failed.
Check input voltage to solar converters. Replace solar
converters.
Solar Converter Lost A solar converter cannot be detected by the controller.
Reset the Solar Converter Lost alarm. Replace
defective solar converter.
All Solar Converters Comm Fail
No response from all solar converters for a time
duration of 73 hours.
Check the connectors and cables or the CAN loop.
Check the DC input to the solar converters. Replace
the controller.
Solar Converter Alarms
Input Failure No input power to a solar converter. Check why no input power available.
Solar Converter Temperature High A solar converter has a high temperature condition. Check why temperature is high.
Solar Converter Fail A solar converter has a fault condition.
Refer to Solar Converter User Manual for
troubleshooting information.
Over Voltage A solar converter has an overvoltage condition.
Solar Converter Protected A solar converter is in protected mode.
Fan Fail A solar converter’s fan has failed. Replace fan.
Current Limit A solar converter is in current limit.
Solar converter overload. The load is higher than solar
converter capacity. If one or more of the solar
converters are defective, replace the faulty solar
converters.
Solar Converter Comm Fail
A solar converter has lost communications with the
controller.
Check communications cables. Reset the Solar
Converter Communication Fail alarm. Replace the solar
converter.
Derated A solar converter is in output power derating mode.
Refer to Solar Converter User Manual for
troubleshooting information.
Current Share Alarm A solar converter has a current sharing alarm.
Input Under Voltage Protection A solar converter is in under voltage protection mode.
Input Not DC Input to solar converter mounting position is not DC. --
Battery Group Alarms
Short Battery Test Running Battery is in short time test mode. --
Equalize for Test Battery is in equalize charge test mode. --
Manual Test Battery is in manual battery discharge test mode. --
Planned Test Battery is in planned battery test mode. --
AC Fail Test
AC power has been switched off to the rectifiers to
perform a battery discharge test.
--
Manual Equalize Battery is in manual equalize charging mode. --
Automatic Equalize Battery is in automatic equalize charging mode. --
Cyclic Equalize Battery is in cyclic equalize charging mode. --