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NetSure -48V DC Bulk Output Power System Installation and User Instructions (UM582127100)
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Rev. E
55
TROUBLESHOOTING AND REPAIR
Contact Information
Refer to Section 4154 (provided with your customer documentation) for support contact information.
Controller and Rectifiers
For troubleshooting and repair instructions on these units, refer to the following documents.
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NCU Controller Instructions (UM1M830BNA)
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Rectifier Instructions (UM1R483500E)
NCU Controller Configuration
If any NCU Controller configuration settings were changed, refer to the NCU Instructions (UM1M830BNA) and
save a copy of the configuration file. This file can be used to restore the NCU Controller settings, if required, at
a later date.
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Note that provided on a USB drive furnished with the system is an NCU configuration drawing (C
drawing) and the NCU configuration files loaded into the NCU as shipped.
System Troubleshooting Information
This system is designed for ease in troubleshooting and repair. The various indicators as described in “Local
Controls and Indicators” on page 35 and in the Controller and Rectifier Instructions are designed to isolate
failure to a specific element. Once the faulty element has been identified, refer to “Refer to the NCU
Instructions (UM1M830BNA) for a procedure to clear the alarm.
Replacement Information” on page 56 and “Replacement Procedures” on page 56.
Troubleshooting Alarm Conditions on the NCU Controller
The NCU Controller displays alarm conditions as listed in the “Resolving Alarms” section of the NCU
Instructions (UM1M830BNA). Programmable external alarm relays are also available. Refer to “Digital Inputs
and Programmable Relay Outputs” on page 34 and the configuration drawing (C-drawing) supplied with your
power system documentation for your alarm relay configurations.
The NCU’s Active Alarm and Alarm History submenus allow the User to view alarm details. Refer to the NCU
Instructions (UM1M830BNA) to access these menus.
Checking the NCU Current Limit Point after Adding or Removing a Rectifier
If a rectifier is added to the power system, the system current limit point will automatically increase by the
percentage each existing rectifier was set to provide prior to the addition.
If a rectifier is removed from the system (and the Rect Comm Fail alarm is reset), the current limit point will
remain unchanged unless the capacity of the remaining rectifiers is not sufficient to maintain the present
current limit point. If that happens, the current limit point will automatically increase to the maximum (121% of
the remaining rectifiers).
It is recommended that the current limit point be checked whenever a rectifier is added to or removed from the
power system.
Refer to the NCU Instructions (UM1M830BNA) for a procedure.
