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Function Descriptions
Rectifier Control
The controller controls rectifiers automatically.
System Components Monitoring and System Alarms Generation
The controller monitors the components comprising the system (such as the rectifiers, supervisory modules,
etc.) and generates alarms if a fault condition occurs. The controller also maintains an alarm history log.
The available system alarms are programmed with an Alarm Severity Level. Each Alarm Severity Level has
different visual/audible alarm attributes. Available Alarm Severity Levels and their attributes are listed in Table
1.
The available system alarms can also be mapped to controller alarm relays that can be wired to external alarm
circuits.
Table 1:
Alarm Severity Levels
Alarm
Severity Levels
Critical Alarm (CR)
Major Alarm (MJ)
Minor Alarm (MN)
No Alarm (NA)
• Alarm Status Setting: Indicates if the alarm is active or not active, and the
severity level if active. The available alarm status settings are as follows.
Critical Alarm: The fault endangers the power systems continued
-
function.
-
Major Alarm: The fault reduces the power systems functionality.
-
Minor Alarm: Special operating condition.
-
No Alarm: The alarm is disabled and no alarm is given.
• The alarm indicator turns OFF if the fault(s) that triggered the alarm clears.
• The audible alarm can be silenced by pressing any key on the controller
local interface pad. The audible alarm is also silenced if the fault(s) that
triggered the alarm clears.
• An audible alarm cutoff feature can be programmed that silences the
audible alarm after a preset programmable time period. The audible alarm
can also be disabled.
Operating Data Acquisition and Data Logs
The controller acquires and analyses real time data from the system's components such as the rectifiers and
supervisory modules.
The controller uses this data to process alarms and also records data in logs. The logs are viewed using the
Web Interface and consists of the following. Logs can be saved in the .html (Web page) or .txt (text) format.
• Alarm History Log: Records 4000 latest alarms. The Web Interface displays the latest 500 items.
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| NetSure™ Mini Control Unit User Manual (UM1M831ANA) | Rev. B
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Audible
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