Page 14 - GuardII+ Series 4208 Platform SM User Manual

GuardII+ SM Card Operation

4.1. Online vs. Offline

While online, GuardII+ does not require user intervention for any basic functionality; it will
run measurements, evaluate SM data, save measurements in the Archive, and produce
measurement results via Modbus. This is the normal mode of operation.

While offline, GuardII+ stops collecting data.
WARNING:
The monitor MUST be online for normal operation.
If GuardII+ is turned on, but has been offline for more than 24 hours, it will
automatically go online.

4.2. SM Measurement Cycle

SM measurements are performed every 30 minutes; on the hour and at half-past the hour.
When performing SM measurements, the monitor will run through the following cycle:
• Collect and analyze SM data
• Update Operating Condition data.

• Check measurement data for new Alerts; activate the Alert if necessary.
• Update Modbus slave SM data.

NOTE:
When a GuardII+ includes other technologies such as magnetic flux
monitoring or endwinding vibration monitoring, the SM measurement cycle
time will not be significantly affected by these other monitoring
technologies.

4.3. Operating Conditions
Measurement results can be affected by the current Operating Conditions of the asset
such as voltage, active power/load, temperature, humidity, etc. Operating Conditions help
when analyzing collected data.
There are three available sources of Operating Condition data:
• Directly from a Modbus slave

• From a Remote I/O Unit (optionally included with the GuardII+)
• From the ambient condition sensor (optionally included with the GuardII+)

The following operating conditions can be measured during SM monitoring.

Operating Condition Units Acquired Using:
Active Power W, kW, MW, hp Modbus, Remote I/O
Reactive Power var, kvar, Mvar Modbus, Remote I/O
Field Voltage Vdc, kVdc Modbus, Remote I/O
Field Current Adc, kAdc Modbus, Remote I/O

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