Page 14 - GuardII+ Series 4208 Platform Flux User Manual

GuardII+ Flux Card Operation

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

4.3. Synchronization

To properly identify the poles, a synchronization source is used; the recommended source
is a shaft trigger (or keyphasor) signal. The shaft trigger is a proximity switch that provides a
once-per-revolution signal when it detects a target on the machine shaft such as a small
rubber or metallic square.
If a shaft trigger signal is not available, an alternative is to synchronize from the ac power
that is running the monitor.
NOTE:
When using ac synchronization, the GuardII+ will not be able to
consistently and reliably identify the machines’ poles. To accurately
identify which pole(s) are shorted on these machines, a shaft trigger signal
is required.

4.4. 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 two available sources of Operating Condition data:

• Directly from a Modbus slave
• From a Remote I/O Unit (optionally included with the GuardII+)

The following operating conditions can be measured by the flux monitoring; each can be
acquired from either a Modbus slave or a Remote I/O Unit.

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
Asset Temperature °C, °F Modbus, Remote I/O
Pump Storage Mode Pump, Generate Modbus, Remote I/O

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