Page 16 - GuardII+ Series 4208 Platform EV User Manual

GuardII+ EV Card Operation

• Collect and analyze EV data

• Update Operating Condition data.
• Check measurement data for new Trigger conditions; Archive the data if necessary.

• Update Modbus slave EV data.
NOTE:
When a GuardII+ includes other technologies such as magnetic flux
monitoring or shaft monitoring, the EV measurement cycle time will
occasionally be interrupted by measurements performed on these other
monitoring technologies. Partial Discharge (PD) measurements do not
affect the EV measurement cycle.

4.3. Synchronization

A shaft trigger signal can be used to synchronize the EV acquisition. 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 notch or small metallic square.
NOTE:
A shaft trigger is not required when acquiring EV measurement data,
however, EV phase information cannot be trended without a shaft trigger,
and the Synchronized operating point (refer to Section 4.5) cannot occur.

4.4. Operating Conditions
Measurement results can be affected by the current Operating Conditions of the asset
such as active power/load, stator winding temperature, stator current, 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 EV 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
Asset Temperature °C, °F Modbus, Remote I/O
Stator Current A, kA Modbus, Remote I/O

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