Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 123
Metering Chapter 5
Table 26 - Metering Parameters Associated with Current
Voltage
Line-to-Line and Line-to-Neutral RMS voltage is calculated for all three phases
with the average of the three voltages also provided. The data is provided
whenever 3-phase power is applied.
The accuracy of the voltage calculations is ±2% of the true RMS voltage.
Table 27 - Metering Parameters Associated with Voltage
Torque
The SMC-50 control module calculates true electromechanical torque based on
the existing motor voltage and current feedback data.
The accuracy of the torque calculations is ±10% of the true electromechanical
torque.
Table 28 - Metering Parameters Associated with Torque
Parameter Number Name/
Description
Min/Max Value Default Value Access Units
5 Current Average 0…15,000 0 R Amps
6Current Phase A
7Current Phase B
8Current Phase C
Parameter Number Name/Description Min/Max Value Default Value Access Units
1 Voltage P-P Average [0]…15,000 [0] R Volts
2 Volts Phase A-B
3 Volts Phase B-C
4 Volts Phase C-A
265 Voltage P-N Average [0]…9000 [0] R Volts
266 Volts Phase A-N
267 Volts Phase B-N
268 Volts Phase C-N
TIP • During Braking operations, Torque reads 0.
• For the Torque parameter to display correctly, the motor value for Rated
Torque, Parameter 47, and Rated Speed, Parameter 48, must be correctly
configured.
Parameter Number Name/Description Min/Max Value Default Value Access Units
9 Torque -50...300 0 R %
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