Rockwell Automation Publication 20D-PM001D-EN-P - March 2019 165
Application Notes Appendix B
Figure 4 - Motor Overload Curve When Par 338 [Mtr I2T Spd Min] Is Equal To 1.0
Motor Overload Memory Retention Per 2005 NEC
The PowerFlex 700S drive with Phase II control (firmware 3.001 and higher) has
the ability to retain the motor overload count at power down per the 2005 NEC
motor overtemperature requirement.
• To enable motor overload memory retention, set bit 20 “Motor OL Ret” of
parameter 153 [Control Options] to “1”.
• To disable motor overload memory retention, set bit 20 “Motor OL Ret”
of parameter 153 [Control Options] to “0”.
The motor overload count value can be viewed in parameter 341 [Mtr I2T
Count].
P336 [Motor OL Factor]
Current
Speed
When the value of Par 338 [Mtr I2T Spd Min] equals 1.0, the curve
is flat - at the value of rated motor current times the value of Par
336 [Motor OL Factor]. If the motor current exceeds the value of
the curve, the value of the motor overload output integrates. The
value of the motor overload output is visible in Par 330 [Fault TP
Data] when the value of Par 329 [Fault TP l] equals 13.
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