34 Rockwell Automation Publication 6000-TD004D-EN-P - November 2017
Chapter 1 Functional Descriptions
• Current Limit Loop Ki (P134)
• Current Limit Loop Kd (P135)
When the output current is higher than the value of parameter Current
Limitation Threshold, the over load timer is triggered and the current limit is set
to the value of parameter Current Limitation Decel Ramp Slope Change. Once the
duration reaches the value of parameter Current Limitation Heating Time, the
current limit is set to the value of parameter Current Limitation Threshold.
When the output current is lower than the value of parameter Current Limitation
Threshold, the cooling timer is triggered. Once the duration reaches the value of
parameter Current Limitation Cooling Time, the current limit is set to the value
of parameter Current Limitation Threshold.
Figure 14 - Current Limit Diagram
Current Stability Loop
This function is used to solve current oscillation at low speed stator resistance
effect and output dead band effect.
The following parameters are used for this function:
• Current Stability Loop Filter Time Constant (P034)
• Current Stability Loop Output Scaling Factor (P035)
• Current Stability Loop Output Upper Limit (P036)
• Current Stability Loop Output Lower Limit (P037)
• Current Stability Loop Enable (P038)
• Current Stability Loop Enable Frequency Range Upper Limit (P039)
• Current Stability Loop Enable Frequency Range2 Upper Limit (P069)
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