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Magtrol Model DSP7000 Dynamometer Controller
Chapter 4 – PID Settings
SETUP
4.3.4 SeTTing THe piD for raMp Down
It is nearly impossible to select a PID value that optimizes the control loop over a wide range of speed.
With Magtrol’s experience in motor test, their engineers have developed a dynamic PID algorithm.
The PID values change with the Speed Set Point. In most cases, the PID values are high when the
motor is lightly loaded and tend to decrease at higher loads.
Magtrol’s M-TEST Software provides a setup PID function in the setup for the ramp test. In the
M-TEST Software, the dynamic scaling can be enabled or disabled and the span of the scaling can
also be selected.
Figure 4–9 Ramp Down Low I
Ramp shows low value for I term. Note “bump” at beginning of ramp and good results toward end
of ramp.
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