38Magtrol Model DSP7000 Dynamometer ControllerChapter4 – PID SettingsSETUP4.3 setting the CorreCt pid’s for your motorNote: Each type of motor will have it’s own optimum PID setting atdifferent load points.4.3.1 S eTTing THe piD wiTH an unknown MoTor or SySTeMIf the user is unfamiliar with the characteristics of the motor under test, it is recommended tobegin in open Loop Control mode. In doing so, the user can safely get an idea of the motor’sperformance.1. To enter open Loop Control mode, begin with the motor and brake oFF. Press the oPENLooP button. The display will appear as follows:POWERBRAKE STATUS SET POINT SET POINT P I DTORQUE SPEED USER DISPLAY0.000 X 0.000 XX.XX 0OFF 0.00 %OPEN LOOPPRELOADFigure 4–1 Open Loop Control Menu2. Set the percent excitation to zero using the decrease/increase dial.3. Start the motor.4. Turn on the brake power.5. Slowly increase the excitation current to the brake.6. Make a note of the torque and speed values of which the motor is capable.7. To exit the open Loop Control mode and return to the main menu, turn the motor and brakeoFF and press the oPEN LooP button.4.3.2 SeTTing THe piD for Torque ConTrol1. With the motor and brake oFF, set the desired Torque Set Point by pressing the ToRqUESET button and using the and buttons and Decrease/Increase dial.2. Set the P, I and D values to zero.3. Turn the motor oN.4. Turn the brake oN.5. Slowly increase the P term until the torque read is about 25% of the desired load point.
