Rockwell Automation DC3RD Digital Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 45)

To calibrate the TACH:
1. Connect the tachogenerator to T1 and T2. The polarity is
“+” for T1 and “–” for T2 when the motor is running in
the forward direction.
2. Set switch 504 (SW504) to ARM for armature feedback.
3. Set the power switch to ON.
4. Press FWD .
3. Set the forward speed adjust potentiometer full CW.
Measure the armature voltage across A1 and A2 using a
voltmeter.
4. Set the speed adjust potentiometer to 0 (zero speed).
5. Set SW504 to TACH for tachogenerator feedback.
6. Set the IR COMP trimpot full CCW.
7. Set the TACH trimpot full CW.
8. Set the speed adjust potentiometer full CW.
9. Adjust the TACH trimpot until the armature voltage is
the same value as the voltage measured in step 3.
Check that the tachogenerator is properly calibrated. The
motor should run at the same set speed when SW504 is set
to either armature or tachogenerator feedback.
37 Calibration
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