Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 40)

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Calibrate the TACH setting only when a tachogenerator is used. The
TACH setting, like the IR COMP setting, determines the degree to which
motor speed is held constant as the motor load changes.
To calibrate the TACH trimpot:
1. Disconnect power from drive.
2. Connect the tachogenerator to T1 and T2. The polarity is + for T1 and
– for T2 when the motor running in the forward direction.
3. Set switch 504 (SW504) to ARM for armature feedback.
4. Apply power to drive.
5. Set the speed adjust potentiometer full CW. Measure the armature
voltage across A1 and A2 using a voltmeter.
6. Set the speed adjust potentiometer to 0 (zero speed).
7. Disconnect power from drive.
8. Set SW504 to TACH for tachogenerator feedback.
9. Set the IR COMP trimpot full CCW.
10. Set the TACH trimpot full CW.
11. Apply power to drive.
12. Set the speed adjust potentiometer full CW.
13. Adjust the TACH trimpot until the armature voltage is the same value
as the voltage measured in step 5.
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.
Calibration
ATTENTION: Applying the incorrect polarity to the tachogenerator
can cause an overspeed condition. Make sure the positive (+) wire is
connected to terminal T1 and the negative (-) wire is connect to
terminal T2 when the motor is running in the forward direction. Failure
to observe this precaution could result in bodily injury.
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TACH