American Control Electronics Minarik DRIVES RG500 Series, User Manual, Page: 54 / 72

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RG500 Series
Tachogenerator (TACH)
The TACH setting, like IR COMP setting, determines the degree to which
motor speed is held constant as the motor load changes. To calibrate
the TACH trim pot:
1. Connect the tachogenerator to T1 and T2. The polarity is positive
(+) for T1 and negative (-) for T2 when the motor is running in the
forward direction.
2. Set the feedback select switch SW504 to ARM for armature
feedback.
3. Set the speed adjust potentiometer or input voltage or current
signal to maximum speed. Measure the armature voltage across
A1 and A2 using a voltmeter.
4. Set the speed adjust potentiometer or input voltage or current
signal to zero speed.
5. Set SW504 to TACH for tachogenerator feedback.
6. Set the IR COMP trim pot to full CCW.
7. Set the TACH trim pot to full CW.
8. Set the speed adjust potentiometer or input voltage or current
signal to maximum speed.
9. Adjust the TACH trim pot until the armature voltage is the same
value as the voltage measured in step 3.
Check that the TACH is properly calibrated. The motor should run
at the same set speed when SW504 is set to either armature or
tachogenerator feedback.
Calibrate the TACH setting only when a tachogenerator is used.

!
WARNING!