LEESON Chassis Mount Regenerative Control: 175721.00 - Manual (Page 41)

Tach Generator (TACH)
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. Connect the tachogenerator to T1 and T2. The polarity is
positive (+) for T1 and negative (–) for T2 with the motor
running in the forward direction.
2. Set switch SW504 to ARM for armature feedback.
3. Set the 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 switch 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.
35 Calibration