Rockwell Automation DC3RD Digital Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 44)

36 Calibration
IMPORTANT : Calibrate the TACH trimpot 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.
TACH (for use with tachogenerator feedback only)
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.
ATTENTION: The control circuit is at line potential
when the drive is energized. Use a non-metallic
screwdriver when making adjustments to the circuit
board potentiometers. Exercise extreme caution as
hazardous voltage exists. Failure to observe these
precautions could result in severe bodily injury of loss
of life.
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