Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 65)

57 Calibration
IMPORTANT : Calibrate the TACH VOLTS setting only
when a tachometer is used. The TACH VOLTS setting, like
the IR COMP setting, determines the degree to which the
motor speed is held constant as the motor load changes.
To calibrate the TACH VOLTS trimpot:
1. Disconnect power from drive.
2. Connect the tachometer to T1 and T2. The polarity
is (+) for T1 and (-) for T2 when the motor is running in
the forward direction.
TACH VOLTS
ATTENTION: Applying the incorrect polarity to the
tachometer 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 or loss
of life.
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