Rockwell Automation DC3N DC Drive User Guide, 1/4-2HP-115/230 VAC User Manual

Page 36

TORQUE

Calibration

The TORQUE setting, commonly referred to as “current limit”, determines the
maximum torque for accelerating and driving the motor. TORQUE is factory set at
150% of rated motor current.

To calibrate TORQUE:
1. With the power disconnected from the drive, connect a DC ammeter in series

with the armature.

2. Set the TORQUE trimpot to minimum (full CCW).
3. Lock the motor shaft. Be sure that the motor is firmly mounted to withstand

maximum torque generated by the motor.

4. Connect power to the drive.
5. Set the speed adjust potentiometer to maximum reverse speed.
6. Adjust the TORQUE trimpot CW slowly until the armature current is 150% of

motor rated armature current.

7. Set the speed adjust potentiometer to minimum and remove power.
8. Remove the shaft lock from the motor.
See Figure 16 for recommended TORQUE settings.

ATTENTION:

Although the TORQUE trimpot is set to 150% of motor

nameplate current rating, continuous operation beyond that rating may damage
the motor.

DECEL

The DECEL setting determines the time the motor takes to ramp to a lower speed.
See Specifications on page 1 for approximate deceleration times. DECEL is factory
set for the fastest deceleration time (full CCW).

To set the deceleration time:
1. Set the speed adjust potentiometer full CW. The motor should run at maximum

speed.

2. Turn the speed adjust potentiometer full CCW and measure the time it takes the

motor to go from maximum to minimum speed.

3. If the time measured in step 2 is not the desired deceleration time, turn the

DECEL trimpot CW for a slower deceleration time, or CCW for a faster
deceleration time. Repeat steps 1 through 3 until the deceleration time is correct.