Adjustments; Current Limit; Minimum Speed; Maximum Speed - DART Controls 730 BLMC Serie Manual Del Usuario

Current Limit

Dart has factory set the Current Limit to 125% of 8.5 Amps DC. This setting should not need to be in-
creased. If the current limit needs to be set to a lower value, do so by adjusting the Current Limit trimpot
(CL) CCW until the desired setting is achieved.
Setting Current Limit
Current Limit should normally be set to approximately 125% of the FLA rating of the motor that is running.
To set current limit for the specific motor or application, follow these steps while monitoring motor current:
1) Preset Current Limit trimpot (CL) fully CW.
2) Run motor at full or normal running speed.
3) Load motor to 125% of its FLA rating or the desired maximum load.
4) Measure the DC input current with an analog DC current meter placed in series with the Positive
DC input lead.
5) Decrease the Current Limit trimpot setting until the motor current begins to drop, and then
slowly increase the setting until just reaching the desired maximum current as obtained in step 3.
Note: Do not use the Current Limit trimpot as a torque control or to reduce the speed of a motor.
Caution: Remember, keep the average current at 9.0 Amps or under, and make sure the motor is
rotating. A stalled motor, after about 30 seconds, may overheat and cause extensive damage to
the control and/or motor.

Minimum Speed

Turn the speedpot to zero (fully CCW). Next turn the minimum trimpot (MIN) clockwise until the motor
begins to rotate. Slowly rotate the trimpot CCW until the motor stops. The control will now run with a zero
deadband. If a nonzero minimum speed is desired, rotate the trimpot CW to the desired setting.

Maximum Speed

Turn the speedpot fully clockwise. Adjust the maximum trimpot (MAX) counterclockwise to the desired
maximum output.

Closed Loop Gain

1. Adjust the Maximum speed trimpot (MAX) to 50% CW rotation.
2. Set Closed Loop Gain trimpot to the fully CW position.
3. Advance speedpot to the fully CW position. The motor should now be rotating at its maximum speed*.
4. Slowly rotate the Closed Loop Gain trimpot CCW until the motor speed decreases slightly**,
then rotate the trimpot back CW just enough to return the motor to full speed.
5. Refer to the above Minimum Speed (MIN) and Current Limit (CUR LIM) trimpot adjustments.
*
If the motor doesn't reach its maximum speed with the speedpot and the gain pot fully CW, rotate the
MAX trimpot CW until it does. Proceed with step 4.
**
If rotating the Closed Loop Gain trimpot fully CCW and the motor speed doesn't decrease, rotate
the MAX trimpot CCW just enough to make the speed decrease slightly. Then rotate the Closed Loop
Gain trimpot CW just enough to return the motor to full speed.

Adjustments

7