8.5.4.3. Speed Control Method

You can change the Speed Control Method between Open Loop and Closed Loop

Closed Loop

Closed Loop speed control utilizes a proportional – integral (PI) algorithm to regulate MDR speed. When enabled, the module motor control processor accepts the input from the Hall Effect sensors to measure rotor speed and will adjust the motor output accordingly to attempt to regulate speed. The value entered is in percent of the motor’s rated speed. Closed Loop speed regulation can be used for applications where you need to maintain constant speed with varying carton weights. The default setting is for Closed Loop to be enabled.

Checking the Closed Loop check box enables Closed Loop speed control method. You can also use the Set All button to set the selected speed control method for each motor in the From Node # / To Node # boxes. In this example the Left MDRs from nodes 2 thru 12 will each get the same Speed Control Method speed setting.

*Also note that when Closed Loop is enabled; the units for Acceleration and Deceleration change from time-based (seconds) to distance-based (pulses). Motor pulses can be converted to linear distance based upon knowing the particular speed code of your MDR and its tube diameter. Please refer to Motor Pulse to Distance Calculation for details and an example of calculating this distance.

!Closed Loop speed control will provide PWM voltage to the MDR up to the limit of the particular MDR’s selected profile and/or the current limits allowed by the module’s built in protection algorithms and circuitry. To avoid unexpected results, please review your particular mechanical application along with the published MDR performance data prior to implementing Closed Loop speed control

Open Loop

Open Loop speed control does not utilize any such feedback to regulate speed. The value entered is the percent PWM waveform (or “throttle”) that is output to the motor and the actual rotor speed will fluctuate depending on the mechanical loading on the motor

Unchecking the Closed Loop check box disables Closed Loop speed control method and enables Open Loop speed control method. You can also use the Set All button to set the selected speed control method to each motor in the From Node # / To Node # boxes. In this example, all of the Left MDRs from nodes 2 thru 12 will each get the same Speed Control Method speed setting.

*Please note that if you change the Speed Control Method and this module goes through another Auto Configuration procedure, the Speed Control Method setting will not reset back to default. It will remain unchanged at the last selected setting.