Cytron Single 10- 45V, 40A Brushed DC Motor Controller : Data Sheet : Page 17

ROBOT . HEAD to TOE

Product User’s Manual – MDS40B

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8.2 ANALOG/PWM INPUT MODE

In Analog/PWM input mode, the speed and direction of the motor is controlled by the analog

voltage or PWM signal. The valid input range is 0 – 5V and it’s very easy to control by using

a potentiometer. For example, the motor can be controlled by a joystick or foot pedal with

potentiometer.

NOTE: The Analog/PWM signal to stop the motor (2.5V if Sign-Magnitude mode is off,

0V otherwise) must be available when the Enhanced SmartDrive40 is turned on. Else, the

driver will show Input Error until the correct signal is available.

Analog input mode is selected by setting SW1 to 0 (Down) and SW2 to 1 (Up). PWM input

mode is selected by setting SW1 to 1 (Up) and SW2 to 0 (Down). SW3 – SW6 can be

configured depending on the requirement of the user.

Input Mode

SW1:SW2

01

10

Analog Input Mode – The input is analog signal. The filter

capacitor is not connected and the input signal is not filtered.

SW1 is for Input 1 while SW2 is for Input 2.

PWM Input Mode – The input is PWM signal. The filter

capacitor is connected and the input signal is low pass filtered to

be an analog signal. SW1 is for Input 1 while SW2 is for Input 2.

SW2 must be set to 0 if Sign-Magnitude mode is turned on.

Single/Mix Mode

SW3:SW4

00

10

11

Independent – The motor speed and direction are controlled by

a single channel connected to Input 1. Motor stops when the

input signal is at the center point. Input 2 is not used in this

mode.

Mixed Right – This mode should be selected for the right motor

of the robot differential drive system. Input 1 controls the overall

speed as well as forward/backward movement of the robot. Input

2 controls the left/right or pivot movement of the robot. In right

mix mode, the motor will be slowed down when the robot is

commanded to turn right and vice versa. SW8 must be set to 0.

Mixed Left – This mode should be selected for the left motor of

the robot differential drive system. Input 1 controls the overall

speed as well as forward/backward movement of the robot. Input

2 controls the left/right or pivot movement of the robot. In left

mix mode, the motor will be slowed down when the robot is

commanded to turn left and vice versa. SW8 must be set to 0.

Exponential Mode

SW5

0

1

Off – The speed is linear with the input signal. This is for low to

medium speed motor.

On –The response to input is exponential and thus soften the

control around the center zero speed point. This is suitable for

high speed and very sensitive motor.

Sign-Magnitude

SW6