RoboteQ AX3500 Wiring Limit Switches Without Encoders, Effect of Limit Switches, Motor 1 Fwd

Wiring Limit Switches Without Encoders

When the switch is activated, the module’s input is pulled to 0V.

It is recommended that a voltmeter and/or oscilloscope be used to verify that the right volt- age levels are created as the encoder rotates and the switches activate.

You may also use the Encoder setup/test function in the Roborun utility (see “Encoder Testing and Setting Using the PC Utility” on page 87). If the wiring is correct, the counters should increment/decrement as the motor rotate. The switch indicators should be always off unless the switches are actually activated.

Wiring Limit Switches Without Encoders

If no encoder is used, the Encoder Module’s inputs can be used to wire limit switches directly with solely a pull-up resistor as shown in the diagram below.

5V Out

4.7kOhm 4.7kOhm 4.7kOhm 4.7kOhm

Ch B In

Ch A In

Ch B In

Ch A In

8 - 4

5

6

1Encoder Input

SW1

SW2

SW3

SW4

GND

7 - 3

FIGURE 54. Signals seen by encoder using multi-levels and limit switches

Effect of Limit Switches

Each pair of limit switches will stop the motion of a given motor in a given direction. This will have the effect of stopping the motor when a limit is reached while allowing motion in the other direction, away for that limit.

TABLE 15. Effects of Limit Switches 1 and 2 on Motor 1

SW1	SW2	Motor 1 Fwd	Motor 1 Rev
OFF	OFF	Allowed	Allowed
ON	OFF	Stopped	Allowed
OFF	ON	Allowed	Stopped
ON	ON	Stopped	Stopped

AX3500 Motor Controller User’s Manual 83