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Connecting and Using the Encoder Function
82 AX3500 Motor Controller User’s Manual Version 1.9b. June 1, 2007
Important Warning
When a limit switch is activated, the encoder signal that is shared with the switch is
no longer visible by the encoder module, and pulse counting and speed measure-
ment stops.
Wiring Optional Limit Switches
If limit switches are needed by the application, additional circuitry is required in order to
create a multi-level signal that shares the encoder and the switch information. The figure
below shows the electrical diagram of the required wiring.
Using this circuit when the switch is open, a 0V (low-level) output from the encoder goes
through a 1k and 4.7k voltage divider, thus creating a voltage that will never be below 0.8V
at the encoder module’s input.
2.5V
0.5V
Signal on Channel A or B
Quadrature Signal
Switch Detect Signal
FIGURE 52. Signals seen by encoder using multi-levels and limit switches
Encoder
SW1
SW2
Encoder Module
1kOhm
GND
5V Out
Ch A In
Ch A
Ch B
Ch B In
5V
GND
1kOhm
4.7kOhm
4.7kOhm
FIGURE 53. Signals seen by encoder using multi-levels and limit switches