RoboteQ AX3500 Using Optical Encoder for Speed FeedbackDigital Optical Encod, Tachometer wiring

Closed Loop Speed Mode

Using Optical Encoder for Speed FeedbackDigital Optical Encod-

ers may be used to capture accurate motor speed. This capability is only available on con- trollers fitted with the optional encoder module.

Detailed information on how to install and wire optical encoders is provided at “Connecting and Using the Encoder Function” on page 77.

If using optical encoders, omit the Analog Tachometer discussion in this section and resume reading from “Control Loop Description” on page 104. Optical Encoders require special handling. See “Connecting and Using the Encoder Function” on page 77 for a detailed discussion.

Tachometer or Encoder Mounting

Proper mounting of the speed sensor is critical for an effective and accurate speed mode operation. Figure 65 shows a typical motor and tachometer or encoder assembly.

Analog Tachometer or Optical Encoder

Speed feedback

FIGURE 65. Motor and speed sensor assembly needed for Close Loop Speed mode

P iti F db k

Tachometer wiring

The tachometer must be wired so that it creates a voltage at the controller’s analog input that is proportional to rotation speed: 0V at full reverse, +5V at full forward, and 0 when stopped.

Connecting the tachometer to the controller is as simple as shown in the diagram below.

1kOhm

Zero Adjust 100 Ohm pot

1kOhm

	+5V 14
Max Speed Adjust	Ana 1: 11
10kOhm pot
	Ana 2: 10
	Ana 3: 12
Tach	Ana 4: 8

Ground 5

Internal Resistors and Converter

47kOhm

A/D 10kOhm

47kOhm

FIGURE 66. Tachometer wiring diagram

102 AX3500 Motor Controller User’s Manual Version 1.9b. June 1, 2007