Closed Loop Speed Mode

Using Optical Encoder for Speed Feedback (AX2850 only)

Digital Optical Encoders may be used to capture accurate motor speed. This capability is only available on controllers fitted with the optional encoder module.

Detailed information on how to install and wire optical encoders is provided at “Installing,

Connecting and Using the Encoder Module” on page 71.

If using optical encoders, omit the Analog Tachometer discussion in this section and resume reading from “Control Loop Description” on page 100. Optical Encoders require special handling. See “Installing, Connecting and Using the Encoder Module” on page 71 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 62 shows a typical motor and tachometer or encoder assembly.

Analog Tachometer or Optical Encoder

Speed feedback

FIGURE 62. Motor and speed sensor assembly needed for Close Loop Speed mode

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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.

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AX2550 Motor Controller User’s Manual

Version 1.9b. June 1, 2007

Page 98
Image 98
RoboteQ Using Optical Encoder for Speed Feedback AX2850 only, Tachometer or Encoder Mounting, Tachometer wiring