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Closed Loop Speed Mode
124 AX2500/2850 Motor Controller User’s Manual Version 1.7. February 1, 2005
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 the AX2850 or AX2550 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 131.
If using optical encoders, you may omit the Analog Tachometer discussion in this section
and resume reading from “Control Loop Description” on page 127. Optical Encoders
require special handling. See “Installing, Connecting and Using the Encoder Module” on
page 131 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 74 shows a typical motor and tachometer or encoder assembly.
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.
Tachometer or
Optical Encoder (AX2850 & AX3500 only)
Speed Feedback
FIGURE 74. Motor + tachometer assembly needed for Close Loop Speed mode