Filter
Top Products
Closed Loop Speed Mode
102 AX3500 Motor Controller User’s Manual Version 1.9b. June 1, 2007
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.
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.
P iti F db k
FIGURE 65. Motor and speed sensor assembly needed for Close Loop Speed mode
Speed feedbackSpeed feedback
Analog Tachometer
or Optical Encoder
47kOhm
10kOhm
47kOhm
1kOhm
Max Speed Adjust
10kOhm pot
Zero Adjust
100 Ohm pot
1kOhm
Internal Resistors
and Converter
+5V 14
Ground 5
A/D
Ta c h
Ana 1: 11
Ana 2: 10
Ana 3: 12
Ana 4: 8
FIGURE 66. Tachometer wiring diagram