Table of Contents
Advertisement
1.8
A/B/Z-phase differential output type encoder
Precautions
This section explains how to connect an A/B/Z-phase differential output type encoder to a servo amplifier. Fabricate the
encoder cable using an MR-J3CN2 connector set as shown in the following wiring diagram.
Page 36 Internal wiring diagram
Use the encoder that satisfies the specifications described in this section. For information on the encoder
specifications (resolution and output specifications), contact the manufacturer of the encoder being used.
A/B/Z-phase differential output type encoder specifications
Each signal of the A, B, and Z-phase of the encoder is output by a differential line driver. Open collector outputs cannot be
used.
The phase differences of the A-phase and B-phase pulses and the pulse width of the Z-phase pulse need to be 200 ns or
more. If the phase difference is less than 200 ns, a signal from the encoder may not be read and a position mismatch may
occur.
The multiply-by-four count method is used for A-phase and B-phase output pulses of the A/B/Z-phase differential output type
encoder.
Homing cannot be performed on the linear encoders that do not have the Z-phase.
The tolerable resolution range is between 0.001 μm and 5 μm. Select a linear encoder that has a resolution within this range.
Encoder
A, B, Z phase
A, B, and Z-phase
A
A
B
B
Z
Z
Phase difference: 200 ns or more
1 pulse of Z-phase = 200 ns or more
1.8 A/B/Z-phase differential output type encoder
1 LINEAR ENCODER
33
1
Advertisement
Table of Contents
