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17. APPLICATION OF FUNCTIONS
17 - 66
17.3.2 Scale measurement encoder
POINT
Always use the scale measurement encoder cable introduced in this section.
Using other products may cause a malfunction.
For details of the scale measurement encoder specifications, performance and
assurance, contact each encoder manufacturer.
An absolute type linear encoder is necessary to configure an absolute position detection system under scale
measurement function using a linear encoder. In this case, the encoder battery need not be installed to the
servo amplifier. When a rotary encoder is used, an absolute position detection system can be configured by
installing the encoder battery to the servo amplifier. In this case, the battery life will be shorter because the
power consumption is increased as the power is supplied to the two encoders of motor side and load side.
(1) Linear encoder
Refer to "Linear Encoder Instruction Manual" for usable linear encoders.
(2) Rotary encoder
When a rotary encoder is used as a scale measurement encoder, use the following servo motor or
synchronous encoder as the encoder.
Servo motor and synchronous encoder that can be used as encoder
HG-KR HG-MR
Synchronous encoder
Q171ENC-W8
MR-J4-_B_
MR-J4-_B_-RJ
Use a two-wire type encoder cable for MR-J4-_B_ servo amplifiers. Do not use MR-EKCBL30M-L, MR-
EKCBL30M-H, MR-EKCBL40M-H, or MR-EKCBL50M-H as they are four-wire type.
When an encoder cable of 30 m to 50 m is needed, fabricate a two-wire type encoder cable according to
appendix 9.
(3) Configuration diagram of encoder cable
Configuration diagram for servo amplifier and scale measurement encoder is shown below. Cables vary
depending on the scale measurement encoder.
(a) Linear encoder
Refer to Linear Encoder Instruction Manual for encoder cables for linear encoder.
1) MR-J4-_B_ servo amplifier
Servo amplifier
Linear encoder
CN2
MR-J4FCCBL03M branch cable
(Refer to section 16.2.4.)
Encoder of rotary servo motor
Encoder cable
(Refer to "Linear Encoder Instruction Manual".)
CN2 MOTOR
SCALE
Scale
measurement
encoder