Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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17 APPLICATION OF FUNCTIONS
17.1 Scale measurement function
Scale measurement encoder
• 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.
Linear encoder
Refer to "Linear Encoder Instruction Manual" for usable linear encoders.
To use the scale measurement function in the absolute position detection system ([Pr. PA22] = 1_ _ _), an absolute position
linear encoder is required. In this case, you do not need to install the encoder battery to the servo amplifier for backing up the
absolute position data of the load side. To use a servo motor in the absolute position detection system ([Pr. PA03] = _ _ _1),
the encoder battery must be installed to the servo amplifier for backing up the absolute position data of the servo motor side.
Rotary encoder
When a rotary encoder is used as a scale measurement encoder, use the following servo motor or synchronous encoder as
the encoder.
Use a two-wire type encoder cable for MR-J4-_GF_ 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 the following section.

Page 606 Two-wire type encoder cable for HG-MR/HG-KR
To use the scale measurement function in the absolute position detection system ([Pr. PA22] = 1_ _ _), the encoder battery
must be installed to the servo amplifier for backing up the absolute position data of the load side. 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.
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.
■ Linear encoder
Refer to Linear Encoder Instruction Manual for encoder cables for linear encoder.
• MR-J4-_GF_ servo amplifier
Servo amplifier HG-KR HG-MR Synchronous encoder
Q171ENC-W8
MR-J4-_GF_
  
MR-J4-_GF_-RJ
  
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