When You Use An Encoder Cable Longer Than 50M In Cable Length For A Long Wiring - Mitsubishi Electric MELSERVO-J2S Series Manual

２.６.７ When You Use an Encoder Cable Longer than 50m in Cable Length for a Long Wiring
(Secondary Replacement or Package Replacement)
If you use a long-distance wiring with the cable length between the amplifier and the motor exceeding
50m, please consult us because you need an encoder conversion cable on the motor side (this is a special
accessory). You need to change the parameter settings. Set up the parameters as listed in the table
below. (Notes 1, 2, and 3)
Parameter No. Setting Item
Type A
PC22
Function
Selection C-1
Type B
PC04
Note 1 When the MD and MDR Signals Are not Transferred to the Existing Encoder Cable
Your existing encoder cable may not be compatible with a long-distance cable arrangement (the
MD and MDR signals are not transferred). If this is your case, you need to use a new long-distance
encoder cable for MR-J4.
Note 2 When you are going to replace the current one with the HG-KR/MR motor, if your existing cable
exceeds 30m, you need to make the above-mentioned setting.
Note 3 Precautions for the Case Where the Encoder is Supplied with Power from an External Power Source
(5V DC)
If your current encoder cable is a long-distance cable, the power source of the encoder (5V
DC) may be supplied from an external module. If this is your case, replace it and pay attention
to the following precautions.
・If yours is a type that does not have insulation between the input and the output, the influence
of noises may be large. So you may need some anti-noise measures when replacing your module.
・Check that the voltage supplied to the encoder is 5.0V±3% at the encoder connector and that
the output current is 300mA or larger.
・Keep the wiring between the external power source and the encoder as short as possible.
・You need to follow different processes to turn on servo amplifier and encoder power.
Power Source of Servo
Amplifier
Power Source of
Encoder
* Every time you turn on the servo amplifier, reenergize the encoder at the timing shown in this
chart. If you do not reenergize the encoder, encoder initial communication data error 1 (AL. 16.
1) occurs.
Setting
Initial Value Setting
0□□□h 1□□□h
OFF
OFF
0.2～1s
２-４９
2 － 49
Description
Selection of the encoder cable communication type
0: 2-cable type
1: 4-cable type
* If you do not correctly set up this parameter, encoder initial
communication data error 1 (AL. 16. 1) occurs.
ON
ON
OFF
OFF
2～5s