MELSERVO-J4: High-Precision Servo System for Global Industrial Automation
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Detailed Product Description
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MELSERVO-J4: High-Precision Servo System The MELSERVO-J4 is a high-precision servo system engineered for
global industrial automation applications. Boasting an innovative
high-speed servo control architecture that delivers a 2.5kHz
response frequency, coupled with a high-resolution absolute
position encoder supporting 4,194,304 pulses per revolution, it
enables both high-speed, precise operation and smooth rotational
performance. This system integrates intelligent features including
one-touch tuning, Advanced Vibration Suppression Control Ⅱ, and
robust filters, which automatically adjust servo gains, suppress
vibrations across multiple frequency bands, and expand the scope
and quantity of mechanical resonance suppression
filters—effectively cutting equipment tuning time and enhancing
trajectory control accuracy. Fully compliant with global industrial
standards such as IEC/EN, the MELSERVO-J4 is ideally suited for
diverse sectors including semiconductor manufacturing, robotics,
CNC machine tools, and packaging machinery. Product Features
Product Advantages
Core Technical Parameters
Servo Drives (MR-J4 Series)
200V Series Models (Partial)
400V Series Models (Partial)
Rotary Servo Motors (HG Series)
Application Fields
Common Issues & Troubleshooting Q: The drive throws AL.E6 overload fault right after startup, and
the motor won't turn. What's wrong? A: It's mostly mechanical jamming or overloaded load. First, power
off and manually rotate the load shaft to check for abnormal
resistance—inspect guide rail/ball screw lubrication and coupling
concentricity. Then check if the inertia ratio exceeds 15 times; if
yes, reduce the load or switch to a higher-power motor. Also, the
overload threshold in parameters might be set too low—use MR
Configurator2 to reset PA05 to the default 150%. Q: AL.52 encoder error pops up suddenly during operation, and the
motor stops abruptly. How to fix it? A: First check the encoder cable—cables in drag chains are prone to
breakage, replace it with a high-flexibility shielded cable (H
type). Then clean the encoder connector to remove oil stains and
re-plug it firmly. If that doesn't work, reset the encoder with
PA03=1001. If the fault persists, the encoder is probably damaged
and needs replacement. Q: The motor vibrates and makes loud noise during operation,
especially at high speeds. How to solve this? A: First check the mechanics—see if bearings are worn or
lubrication is sufficient; replenish grease every 50,000 cycles.
Then adjust parameters: lower the rigidity parameter Pr0.07
slightly and run the one-click auto-tuning in MR Configurator2 for
optimization. If resonance is obvious, enable the vibration
suppression function, and check the load inertia matching degree at
the same time. Q: AL.20 main circuit undervoltage fault is triggered frequently,
but the measured power supply voltage is normal. Why? A: It's mostly caused by loose power cables or insufficient wire
gauge, which leads to large voltage drop under high current.
Inspect if the main circuit terminals are oxidized or loose, and
replace the cables with thicker ones. In addition, add a voltage
stabilizer or reactor if the power grid fluctuates a lot—it can
reduce such alarms effectively. Q: The drive gets extremely hot and even throws overheating warning
(91.1). What to do? A: First check heat dissipation—ensure the heat sink is free of
dust and well-ventilated, don't mount it too close to other
heat-generating equipment. Then check if the cooling fan is
working; replace it if it's broken. If the drive runs at full load
for a long time, optimize the motion curve to reduce continuous
overload duration, or increase the overload threshold appropriately
(but don't exceed the limit too much). Q: Communication with PLC keeps dropping and AL.8D CC-Link IE
communication error is reported. How to troubleshoot? A: First verify communication parameters—baud rate, station number
must match those of the PLC. Then check the communication cable:
use shielded cables, keep them away from high-voltage lines, and
ground both ends properly. Finally, check the firmware
versions—update both the drive and PLC firmware to the latest, and
try replacing the communication module if the problem still exists. Q: The motor runs but can't position accurately, with repeated
position deviations. How to fix it? A: First check mechanical backlash—see if the ball screw or gearbox
is worn; adjust or replace them if needed. Then calibrate the
encoder and perform origin return with MR Configurator2. In
addition, check if the pulse command is lost—add a ferrite core
filter if there's strong interference, and ensure the shielded
cable is grounded correctly. Q: The regenerative resistor always gets overheated and even burns
out. How to solve this? A: This is caused by excessive regenerative energy during
deceleration. First confirm if the regenerative resistor power is
sufficient—replace it with a higher-power one if not. Then check
parameter Pn600 and set the regenerative braking function
correctly. For loads with frequent start-stop or large inertia, add
a regenerative braking unit—it will work much better. |
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| Product Tags: Mitsubishi MELSERVO-J4 servo system high-precision servo drive motor industrial automation servo motor |
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