Mitsubishi Electric MELSERVO-J2S Series Transition Handbook page 460

Part 9: Review on Replacement of Optional Peripheral Equipment
8.3.2 Connection with servo amplifier
8.3.3 Points to note for use of the USB communication function
To prevent an electric shock or malfunction of the servo amplifier, follow the instructions below.
(1) Connection of the power supply of a personal computer
Connect the power supply of a personal computer following the procedure below.
(a) When using a personal computer with AC power
1) When using a personal computer whose power plug has three pins or a grounding wire, use a
grounded outlet or ground the grounding wire.
2) When using a personal computer whose power plug has two pins and no grounding wire, connect
the personal computer to the servo amplifier following the procedure below.
a) Remove the power plug of the personal computer from the AC outlet.
b) Verify that the power plug has been removed from the AC outlet, and then connect the servo
amplifier to other devices.
c) Insert the power plug of the personal computer into the AC outlet.
(b) When using a battery-driven personal computer, use the computer as is.
(2) Connection to other devices by use of the servo amplifier communication function
When the servo amplifier becomes charged due to connection to the personal computer and the charged
servo amplifier is connected to other devices, the servo amplifier or the connected devices may be
damaged. Connect the servo amplifier to other devices following the procedure below.
(a) Turn off the power of the devices connected to the servo amplifier.
(b) Turn off the power of the servo amplifier connected to the personal computer, and then verify that the
charge lamp is not lit.
(c) Connect the servo amplifier to the devices.
(d) Turn on the servo amplifier and the devices connected to it.
Servo amplifier
USB cable
MR-J3USBCBL3M
(Option)
CN5
9 - 51
Personal computer
To USB
connector