Wiring: Keeping the Mitsubishi Drives Powered when E-Stop

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On some older benders, the Mitsubishi drives power down when E-Stop is pressed. This approach causes the Feed and Rotate axes to loose the HOME status in the I2T modules when the E-Stop is pressed.

So with newer CNC Bender software, it is necessary to keep the Mitsubishi drivers powered - even when the E-Stop is activated.

WARNING! Only experienced electrical technicians should perform what we describe next. There can be high voltages and currents of electricity flowing through the electrical panel.

STEP 1: Check the State of the Drives at E-Stop

Set MASTER POWER ON, Press the E-Stop, then examine the drives LED screens. If they are blank, then the drives are off, and you will need to perform this wiring change during a CNC Bender upgrade. This drive is off. The screen is black.

STEP 2: Find Three Wires

Find the three wires entering the top left side of the white fuse buse to the left of the Feed drives.

• The wires will be labelled 3L1, 3L2, and 3L3.
• Trace those wires to the M-2 contactor. (Find the other end.)
  

STEP 3: Reroute the Wires

• Reroute these three ends to the top of the M-1 contactor.
• Be sure to place the wires into the proper terminal point (1, 2, or 3).
• If there are other wires in the bottom of the M-2 contactor, then leave them in place.
• Leave the wires that are in the top of M-1 in place. (Double up the 1L1, 1L2, 1L3 and the three "3" wires.)

STEP 4: TEST

• Apply power to the bender (at the main breaker switch outside the bender)
• Press the E-Stop
• The drive should stay powered like this:

STEP 3: Run the Mitsubishi RESET Wire To M-2

• Run wire from point 14 in the CN1B cable on the Mitsubishi drives to point 21 of the M-2 connector.
• There is a cable running from both the Feed and Rotate drives. Point 14 from both cables must be found and used to connect to the M-2 contactor.
• If the cable is a stock Mitsubishi cable, then there will be many wires in the cable. Wire 14 will be white with a green stripe
• If there is no wire 14, then you will need to run a small wire (24 AWG) into the connector at the drives. The connectors use solder cups. Solder the wire into point 14 at the CN1B connector.

Finished! - Circuit Created

This is an image that shows the circuit created. Click on the image to see a closeup.

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