Wiring: Keeping the Mitsubishi Drives Powered when E-Stop

About

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

Since CNC Bender software monitors the home state as a way to predict servo module health, 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 shown here. (The AL E6 message will flash):

Tools/Parts Needed

14 Gauge THHN stranded wire
Vinyl Insulate Terminal Pin for 14 gauge wire (See 159-1617 Kobiconn Terminals Pin Blue 16-14 at Mouser.com)
Jumper bar (Automationdirect.com DINnectors DN-82J10)
Crimper for terminal pins, screw drivers, diagonal cutters for cutting the jumper bar