18
Hardware and Wiring
4th axis HOME INDEX SENSOR connection:
As of 11/15/14, the InTurn™ has inherited a new sensor developed for the InTurn™ Mill Spindles.
This sensor is on a small PC board and required support components are located on the board so a
simple wire hook up is all that is required.
Connect wires from 4
th
axis home sensor to BOB.
Connect the RED sensor power to 5V from the BOB.
Connect the BLACK sensor ground to BOB ground.
Note: for 5V BOB, both sides of the sensor can be fed from the same 5V.
In this case, connect the RED and YELLOW wires both to the 5V supply.
Connect the WHITE sensor output to any available BOB input pin.
Go into the MACH ‘Configure Ports and Pins’ and assign the BOB input pin that was used to the ‘A’
Axis home and c
heck ‘enable’ and ‘active high’.
Remove the 4
th
axis cover plate and rotate the spindle until the tiny
Shutter hole is within the sensor arms.
Move the hole slowly past the sensor and observe the A home LED on
The MACH diagnostic screen. It should light when the shutter hole
passes the sensor.
Note: there are two types of sensors. Those intended for more than 5V operation feature a Solid
State Relay on the switched side. This is a small black 6 pin chip in the center of the PC board. These
Sensors can switch up to 60V and the signal voltage is supplied on the YELLOW (or GREEN) wire
and is switched on and off to the WHITE wire.
The second type of sensor is identical except there is simply a jumper where the small black 6 pin
chip would have been. If the sensor is switching a 5V signal (from a typical BOB that would be used
with MACH3), then there is no need for a relay because the sensor is able to switch a 5V signal.
In all cases, the LED side of the sensor is 5V DC and the BLACK ground wire connected to the
SAME source as the 5V DC power is taken from.
Controller Combo Board Functions
The InTurn™ controller includes a remote circuit board that is typically mounted inside the
CNC electronics enclosure. It is important to have the wires from the BOB to the board as
short as possible. The board is not grounded by the mounting. Provide a separate ground as
shown in the diagram.
This board combines several functions onto one compact unit:
