How to Interface a Haas Indexer to a CNC Machine (Haas 4-wire interface cable)


If you are familiar with using a Haas indexer and understand the safety precautions needed to be taken around CNC work, you should be able to electrically connect a Haas 4-wire interface cable effectively to a CNC machine. Depending on the machine you are working with, you may need to contact your machine provider or manufacturer to verify the power sources you are working with. In most common machines, you will have a 24VDC input and output system.

Ensure that all electrical, hydraulic and pneumatic power sources are switched off before starting anything. Turn off the main breaker on the machine as well. There should be no power in the electrical cabinet whatsoever.

Connect the necessary cables from the machine to the Haas control box, which will depend on the type of machine you have. Connect a line to the indexer brake for the compressed air movement.

Locate the following four components using the machine’s electrical schematic: the external M-function finish signal, the input common (which may be called +24 or 24NC), an M-code that is not being used with anything else so it can be used with the indexer, and the output common (which is usually the same wire used as the common for all the machine’s relays). If you have trouble locating these components or are unsure of which ones to use, consult your machine provider or an experienced CNC mechanic.

Connect the external M-function finish signal to the red wire in the Hass 4-wire interface.

Connect the input common to the green Haas 4-wire interface cable.

Add a relay to the CNC machine if it does not already come with the Haas indexer. If this is the case, you can use an Omrom MY4 relay and use a 14-pin base for it as well. This can be used with all machines using a 24VDC output system.

Connect the output common and the M-code output signal to the coil terminals of the relay found on the base, which should be terminals 13 and 14. When the M-code is triggered, the relay will turn on.

Connect the black and white wires found in the 4-wire interface to a normally open set of contacts on the relay, which you added in Step 6 by using the screw terminals on the base of the relay.

Connect the black wire to the white wire to start the indexer rotation once everything has been fully and accurately connected, powered and programmed for use. To connect the two wires, the normally open contacts on the relay will need to be closed when the coil is switched on by the M-code output signal.

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