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.
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Things You'll Need
- (1) relay, recommend Omron MY4 Grainger part#: 3A352 (for 24VDC applications)
- (1) relay base, for Omron MY4, Grainger part#: 5ZJ21
- electrical wire
- wire cutter/stripper
- phillips screwdriver
Instructions
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1
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.
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2
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.
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3
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.
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4
Connect the external M-function finish signal to the red wire in the Hass 4-wire interface.
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5
Connect the input common to the green Haas 4-wire interface cable.
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6
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.
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7
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.
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8
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.
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9
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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Tips & Warnings
As an overview, The Haas indexer has a control box of its own. This is where you will program the positions to which you want the indexer to rotate. When the appropriate M-code is output on the CNC machine, the relay R1 that you added will turn on. It will stay on until the Haas indexer rotates to its programmed position (i.e. position #1). At this time, a relay contact inside the Haas control box will close momentarily. This action will allow the M-function finsih signal to be sent the the input of the CNC machine and the M-code output will shut off, allowing the CNC to continue to the next line of the part program.The next time that same appropriate M-code is fired, the Haas indexes to the next programmed position (i.e. position #2).
You can right-click this picture and "Save Picture As..." to save it to a file. When you open it in your photo editor program, you should be able to read the drawing pretty well.
This Howto discusses a machine with both 24VDC inut and 24VDC output systems. This is common but not necessarily what you have in your machine. Contact your machine builder to verify all power sources before wiring. If you like, you can send me your electrical drawings (info@pinpointcnc.com) and I can assist you with the interface before you begin wiring work.
This is a very complex process that should only be attempted by those who understand the parts and functions of their own machine. Seek help from a professional if you need guidance.
References
- Photo Credit www.silva-tech.com
