[Al_The_Man]

What I like to do in a case like this is to identify the analogue input to the drive, if this is easily done, then the drive/motor/tach can be tested by using a +-battery box made from two 9v batteries and a 10k pot.
Disconnect the analogue input and connect the battery box. you should be able to run the motor back and forth smoothly.
If you are able to do this then, the problem is in the control/feedback or parameters.

For the battery box, both the 9v are connected in series and the junction point is used as the common, the outer ends of the batteries are each connected to the outer ends of the pot. the two leads you use are the common and the slider of the pot to give you +-9vdc.
Al.

[gar]

071011-1831 EST USA

ralph@nes:

Along the line that Al suggested I would get a 12 to 20 VDC source with current limiting of about 1 A. Apply this current limited source to the armature with one polarity, and then the other. This is low enough power to protect the motor under stall conditions and you can see if there smooth and approximately equal speed in both directions. If not there may be a mechanical problem.

How can you approximate a constant current source? Put a series resistor in line with the load. For 1 A locked rotor current at 20 V the value of R is 20 ohms at 20 W. Same resistor and 20 V source and at 10 V across the motor armature this will be 1/2 amp. (10 V and 20 ohms).

On our 5C unit light axial force will stall the motor.

You must get all of the many parameters correct for the unit to work.

The DC brush type indexers will work on the machines with DC brush type servos. They also work on brushless machines with an adapter from the brushless driver. There is no backwards compatibility of brushless indexers to brush type machines.

If you run the above test make sure you never apply any voltage to the encoder leads when you have the higher voltage (12 V or above) around the cable.

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[gar]

071011-2135 EST USA

SORCHEROR:

HAAS did not supply machines with brushless motors until some time after 1993 and before 1996. Without an adapter you can not run the brush motor on a brushless drive.

HAAS had a bad design in my opinion on the brush type drives because if carbon produced a shunt to ground resistance below about 1 megohm it was likely to fail a drive.

In the HAAS you either have all brush type drives or all brushless because the DC power supply is different. The brushless use the same power supply as the spindle motor.

A brush type motor will not run if directly connected to a brushless drive. Furthermore the cabling has to be different.

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