3 steps forward and one back may be indicative of 1 blown transistor on a axis.
You may have more.
There was a special transformer for a 208V machine.
But the 230 machine expected 230VAC. Not more.
What is your power in?
According to the maintenance manual (if my memory is correct) the normal voltage range of T2 is 54 to 63 VAC. Current is set to 8 amps DC by the ACC board but measured at the DC axis drive fuses (12, 13 and 14).
Do not attach or remove a meter to these drives trying to measure current unless the drives are off. All 4 transistors on a block must be the same.
Get a maintenance manual. It explains how the logics and drives work in great detail as well as having a good trouble shooting chapter.
George
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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