ON topic- Overcurrent-Overvoltage alarms continued

More symptoms. this is a real puzzle. Getting two random errors. Z-axis OverCurrent, and Y-axis OverVoltage. always the same error for
each axis. X-Y axis drive was completely rebuilt 8 months ago.
Here is the oddity. The y-axis has alarmed twice at the SAME exact X-position...??? It usually occurs after about one-two hours of machine idle time. Mori tech originally said look at the wire harnesses, except they don't move with the table on this machine. then suggested checking the brushes. same as everyone else.
Checked brushes & Y-axis commutator. Brushes look great, commutator looked a little iffy. Cleaned & polished commutator. All brushes were replaced at the same time when the machine was setup.
The Z-axis has alarmed once, overCurrent, yet at the same time as the Y-axis Overvoltage error. Huh? How is that related? One time Z-axis by itself as OverCurrent.
All the calibration voltages check out O.K. rotary Phase converter, Wild leg is 10-15V higher than input legs.
ca
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More symptoms. this is a real puzzle. Getting two random errors. Z-axis OverCurrent, and Y-axis OverVoltage. always the same error for each axis. X-Y axis drive was completely rebuilt 8 months ago.
Here is the oddity. The y-axis has alarmed twice at the SAME exact X-position...??? It usually occurs after about one-two hours of machine idle time. Mori tech originally said look at the wire harnesses, except they don't move with the table on this machine. then suggested checking the brushes. same as everyone else.
Checked brushes & Y-axis commutator. Brushes look great, commutator looked a little iffy. All brushes were replaced at the same time when the machine was setup.
The Z-axis has alarmed once, overCurrent, yet at the same time as the Y-axis Overvoltage error. Huh? How is that related? One time Z-axis by itself as OverCurrent.
All the calibration voltages check out O.K. rotary Phase converter, Wild leg is 15V higher than input legs.
ca
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Put the wild leg in the center. Ex: L1, L2, L3 (incoming), put the wild leg on L2. Hopefully, the machine is wired so that all wires are in-line to the drives, L1 to R1, L2 to S1, L3 to T1 (or maybe U1, V1, W1). If not, the drives should take care of the phasing, so you should be able to put the wild leg in the center.
Matt
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