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« on: November 14, 2014, 08:43:53 PM »
Hi all.
I need HELP… I have been diagnosing a glitch in my CNC for weeks now and am completely stumped.
I'm having a regular fault with my X axis only.
I have spent a bit of time trouble shooting the problem and changing over parts, cables, adjusting settings and so on but can get it sorted.
Today I bought a rather expensive UPS, the type that isolate the input from the output as I though there could be an interference issue going on between the power supplies and my smooth stepper + Break out board.
This didn’t help unfortunately.
Background and parts: The machine is a rebuild from an old analogue system, I’m using identical setups on the X and Z with an AC servo on the Z. X has big issues, Y has no issues whatsoever and Z is fine.
Break out board: CNC4PC C32
Smooth steeper, USB To laptop
Running full version of Mach 3
X&Y Power supply: 48V 12A
X&Y Servo Controller: DG4S
Motor: Brushed DC Servo
Encoder: AMT103
What’s going wrong: The X axis faults with movement, slow, fast with no load it faults and stops responding to Mach 3 inputs for a second or two. Once things stop physically moving it starts up again and responds to inputs. Mach hasn’t registered the fault had has continued to move in the program.
The X setup works flawlessly in the servo configuration software and has no problems moving fast, slowly or accurately. The fault only occurs when controlled through the breakout board and smooth stepper.
What I’ve tried to resolve it:
Changing drivers: No change
Changing Encoders: No change
re running leads: No change
Using the Y output on breakout board and reconfiguring: No change
Powering all the low voltage, sensitive stuff with an isolated UPS: No change
Updating firmware: No change
I think it’s very much an X setup problem but not between the servo controller and the motor. That leaves the BOB + Smooth Stepper and the X setup causing interferences.
So yes, I’m stumped… If you know what’s going on please let me know.
Regards,
Dave
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