Dyna Mite with Meldas 520

[cncfirst]

I just purchased a Dyna 4800C with a Meldas 520 control. The machine has a 20 Arm style ATC. The problem I have is that the magazine(MG) value on the control is always opposite that of the Dyna.
If I reset the tool registration so that MG 1 is Tool 1, etc.
I get this issue when doing a MDI tool change.
Example:
MG value on control says 20 for magazine pot 1
MG value is 19 for mag pot 2
MG value is 18 for mag pot 3
etc.
It appears that the Magazine is running in reverse.
This problem does not allow the tools to be found in the magazine properly.
Any Suggestions???

[cncfirst]

After looking into this problem some more. I have determined that the ATC is rotating opposite of how it should. It has two buttons to control rotation but they drive it the wrong way.
CW button makes it go CCW.
CCW button makes it go CW.
One person said it could be the 3-phase electrical connect is wrong.
We just installed this machine a few weeks ago.
The xyz servos are running correct.
Does anyone know if I can reverse the ATC motor in the PLC settings or at the motor itself?
Thanks

[Caprirs]

There's a good chance the ATC motor is 3 phase. A clue that the main power to the machine might need phases swapped is the rotation of the coolant pump motor. If the machine was working correctly for the previous owner, then no changes to wiring inside the cabinet would be required.

Axis servos and spindle have 3 phase to the amps but rotation is always correct regardless of how the main power is connected.

[Al_The_Man]

There is a possibility the coolant pump is 1ph, in that case you may not be able to tell from this, as it would still run correctly, but if the ATC motor is direct three phase, then as mentioned, you only need to swap any two of the 3 phases, either at the motor or at the disconnect.
Al.

[Caprirs]

I'm pretty sure those 4800Cs ran 3 phase coolant pumps. It's the tool magazine motor I'm not sure about.

The 4800C wasn't really a Dyna, just a rebadged Johnford. Dyna bought something like 30 of them because they had the swing arm style ATC and then painted them Dyna colors and put Dyna name plates on. Dyna's own machines had the umbrella/carousel type tool changer. On the umbrella/carousel 4800s, it was a single phase 120VAC motor.