Millport VMC1660 Centroid Upgrade (Leadshine EL7)

[KreiderMachine]

Okay,

At the head of the mpu.plc on this installation it says "PLC program compiled by MPUCOMP 5.22 Rev0
Compiled Dec 3 2024 from Centroid-Mill-Standard-Hickory.src

I have no idea whether it will be necessary to modify this or not. If it is necessary, I'll need to lean on your input fairly heavily.


Next issue:

Our machine has a spindle chiller. I have read the notes concerning the spindle cooling fan, but have found nothing about the chiller on either of the schematics I have.

The pertinent parts of our original schematic are here:

(CNT4/OCR4 are concerned with the chiller.)

I have begun rewiring the e-stop contactor according to the new schematic, but the other three are still basically intact with the original wiring. (I removed from terminal blocks, and labelled each wire.)

What should I do here?

[centroid467]

In the pictured schematics, it looks to me like that spindle chiller would be turned on by CNT4 when CNT1 is closed (not in E-stop) and PLCIO2 H7 OUT 30 is closed.

To replicate that on S15259, I would add a CNT5 and OCR4 following the pattern of the CNT2/OCR2 block. Of course, you'll need to put the right voltage for the chiller to the L1-L3 terminals and use suitable fuses/circuit breakers. I think the rest of the wiring for the spindle chiller could go as in the pictured schematics - you'll have to pick an unused input for the "At Pressure" switch and an unused output to control the contactor.


As a side note, the PLC program you have installed currently seems to be the Hickory Wizard version. This will require some configuration once you get the Hickory connected to the CNCPC but it will be able to handle the umbrella ATC and the spindle chiller.

To enable the umbrella logic, you will need to set CNC12 parameters 6, 160, and 164 to 1. You'll also have to drag and drop the appropriate input and output settings to the corresponding inputs and outputs.

It looks like the spindle chiller input is "ChillerOk" and the output is "SpindleChillerOut".

[KreiderMachine]

Ok, thank you.

I'll need a little clarification on the last two lines when the time comes, but I think this gives me enough to keep wiring for now.

-H

[KreiderMachine]

Update time:

Old components are mostly wired in at this point. Pendant is made, and touchscreen is mounted. Work continues on servo mounts and drive pulleys.
Today begins wiring of the contactors in earnest.

[KreiderMachine]

Seeking some help with making the connections for the inverter.
We have a Mitsubishi A500 Inverter driving our spindle. The labels are not 'one to one' with the wiring schematic and I have been unable to resolve all of them. I have included the basic schematics for inverter connections from the A500 manual, as well as the original wiring schematic, and the modern one for the Hickory. The A500 manual should also be attached as a .pdf.

Unresolved connections are:

Orient
Analog Out
Analog Out Com
Zero Speed Out
Oriented

Making steady progress otherwise.
I have retained the original fuse blocks for 110v and 24v transformer primaries, as well as for the Carousel Motor. (also have left CNT3 alone with fuses instead of adding OCR3) If any of these decisions are strongly ill-advised, please let me know. It saves me some trouble and minor expense.

Thanks!

[cncsnw]

See TB112 for typical Centroid ATC configuration of a Mitsubishi A500-series drive:
https://www.centroidcnc.com/dealersuppo ... ds/112.pdf

Typically, "RH" was used for the orient command; "FU" was used for the orient-complete signal; and "RUN" was used for the zero-speed signal.

TB112 includes the parameter settings to make those terminals work as desired.

TB112 is from an earlier generation, where the spindle drive fault signal was assumed to be normally open (hence the advice to use terminals A and C, where you will want to use B and C). It also predates spindle load meter support, so there is no mention of analog output from the VFD to the PLC.

It looks like terminal AM is the analog voltage output, sharing terminal 5 as its analog common. Setting Pr.158=2 would make the AM terminal report output current (motor load).

[KreiderMachine]

My original schematic doesn't show analog input from the vfd, either, and the original schematic shows a handwritten change from terminal B to A for the orange wire. Would this suggest that someone determined that my inverter was the older one, or should I still wire it as you described? (My exact part number is FR-A520-7.5k-NA)

[KreiderMachine]

Ok, I went ahead and wired as you described for now, using terminal "B" for the fault and "AM" for analog input to the hickory.

Attached are some modifications to the schematic provided earlier to resolve some wiring conflicts with the ATC, but now I notice that these changes result in the "inverter orient" wire being connected to inputs with a common "24v dc com" (H5 In 21-28) instead of common 24v dc+. (H2 In1-H4 In20, H5 In29-32)

Seems like this could be a problem?

-H

[KreiderMachine]

I may need a quick primer on how these plc inputs work.

I'm wiring up the spindle chiller and CNT5/OCR4 as talked about earlier. I have an open output to control the relay (2-5NO) and will supply 24vac to 2-5 Com.

For connecting the "at pressure" switch input, it looks as though original configuration took 24vdc from an input common buss (H4 com3) on the plcio2 and returned it to an input (H3-28) with an adjacent dc- buss. So it occurs to me that I don't understand the relationship between these comm busses and the inputs they relate to.

Forgive me if this is fundamental, but it occurs to me that it might relate to my previous post as well.

Thanks!

[cncsnw]

PLC inputs are current sensors.

A PLC input is "on" if current is flowing through it, in either direction.

On any post-2009 Centroid board except Acorn, inputs can be either current-sourcing (DC current flows out of the input terminal, through the switch, to 0V common); or they can be current-sinking (current flows from +24V, through the switch, to the input point).

For current-sourcing inputs, you connect +24V to the input bank common, and you connect 0V to the switch common.
For current-sinking inputs, you connect 0V to the input bank common, and you connect +24V to the switch common.

If needed, you can also use 5V or 12V instead of 24V, by installing different SIP resistors on the Centroid PLC board.