Messages

341

General Mach Discussion / Re: G4 versus Sleep

« on: October 06, 2009, 01:15:19 AM »

Since it is milliseconds, have you tried

Code "G4 P100"

Cheers,

Peter?

342

General Mach Discussion / Re: G4 versus Sleep

« on: October 05, 2009, 11:37:55 PM »

Is the time units for G4 set to milliseconds?

Cheers,

peter

343

Modbus / Re: com1 & com2 modbus

« on: September 27, 2009, 05:12:33 PM »

If the ModIO is in a handheld pendant, use a separate RS232 to RS485 converter. If the ModIO is mounted into a CNC controller box then use the ModIO's onboard RS232 to RS485 converter.


If you are putting the ModIO into a handheld pendant as you stated earlier, it would not be very efficient to have the RS232 commms from the computer run up to the ModIO, get converted to RS485 and be sent back down the cable, then to the PLC.

Cheers,


Peter.

344

Modbus / Re: com1 & com2 modbus

« on: September 27, 2009, 07:56:35 AM »

You have 2 options here.

1.  Use an RS232 to RS485 converter and run the PLC and the ModIO off that.
2. Use the RS232 to RS485 on the ModIO and run the PLC off the ModIO's RS485 connectors.

Have a look at these 2 engineering notes;
http://www.homanndesigns.com/EN007-MC01R1.pdf
http://www.homanndesigns.com/EN007-MA02R1.pdf

Cheers,


Peter.

345

Modbus / Re: com1 & com2 modbus

« on: September 26, 2009, 06:15:10 PM »

Hi,

No you can't use 2 com ports in Mach3 with Modbus.

What you can do is use RS485 to talk to the PLC and the ModIO through a single com port. This is how most talk to multiple modbus devices.

The ModIO can use RS232, RS485 two wire, or RS485 four wire.

You can also use the ModIO as a RS232 to RS485 converter as well.

Does your PLC haave a RS485 port?

346

Show"N"Tell ( Your Machines) / Re: Brian's Emco Compact 5 Retro

« on: September 25, 2009, 07:27:18 PM »

Do you know what the voltage and current requirements are for the dc motor?

Hi Dan,

I believe it is 24V. I should have a schematic for the toolchanger somewhere.

Cheers,

Peter.

347

General Mach Discussion / Re: BLDC Motor Control

« on: September 17, 2009, 09:25:15 PM »

A couple of things about PWM signals for speed control.

1. The PWM waveforms are converted to a dc voltage by filtering. The DC voltage should be equal to the ratio of the mark space  ratio multiplied by the supply voltage generating the PWM waveform.

If you have gaps in the PWM waveform, then the dc voltage produced will be less than expected as you are experiencing.

The higher the PWM frequency, the less susceptible tit will be to noise.


The first thing to do is find out why there are gaps in the PWM signal. Solve that and your problem may be fixed.  It sounds like there is a program such as Quicktime interfering with Mach3.

Cheers,

Peter.

348

General Mach Discussion / Re: Going back to Iraq, see ya fellas.......

« on: September 17, 2009, 05:59:08 PM »

Hi Scott,

Best wishes and a safe return.

Cheers,

Peter.

349

General Mach Discussion / Re: Duplomatic turret for Colchester

« on: September 12, 2009, 07:37:48 PM »

Hi,

I've added a number toochanger modules into the ModIO for various turrets. The latest was for this Hercus turret.

http://www.machsupport.com/forum/index.php/topic,11809.msg81230.html#msg81230

The ModIO is controlled vis Modbus ans uses the M6Start macro.

Cheers,


Peter

350

General Mach Discussion / Re: MPG? handwheel?

« on: September 11, 2009, 07:47:59 PM »

Hi,

I know it's not in the UK., But I sell the same MPG for US$55

http://homanndesigns.com/store/index.php?main_page=product_info&cPath=15&products_id=30

Cheers,

Peter.