Needs Pictures: 0
Results 16 to 30 of 39
Thread: Tig pedal for a poor man
-
17th Dec 2019, 07:30 PM #16Diamond Member
- Join Date
- Jun 2010
- Location
- Canberra
- Posts
- 1,322
-
17th Dec 2019, 09:38 PM #17Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
18th Dec 2019, 01:33 PM #18Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
Odd; I pulled the cover and there are definitely only 2 wires for the switch and 2 wires for the amperage control.
Looking hard at the amperage control it looks like it’s a factory thing too as I cannot see any solder on the back of the 7 pin plug and the wires to the board are also tidy.
Looking online many people quote you cannot add a pedal to the Unimig DC 200 Razor for some reason but when I look in the manual it clearly states you can.
Don’t want to be playing around with it either in case I fry something.
It looks like my best bet is to buy a torch with amperage control built in and see how that works.
Pics show:
Rear of connector
3 pin connector (this is for red/green) appears one of the pins is unused
2 pin connector on top board (red/black)
Closer pic of unused and unsoldered pins
-
19th Dec 2019, 02:24 AM #19Most Valued Member
- Join Date
- May 2011
- Location
- Murray Bridge S Aust.
- Age
- 71
- Posts
- 5,942
Does your manual give a wiring diagram????
KrynTo grow old is mandatory, growing up is optional.
-
20th Dec 2019, 07:21 AM #20Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
20th Dec 2019, 07:44 AM #21Most Valued Member
- Join Date
- Nov 2017
- Location
- Geelong, Australia
- Age
- 57
- Posts
- 2,651
If there's only 2 wires on the amperage control then good chance it's just the wiper and one other on the pot.
Steve
-
20th Dec 2019, 02:32 PM #22Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
21st Dec 2019, 02:24 PM #23Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
I have the switch worked out. Managed to grab a foot pedal momentary switch from Jaycar and made a simple foot switch. Connected via pins 1/2 and it works flawlessly.
Wow do I love this TIG machine. It’s in another league welding with HF start, having pre/post flow and pre/post amperage.I also had a go with pulse which is also super cool to use. Can’t wait to get more time on it and improve my welding.
To progress the proper foot pedal I’ve bought a torch with amperage control. Also means I have a 26 torch here when I need it as I’m currently using a 17 torch. Having the amperage control with the torch will let me see if it works with the machine, and if it does I can hopefully test the torch to see how it’s working. I’ve also purchased a 10k potentiometer to do some testing if required.
-
22nd Dec 2019, 08:41 AM #24Most Valued Member
- Join Date
- Nov 2017
- Location
- Geelong, Australia
- Age
- 57
- Posts
- 2,651
I don't have a pedal so if I need to I use the downslope as a form of current control.
Release the torch trigger and the current starts to drop. Press it again and current comes back up to full. You can get pretty reasonable control by how quick you cycle and how much you let the current decay.
Steve
-
22nd Dec 2019, 10:51 AM #25Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
22nd Dec 2019, 05:59 PM #26Diamond Member
- Join Date
- Aug 2006
- Location
- Melbourne
- Posts
- 1,105
You can pick them up a lot cheaper than that, might just need to change the wiring/plug to suit your machine.
https://www.ebay.com.au/itm/TIG-Weld...frcectupt=true
-
22nd Dec 2019, 08:21 PM #27
I've got a pedal with a 5 pin amphenol plug, and a min/max pot on the side (effectively controlling the starting amperage and max pedal depression amperage).
Will upload a ruff'n'dirty wiring diagram of it when I can. Maybe even get some electrical help on what's actually going on with it.
-
22nd Dec 2019, 09:40 PM #28Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
23rd Dec 2019, 08:36 AM #29
Here's what I've found for a 5-pin foot controller.
This one is a bit different, as it has 2 pots on the side of the pedal that allow the operator to dial in a minimum 'starting amperage' and a maximum amperage at full pedal travel. I'm deconstructing it as it is not working properly- I think I narrowed it down to a dodgy linear pot.
Connector is a amphenol 5 pin. FWIW a quarter turn engagement type.
Pin layout 1-5:
1) Yellow/Green tracer - HF start (ignition) switch (NO normally open)
2) Purple - HF start (ignition) switch (NO normally open)
3) Orange - goes to pin 2 on the slide pot (the wiper)- this is the pot that is operated as the pedal is depressed.
4) Black- goes to the 'max amperage adjustment' pot pin 1.
5) Blue- goes to the 'max amperage adjustment' pot pin 3 (low to max indicates position of pin on the pot relative to the way it is operated in the device). Pin 2 on these 2 adjustment pots are the wiper.
Question I have- Hoping to check as I'm probably wrong
1) Would it be low or high return voltage to the machine that indicates a high welding current? Is there any hint in the way this unit above is wired?
2) I think the way it works is that the black wire from machine pin 4 feeds the max pot (pin1), and the voltage drop at full length of the wiper (max pin 3) is fed into pin 1 of the MIN pot via the red wire. MAX and MIN pot wipers feed voltage to each side of the pedal control slide pot (pin 3 and 1 respectively), with pedal actuation giving a voltage signal to the machine control board (ie an amperage setting) via the ornage wire (machine PIN 3).
-
23rd Dec 2019, 04:32 PM #30Diamond Member
- Join Date
- Jun 2010
- Location
- Canberra
- Posts
- 1,322
I don't quite get what pin 5 connects to?
Similar Threads
-
Poor Mans DRO
By Oldneweng in forum METALWORK GENERALReplies: 14Last Post: 31st Jul 2015, 11:15 PM -
Cincinnati pedal power
By tongleh in forum METALWORK GENERALReplies: 13Last Post: 9th Nov 2012, 06:54 AM -
Poor man's DRO
By Big Shed in forum METALWORK GENERALReplies: 14Last Post: 7th Aug 2012, 05:01 PM -
Left Foot Accel Pedal Update
By Sterob in forum METALWORK GENERALReplies: 3Last Post: 9th Aug 2011, 03:39 PM -
Foot pedal question
By oo7fitzy in forum WELDINGReplies: 5Last Post: 25th Apr 2010, 10:46 PM