- Thread starter Ed2k
- Start date
Can't remember min amps but the wire speed knob will not decrease the wire speed. It's a SIP turbomig 195.
Just had my Clarke 170 nicked but the wire speed on that went down to a virtual stop. I do mostly car rebuilds so need something that will feed slowly. This SIP was bought by a friend and I can take it off his hands if there are parts available to mend it but having had a look inside it is obvious the control is part of a circuit board. Can't find spares on ebay or anywhere.
Just had my Clarke 170 nicked but the wire speed on that went down to a virtual stop. I do mostly car rebuilds so need something that will feed slowly. This SIP was bought by a friend and I can take it off his hands if there are parts available to mend it but having had a look inside it is obvious the control is part of a circuit board. Can't find spares on ebay or anywhere.
If the welder is a SIP Topmig Turbo 195T, then this is the circuit diagram:
www.sipuk.co.uk
The power source for the wirefeed motor is the main DC welding output. This is varied by the speed control section of the "MIG02 IPF" printed circuit board. There are some references to that board on the Forum, e.g.:
The potentiometer on the board - which may be 2k Ohm linear - does not control the motor directly ( i.e. it is not a current-varying rheostat ). It actually alters the motor speed by varying the length of voltage pulses fed to the motor by an electronic switch, based on a thyristor ( SCR ). That pot, or some other component, may be faulty. A photo of the board in the welder will help to confirm the board type.
As Hutcho asked, does the wirespeed knob actually have any control over the motor speed at all?
Since the power source is the welder voltage output, switching to a higher or lower output power setting on the 6-way switch should cause the motor speed to step up or down, independent of the speed control knob. Does this happen?
The original board may be repairable at component level, either by measurements and tests, or by speculative replacement of components.
There are companies that offer welder PCB repair services, e.g. Technical Arc in York.
Alternatively, the speed control part of the PCB could be replaced by a generic pulse-width-modulated ( PWM ) motor speed controller, e.g. eBay UK item 335572717602.
02595 Topmig 195T Circuit Diagram
SIP parts circuit diagram for the 02595 topmig 195t welder from SIP UK
www.sipuk.co.uk
The power source for the wirefeed motor is the main DC welding output. This is varied by the speed control section of the "MIG02 IPF" printed circuit board. There are some references to that board on the Forum, e.g.:
MIG 02 IPF - PCB - Wire motor supply mods.
Sorry first post and digging up very old ground. SIP TopMig Turbo 170 ~ 97/99 ish with MIG 02 IPF PCB ( No CN5 and off board relay setup). The wire supply control has gone, i still have variable resistance over the Pot so that is OK. I haven't tested anything else but will start on the TIP35C...
www.mig-welding.co.uk
The potentiometer on the board - which may be 2k Ohm linear - does not control the motor directly ( i.e. it is not a current-varying rheostat ). It actually alters the motor speed by varying the length of voltage pulses fed to the motor by an electronic switch, based on a thyristor ( SCR ). That pot, or some other component, may be faulty. A photo of the board in the welder will help to confirm the board type.
As Hutcho asked, does the wirespeed knob actually have any control over the motor speed at all?
Since the power source is the welder voltage output, switching to a higher or lower output power setting on the 6-way switch should cause the motor speed to step up or down, independent of the speed control knob. Does this happen?
The original board may be repairable at component level, either by measurements and tests, or by speculative replacement of components.
There are companies that offer welder PCB repair services, e.g. Technical Arc in York.
Alternatively, the speed control part of the PCB could be replaced by a generic pulse-width-modulated ( PWM ) motor speed controller, e.g. eBay UK item 335572717602.
