mig 275r & mig 350r service manual - boc · pdf file4 boc smoothcut advance mig 275r & mig...

MIG 275R & MIG 350R Service manual

Ver.1 Rev.1 . 0314
Important Notice
This document has been prepared by BOC Limited ABN 95 000 029 729 (BOC), as general information and does not contain and is not to be taken as containing any specific recommendation. The document has been prepared in good faith and is professional opinion only. Information in this document has been derived from third parties, and though BOC believes it to be reliable as at the time of printing, BOC makes no representation or warranty as to the accuracy, reliability or completeness of information in this document and does not assume any responsibility for updating any information or correcting any error or omission which may become apparent after the document has been issued. Neither BOC
nor any of its agents has independently verified the accuracy of the information contained in this document. The information in this document is commercial in confidence and is not to be reproduced. The recipient acknowledges and agrees that it must make its own independent investigation and should consider seeking appropriate professional recommendation in reviewing and evaluating the information. This document does not take into account the particular circumstances of the recipient and the recipient should not rely on this document in making any decisions, including but not limited to business, safety or other operations decisions. Except insofar as liability under any statute
cannot be excluded, BOC and its affiliates, directors, employees, contractors and consultants do not accept any liability (whether arising in contract, tort or otherwise) for any error or omission in this document or for any resulting loss or damage (whether direct, indirect, consequential or otherwise) suffered by the recipient of this document or any other person relying on the information contained herein. The recipient agrees that it shall not seek to sue or hold BOC or their respective agents liable in any such respect for the provision of this document or any other information.
Warranty Information
Terms of Warranty
The Smootharc ADVANCE machine has a limited warranty that covers manufacturing and material defects only. The warranty is affected on the day of purchase and does not cover any freight, packaging and insurance costs. Verbal promises that do not comply with terms of warranty are not binding on warrantor.
Limitations on Warranty
The following conditions are not covered under terms of warranty: loss or damage due to or resulting from natural wear and tear, noncompliance with operating and maintenance instructions, connection to incorrect or faulty voltage supply (including voltage surges outside equipment specs), incorrect gas pressure overloading, transport or storage damage or fire or damage due to natural causes (e.g. lightning or flood). This warranty does not cover direct or indirect expenses, loss, damage of costs including, but not limited to, daily allowances or accommodation and travelling costs.
NOTE Under the terms of warranty, welding torches and their consumables, feed, drive rollers and feeder guide tubes are not covered. Direct or indirect damage due to a defective product is not covered under the warranty. The warranty is void if changes are made to the product without approval of the manufacturer, or if repairs are carried out using nonapproved spare parts. The warranty is void if a nonauthorised agent carries out repairs.
Warranty Period
The warranty is valid for 3 years from date of purchase provided the machine is used within the published specification limits.
Warranty Repairs
Your service provider must be informed within the warranty period of any warranty defect. The customer must provide proof of purchase and serial number of the equipment when making a warranty claim. Warranty repairs may only be carried out by approved BOC service providers. Please contact your local BOC Gas & Gear for a directory of BOC approved service providers in your area.
Recommended Safety Precautions
Electrical Shock
Nevertouchliveelectricalparts.
Alwaysrepairorreplacewornordamagedparts.
Disconnectpowersourcebeforeperformingany maintenance or service.
Earthallworkmaterials.
Neverworkinmoistordampareas.
Avoid electric shock by:
Wearingdryinsulatedboots.
Wearingdryleathergloves.
Workingonadryinsulatedfloorwherepossible.
2 BOC Smoothcut Advance MIG 275R & MIG 350R Service manual

Ver.1 Rev.1 . 0314
Contents.
1.0 Fundamental schematic and circuit diagrams 41.1 Wiring diagram for Advance MIG 275R 41.2 Wiring diagram for Advance MIG 350R 51.3 Advance MIG 275R/350R boards 6
2.0 Troubleshooting and maintenance 14
3.0 Exploded view and component parts list 163.1 Exploded view of Advance MIG 275R 163.2 Component parts list for Advance MIG 275R 173.3 Exploded view of Advance MIG 350R 193.4 Component parts list for Advance MIG 350R 20
3BOC Smoothcut Advance MIG 275R & MIG 350R Service manual

Ver.1 Rev.1 . 03144 BOC Smoothcut Advance MIG 275R & MIG 350R Service manual
1.1 Wiring diagram for Advance MIG 275R
1.0 Fundamental schematic and circuit diagrams

Ver.1 Rev.1 . 0314 5BOC Smoothcut Advance MIG 275R & MIG 350R Service manual
1.2 Wiring diagram for Advance MIG 350R

Ver.1 Rev.1 . 0314
Ser. No. Pin Description
J3 1 15V2 GND3 voltmeter
4 Ampere meter5 GND6 Arc characteristic7 GND8 Volt Set signal
J2 1 GND 2 Set wire feed speed3 Once pin 4 is at high potential, fast wire speed;
once at low potential, low wire speed4 12V5 Once pin 5 is at high potential check gas;
once at low potential, do not check gas6 12V7 NC8 NC9 Once pin 2 is at high potential, 2T; once at low
potential, 4T10 12V
1.3 Advance MIG 275R & MIG 350R boards
1.3.1 Control panel schematic

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1.3.2 Bottom board schematic
1.3.3 Bottom board circuit diagram
CON3 AC240VCON4 AC240V connect solenoid valveCON6 1 GND
3 24VCON7 1 GND
2 +DC340VK1 Solenoid valve relay if the solenoid valve is not pulling in: if 24V relay pulls in solenoid valve
damaged; if 24V relay does not pull in Q1 Z24 circuit damage check it.K2 Slow starting relayRX1 Fielddischarge resistance: if startup frequency is high, fielddischarge resistance will break
off cool down for a while and restart.

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1.3.4 Fan board schematic
Caption neededCaption needed
Ser. No. Description
CON1 Fan, C5 fan startup capacitorCON2 AC220V input
Notice: MIG350R has common principle

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CON1 DC auxiliary currentMIG275R DC auxiliary current is 310Vwhile MIG350R is 540Vif the above DC auxiliary current needs to be repairedparticular attention must be paid to the positive and negative pole
CON2 1 24V2 GND
CON3 1 5V2 Arc characteristic signal 3 GND4 NC
CON4 1 Current detection signal, if pin 1 is at low potential, no output current; if high potential, no output
2 GNDCON5 Mutual inductor, current sampled signalCON6 1 5V
2 Volt Set signal3 Lowest Volt Set signal4 GND
CON7 CON7 pin 2 voltmeter sampled signalCON8 1 5V
2 Ampere sampled signal 3 GND
Ser. No. Pin Description CON9 1 Current feedback signal
23 GND4 Voltage feedback signal
CON10 1 24V2 Guard lamp3 24V4 Power light NC
CON11 1 15V2 GND
CON12 Current detection signalCON13 Drive signalCON14 1 GND
2 24V3 24V4 GND5 GND6 GND pin 5 and pin 6 short circuit7 24V seal signal
CON15 NC
10
1.3.5 Control board schematic

Ver.1 Rev.1 . 031410 BOC Smoothcut Advance MIG 275R & MIG 350R Service manual
1.3.6 Control board circuit diagram

Ver.1 Rev.1 . 0314
Ser. No. Description
1 GND2 GND3 Seal signal pin. Seals if low potential, lower 3525 pin 8. 4 GND5 NC6 15V7 Overheating protection signal: if low potential, overheating protection
is activated.8 NC9 Over current protection: Pin 9 is a mutual inductor current sampled signal. If
the potential is higher than the set value, it will close 10 GND11 24V12 Set signal13 GND14 Drive signal15 15V16 Drive signal17 24V18 Drive signal19 NC20 Drive signal21 NC22 GND
1.3.7 Control module schematic

Ver.1 Rev.1 . 0314
CON1 1 GND2 24V3 24V4 GND5 GND6 GND pin 5 and pin 6 short circuit7 24V seal signal
CON2 Wire feederCON3 1 NC
2 12V3 Check gas. If pin 3 potential is higher, Q6 break
over, solenoid valve pull in, gas feeds.CON4 1 Current detection signal. If output end current
exists, feeds wire in normally, if no load, no current, pin 1 has low potential, TL494 pin 2 potential will be lowered, wire feed speed becomes slow.
2 GND3 NC
Ser. No. Pin Description CON5 If solenoid valve, gascheck and hand switch is
on, solenoid valve should pull in thus allowing gas feed.
CON6 Fan switch signalCON7 1 12V
3 2T/4T. If pin 3 potential is high 2T, If low potential, 4T.
CON8 NC (wire diameter option)CON9 2 Wire feed speed set signal, other pins NCCON10 1 12V
2 If pin 2 is at high potential, Q8 breaks over, closes, stable volt D20 reverse break down. TL494 pin 2 high

mig 275r & mig 350r service manual - boc · pdf file4 boc smoothcut advance mig 275r & mig...

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