Welding dropouts / missing spots

Welding dropouts / missing spots

Possible cause /checklist:

• Check all terminals at the Pacemaker board.
  • wait for 5 minutes after switching off the unit
     
• Check welding sensor (position/exchange).
   
• Check the piece counter in the display. If more can bodies are counted, than there are physically – there is a problem with the welding sensor.
   
• Check the welding pressure:
        Is S31 always „ON“ (LED green) / Display > 30.0 daN!
   
• If the welding pressure is secured, you can bypass the signal with a trial jumper, see diagram page 2:
  • a) remove and insulate terminal 5 of the PM.
     
  • b) jumper terminal 1 > 5
          Do this only for the trial, need to be reversed afterwards!
     
• Are the time settings t1 and t2 correct?
   
• Is the weld power limiter switched „ON“? Which mode is chosen? Glueing?
   
• If you can weld a can body with only main current and the error occurs quiet often, you can try the following:
   
  • a) remove the welding sensor.
     
  • b) start production and cover the sensor by hand, as soon as can bodies are welded.
          Important: Switch “OFF” the sensor before you open the welding pressure!
     
• Check if the wire has no dent’s (mechanical damage for example due to too big can gap).