ESAB Origo Mag C171, Руководство по обслуживанию

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Edition 080529
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1sC1425
AP1:3,4,5 Start / Stop, Thermal overload, Spot welding
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Start / Stop circuit
When the torch trigger switch SB1 is not activated, the voltage between M3
and M4 is 24 V. Pressing the trigger switch shorts the circuit, producing a
voltage of 0 V between M3 and M4.
Thermal overload circuit
The machine contains thermal overload cutout, connected to inputs T8 and T9.
If it operates, the torch trigger switch circuit cannot be short--circuited, with the
result that wire feed cannot be started. When the thermal cutout has operated,
LED V7 is energised to indicate this via diode D7.
Spot welding circuit
Potentiometer R50 controls the spot welding time and incorporates a switch.
When in the zero position, the switch is open.
When the switch in R50 and torch trigger switch SB1 are closed, capacitor C22
charges up through resistors R32 and R50. Wire feed stops when the voltage
on C22 reaches 8.8 V. The trigger switch must be released and then pressed
again before a new spot weld can be made.
The spot welding time can be adjusted between 0.2 and 2.5 seconds
ᐔ
30%.