APPENDIX C: SYSTEM TIMING
IS-300CA INVERTER POWER SUPPLY
990-418 C-5
Two-Stage Start
When the 1ST STAGE is input, the solenoid valve output (SOL1 or SOL2) is turned ON and goes in to
the standby state of the 2ND STAGE input. When the 2ND STAGE is input, welding sequence starts.
TW SQD SQZA HOWELD
SOL1/SOL2
2ND STAGE
1ST STAGE
elding current
TW: 2ND STAGE input standby state.
A: DELAY START SET setting + Welding preparation time.
When the 2ND STAGE is input before the 1ST STAGE input, welding sequence starts. When welding
sequence starts, 1ST STAGE signal is not received until welding sequence ends.
SQD SQZA HOWELD
SOL1/SOL2
2ND STAGE
1ST STAGE
elding current
A: DELAY START SET setting + Welding preparation time.
Two-Stage Start
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