Amada Miyachi Unitek STA-100A, Operation Manual, Page: 99 / 154

APPENDIX D: SYSTEM TIMING
STA SERIES AC CONTROLS
990-351 D-5
Spot Welding with 3 Impulses
DN1 DN2
FS1*
Current
Electrode
Valve
Solenoid
Valve
Electrode
Force
SQD SQZ UP1 W1 CO UP2 W2 HO OFF
*See Chapter 3 for description of Maintained, Pulsed, and Latched modes. One-stage footswitch shown.
**The first impulse is a W2 period only. The second and following impulses are a CO period followed by a W2 period.
First
Impulse**
Second
Impulse**
Third
Impulse**
CO W2 CO W2
Notes:
1
FS1 and FS2 are debounced for 30-70 ms upon opening and closing.
2
The microprocessor requires up to 70 ms of calculation time upon closure of FS1 and 50 ms of
calculation of FS2. Valves and current may have a different calculation time.