Amada Miyachi Unitek STA-100A, Operation Manual, Page: 80 / 154

APPENDIX A: TECHNICAL SPECIFICATIONS
STA SERIES AC CONTROLS
A-2 990-351
ITEMS SPECIFICATIONS
Regulation
Percent Heat Mode
Control Speed
Accuracy
Constant Current – Primary
Monitor
Control Algorithm
*Initial Responding
Speed
*Voltage regulation
*Resistive load
regulation
*Inductive load
regulation
Constant Current –
Secondary
Monitor
Control Algorithm
*Initial Responding
Speed
*Voltage regulation
*Resistive load
regulation
*Inductive load
regulation
*Average Current
Accuracy
*For welds between 20%
and 95% of full current
Responds by end of second cycle to input voltage fluctuations.

3% of set point for fluctuation of

10% of power source voltage
Internal current transformer
Whole cycle (symmetrical) by cycle
Set point current

10% after 4 cycles

2% of set point for +10, –15% AC voltage fluctuation

2% of set point for

15% load resistance fluctuation

2% of set point for

15% load induction fluctuation
External Rowgowski Coil (Torroidal Coil)
Half cycle by half cycle
Set point current

10% after 2 cycles

2% of set point for +10, –15% AC voltage fluctuation

2% of set point for

15% load resistance fluctuation

2% of set point for

15% load induction fluctuation

1% of set point of full scale after initial response