Amada Miyachi Unitek STA-100A, Operation Manual, Page: 107 / 154

STA SERIES AC CONTROLS
990-351 G-1
APPENDIX G
VOLTAGE MONITOR BOARD OPTION
Description
The Voltage Board gives the Control the ability
to compare weld voltage against pre-
programmed high and low limits. This board
allows you to monitor either peak or average
(RMS) voltage.
You can also select when the voltage is
monitored, either during both weld periods
(excluding up/downslope) or during the last
cycle only. When doing a constant current weld,
the last cycle voltage monitoring is useful for
calculating the specific resistance of the part at
the end of the weld.
Voltage Monitor Board
Specifications
Voltage Measurement Range: .10 to 9.99 volts
Accuracy: +/- 2% of full scale
Operation
Voltage Monitor functions are described in Chapter 3,Using STA Series Control Functions.
Maintenance/Replacement
1 Disconnect the serial cable connector (26-pin ribbon cable) connected to J10 on the Voltage
Board.
2 Disconnect the voltage sensing cables from V1 through V4 on the Voltage Board as required.
3 Slide the card out of the card cage.
4 Reconnect the voltage sensing cables to V1 through V4 on the Voltage Board as required.
5 Reconnect the serial cable connector (26-pin ribbon cable) to J10 on the Voltage Board.
6 Install or re-install the circuit board by sliding it into the card cage.