Lincoln Electric IM542-D Touch Sense Command ARC Detect, GAS Fault, Water Fault, Voltage Feedback

C-4 C-4

ROBOTIC INTERFACE

ting and clearing the miscellaneous output #4.

		4.12 TOUCH SENSE COMMAND
4.4	ARC DETECT	The touch sense command is generated by active low
The arc detect signal is generated from the voltage and		welding output 3 (WDO3). The signal is then inverted
current signals on the control board. The arc detect cir-		and isolated from the robot ground with an output
cuit is calibrated to detect a minimum arc of 15V and		made to conduct 24VAC. The 24VAC connection is the
30A. The signal is isolated from the control ground and		wire feeder 2 trigger.
tied to the robot controller welding input 2 (WDI2).		4.13 WIRE+ & WIRE-
4.5	GAS FAULT	These two signals work together to cold inch the wire
This signal is not connected to anything on the inter-		at ±80IPM. The forward wire inch command is gener-
face board. The signal (WDI3) is simply re-routed from		ated by active low welding output 4 (WDO4).	The
the robot connector (P82) to the miscellaneous con-		reverse wire inch command is generated by active low
nector (P84). A gas fault is generated when this signal		welding output 5 (WDO5). When either of the two sig-
is tied to the robot ground.		nals is received an isolated inch command is generat-
		ed and tied to the interface wire inching input. At the
4.6	WATER FAULT	same time the motor drive relays switch to the correct
The water fault signal is generated by an active high		direction. The default direction for the motor	drive
(w/low water pressure reading) signal on the display		relays is forward, if both the signals are low at the same
board. The signal is then isolated from the display		time then the motor drive relays are set for reverse. No
ground, inverted, and tied to the robot controller weld-		damage will be caused by driving both signals low at
ing input 5 (WDI5).		the same time.
4.7	POWER FAULT	4.14 DUAL PROCEDURE SWITCH COMMAND
The power fault signal is generated by checking the		The dual procedure switch command is generated by
12.8V supply on the interface board. If the supply volt-		active low welding output 7 (WDO7). The signal is then
age on the interface board drops below ≈11.2V then a		isolated from the robot ground and tied to the interface
power fault signal is generated. The signal is then iso-		dual procedure input.
lated from the control ground and tied to the robot con-
troller welding input 6 (WDI6).		4.15 WIRE STICK DETECT
		The wire stick detect signal is generated by a voltage
4.8	VOLTAGE FEEDBACK	check across the output studs. The robot controller
The arc voltage feedback signal is generated on the		samples this signal a predetermined time after the Arc
control board. The interface board then filters, multi-		Enable signal changes from enabled to disabled. The
plies by 2, and isolates the signal from the control		signal is then isolated from the control ground and tied
ground. The signal is then tied to the robot controller		to the robot controller wire stick detect inputs (WDI+ &
analog input 1 (ADCH1). A voltage feedback signal of		WDI-).
7.62V is equal to an arc voltage of 80V.
4.9	CURRENT FEEDBACK

The arc current feedback signal is generated on the control board. The interface board then filters, multi- plies by 4, and isolates the signal from the control ground. The signal is then tied to the robot controller analog input 2 (ADCH2). A current feedback signal of 8.32V is equal to an arc current of 750A.

4.10 WELD START

The weld start command is generated by active low welding output 1 (WDO1). The signal is then isolated from the robot ground, inverted, and tied to the inter- face trigger input.

4.11 GAS START

The gas start command is generated by active low welding output 2 (WDO2). The signal is then isolated from the robot ground and tied to the gas solenoid dri- ver.

POWER WAVE 450