Control card A002 functional testing
1 Current set value to power source (0,5…5 Vdc)
2 Current set value to power source (0,5…5 Vdc)
3GND
4GND
5GND
6GND
7
8 Output voltage from power source
(OCV on MMA 75 Vdc)
9
10
11
12
13 MMA/TIG-selection (TIG = 4,5 Vdc, MMA = 0 V)
14 26 Vac from power source
15 26 Vac from power source
16 16 Vdc from power source
The control card A002 uses the 24 Vac to control the solenoid valve and spark ignition, and
transforms the + 16 V voltage to + 5 V for control electronics.
Control card A002 alters the signal taken from control card A001´s (pin 1) set value circuit
according to the adjustments of the operating panel (pin2). It also controls the spark ignition and
solenoid valve.
The power source is controlled by the signal from flat cable´s pin 2 and changes in the operating
panel´s adjustments affect signal in pin 2. On TIG the pin 2 has voltage only when the start is
active and the machine is loaded.
Examples of the voltages on flatcable´s pins 1 and 2:
A=Pin 2 voltage
Pulse ratio approx. 50 %, pause current 40 % and cycle time 1,5 s (0,7 Hz)
B=Pin 1 voltage
Set value information from control card A001´s set value circuit
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