ESAB Origo Arc 410c, Руководство по обслуживанию

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13
Remote wireless welding current setting receiver circuit
Circuits D1 and D2 form an 8-bit meter recording the set value of welding current in binary numbers.
A3 and A4 integrated circuits form the C/A converter which transforms the binary value of the current
into the setting voltage of the value within the range of 0 – REF1.
The A5a comparator shapes the impulses of the signal sent by the N02 transmitter. The received
signal is processed in the circuit of impulses selector and separator. As a result of such process, the
following impulses are sent: RESET impulse and COUNT impulse, with the duration proportional to the
set welding current. The D3a gate generates the impulse which resets D4 and D5 meters.
The flip-flop consisting of D3b and D3c controls the process of counting impulses while the information
concerning the set welding current is sent by the transmitter. The A5b comparator blocks the receiver
during welding. R24 potentiometer is used for calibrating the setting voltage range. Calibration of the
setting voltage for the receiving part of the remote wireless welding current setting is described in the
procedure of the A12 panel checking and calibrating and included at the and of the manual.
A12 panel supply
Power unit made on the TS1 transformer is used for supplying the panel. The TS1 transformer is
connected to alternating voltage of 42V. The power unit pr15V and –15V voltage for supplying
integrated circuits of the wireless current setting receiver as well as +5V and –5V voltage for supplying
the meter.
Elements V
1
, C
21
, R
16
and V
2
make up the +15V voltage power unit, while elements V
3
, C
29
, R
17
, V
4
and C
30
make up the –15V negative voltage power unit.
Elements C
20
, VB1, C
23
, A6, C
24
, C
26
make up the +5V voltage power unit, while on elements R
1
, V
5
,
C
31
the –5V negative voltage power unit is made.