LKB 220
VA METER ASSEMBLY INSTRUCTION
0349 302 079
(2001-02-13)
2
METER ASSEMBLY INSTRUCTION
1. Take off side panels of unit.
2. Fasten meter’s board with sleeve to front panel of unit.
3. Assemble cover of meter to partition of unit.
4. Disassemble inductor.
5. Disassemble rectifier bridge.
6. Disconnect current cable (+) from the bus.
7. Connect shunt and bus and next connect current cable (+) to free end of shunt.
8. Assemble rectifier bridge in unit.
9. Assemble inductor.
10. Connect wiring of meter according to schematic diagram of LKB 220.
LIST OF ELEMENTS
Pos. Element Description from diagram Number
1 VA-Meter circuit board A2 0349 302 119
2 Cover of board 0349 302 128
3 Shunt RI 0349 302 121
4 Wiring 0349 302 125
5 Sleeve 0349 302 113
6 Screw (2 pieces) WWSG M4x10KB
1. VA-Meter A2
2. Shunt
3. Bus
4. Wiring for circuit board A1
5. Wiring for transformer T2
6. Wiring for shunt and current socket cable (
)
7. Current cable (+)
8. Rectifier bridge
9. Inductor
10. Current socket cable (
)
3
RECALIBRATION PROCEDURE OF VA-MET12
NOTE: All diagrams and function descriptions below are valid for both VA-Met12 and VA-Met13
unless otherwise specified.
V/A-meter for measuring of welding voltage or current (readout is selected by switch S1 on the front of
meter) may be installed as optional accessory.
V/A-meter is supplied with 11VAC; input signal for current is delivered from standard 60mV shunt,
voltage is measured directly across welding rectifier output.
Depending on required current range (determined by applied shunt rating) – the jumpers X3&X4 on
the PCB must be properly arranged and the reference voltage U-REF must be adjusted by R4 – as
indicated in the diagram herewith (see the table).
Voltage indication is adjusted by potentiometer R1 on the PCB.
(Note: voltage adjusting is to be made only when jumpers and U-REF setting is completed!)
Recommended voltage-metering range is: 0V to –40V. (Calibration is performed for –25V).
Recommended current input range is: 0mV to +60mV. (Calibration for 60mV)
V/A meter has “HOLD” function – i.e. after stop of welding, there is memorised the last displayed value
(current or voltage – depending on S1 position).
There is also possibility to compensate the voltage drop on current wires – i.e. to get indication of the
actual welding arc voltage.
Compensation is adjusted by potentiometer R28 (on the bottom side of PCB); when utmost CCW
position – there is no compensation, turning CW increases the compensation step.
NOTE: Factory setting is “no compensation”, if necessary – use reference voltmeter and artificial load
– so as to adjust compensation depending on wire length.
4
NOTE: The above diagram is valid for any combination of LKC12/LKC13 and VA-Met12/VA-Met13.
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