Digital Display - ESAB MEK 4 Service Manual

16

Digital display

The digital display unit is standard in the - - 881 and - - 883 variants of MEK 4. It is
available as an accessory for other wire feeder units: see the list on page 27.
The instrument can be connected either to the wire feeder unit or to the LAW power
unit. Connection requires a connection kit, which is supplied with the instrument
when it is ordered as an accessory. The kits differ for the MEK and the LAW units.
The instrument can be used only when the wire feeder unit is connected to an LAW
power unit.
The display board has two rows of 7- - segment displays, with three displays in each
row. The upper row displays arc voltage and the lower displays the welding current.
Data is transmitted serially to the display board from the LAW power unit, via inputs
A1, A4 and A5.
A smoothed 12 V DC power supply is supplied to the board via inputs A2 and A3
from the welding power unit. Voltage regulator VR1 produces a 5 V output.
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Component positions, display board AP02
- - 22 - -
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