ESAB Heliarc 281iAC/DC, Operating Manual

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section 5 operation
controls & operation
1. switching on
1.1 The rear panel mounted rotary switch is the mains power ON/OFF switch.
Warning
the computer control sYstem memorizes the poWer source
control settings at poWer off. if the unit Was in mma moDe at
sWitch-off then When the unit is sWitcheD on, ocv Will Be pres-
ent at the WelDing output.
Setting the power switch to “ON” energizes the internal circuitry including the rear panel cooling fans and
auxiliary W.C.U. supply for the optional torch water cooler. All the various LED indicators on the control
panel will momentarily illuminate. The left and right hand LED readouts will flash for a short period indicating
the process/mode selected i.e. depending on the machine settings at the previous mains switch-off.
1.2 After 3 seconds approx., the display will change to ‘STANDBY MODE’. See Figure 5 indicating the process/
mode selected according to the LED illuminated in the SELECT MODE window. The L.H. (“V”) digital display
will read 000 except in SMAW mode when it will show the open circuit voltage (70V approx.). The R.H. dis-
play shows the preset main welding current “A” as adjustable by the Main Setting Control. In addition the
mains power indicator will be on and, if the unit is in SMAW mode, the welding output indicator LED will also
be on showing that welding output voltage is present.
Other LEDs may also be illuminated depending on the machine’s previous usage.
1.3 After changing the process/mode selection or any other parameters, slope down time, AC frequency etc.,
the display will always revert to the standby mode within 3-5 seconds of the change being completed.
1.4 While welding the L.H. and R.H. digital displays show the actual values of the welding voltage V and welding
current A. Note the welding voltage measurement is at the power source output terminals and may be
slightly higher than the actual arc voltage due to cable drops etc.
2. local/remote control operation
2.1 Connect the remote control unit, e.g. FC-5C foot control, to the 14 pin remote control receptacle.
2.2 Set the required maximum welding current, corresponding with the maximum position of the remote con-
trol, using the Main Setting Control while the unit is in standby mode.
operation