Fronius AccuPocket 150/400 Operating Instructions Manual page 25

(7) On/Off button
for switching the power source on and off.
The button must be pressed for at least 2 seconds before it responds (to protect
against accidental operation)
(8) Adjusting dial
- for continuous adjustment of the selected setting value (4)
(9) TAC indicator
lights up when the tacking function is activated
(only on TIG devices during the TIG welding process)
(10) Setting value button
for selecting the desired setting value (1)
(11) Status indicators
display various operating modes of the power source:
- VRD - lights up if the VRD safety device (optional) is present and the re-
duced safety voltage is present at the welding sockets
- Setup - lights up in Setup mode
- Temperature - device outside the permitted temperature range
- Error - also see chapter "Troubleshooting" on page 38
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