Fronius AccuPocket 150/400 TIG, Operating Instructions Manual

Page: 54 / 88

VRD safety device (optional)
General VRD is an additional safety device that prevents, as far as possible, output
voltages that may pose a danger to persons.
VRD = Voltage Reduction Device.
Function
VRD is active
The welding circuit resistance is great-
er than the minimum human body res-
istance (greater than or equal to 200
Ohm):
- VRD is active
- Open circuit voltage is limited to
14 V
-
The VRD indicator lights up
- Example: no risk ensues if both
welding sockets are touched acci-
dentally at the same time.
VRD is not active
The welding circuit resistance is less
than the minimum human body resist-
ance (less than 200 Ohm):
- VRD is inactive
- Output voltage not limited in order
to ensure sufficient welding power
- The VRD indicator does not light
up
- Example: Start of welding
NOTE!
Within 0.
3 seconds of the end of welding:
▶
VRD is active again
▶
The output voltage is limited to 14 V again
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