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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 greater
than the minimum human body resistance
(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 wel-
ding sockets are touched accidentally
at the same time.
VRD is not active
The welding circuit resistance is less than
the minimum human body resistance (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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