Voltage Reduction Device (Vrd Versions Only); General; Safety Principle - Fronius TransPocket 2500 Operating Instructions Manual

Voltage Reduction Device (VRD versions only)

General

A Voltage Reduction Device (VRD) is an optional safety device for reducing the
voltage. As far as possible, VRD prevents output voltages at the current sockets
that may pose a danger to persons.

Safety principle

VRD is active
VRD is not active
IMPORTANT!
Within 0.3 seconds of the end of welding
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VRD is active again
The output voltage is limited to 12 V again
Welding circuit resistance is greater
than the minimum human body resist-
ance (greater than or equal to 200
Ohm):
- VRD is active
- Open circuit voltage is limited to
12 V (otherwise 90 V)
- There is no risk in unintentionally
touching both welding sockets at
the same time
Welding circuit resistance is less than
the minimum human body resistance
(less than 200 Ohm):
- VRD is inactive
- Output voltage not restricted in
order to ensure sufficient welding
power
- Example: Start of welding