Tp 1500 Vrd, Tp 1500 Tig Vrd; General Remarks; Safety Principle Of The Tp 1500 Vrd And Tp 1500 Tig Vrd; Warning Indicators When The Voltage Limitation Is No Longer Active - Fronius TransPocket 1500 Instructions De Service

TP 1500 VRD, TP 1500 TIG VRD

General remarks

VRD is an extra safety feature. VRD = voltage reduction device. Wherever possible, VRD
prevents output voltages which could be a hazard to life and limb.
Safety principle
of the TP 1500
VRD and TP 1500
TIG VRD
Fig.15 VRD is active
Fig.16 VRD is not active
Important! Within 0.3 seconds of the end of welding:
-
-
Warning indica-
tors when the
voltage limitation
is no longer
active
Fig.17 Flashing LEDs warn the user that: VRD is not active
VRD is active again
The output voltage is once again limited to 12 V
Warning! Welding voltage can be fatally dangerous. Depending upon which
process has been selected, LEDs (14) may flash. Flashing LEDs symbolise:
VRD is inactive. In this case, there is no limitation of the output voltage.
Welding-circuit resistance is larger than
the minimum human-body resistance
(greater than or equal to 200 ohms):
- VRD is active
- Open-circuit voltage is limited to 12 V
- Example: Accidentally touching both
welding sockets at the same time
(does not lead to any hazard)
Welding-circuit resistance is smaller than
the minimum human-body resistance
(smaller than 200 ohms):
- VRD is inactive
- No limitation of the output voltage, so
as to ensure sufficient welding power
- Example: Start of welding
2 2
(14)