Tweco 130i Transarc Service Manual - Manual (Page 25)

TRANSARC 130i
Manual 0-5282 4-1 INSTALLATION, OPERATION AND SETUP
SECTION 4:
INSTALLATION, OPERATION AND SETUP
4.01 Transarc 130i Power Source Controls, Indicators and Features
A-11733
A-11743
Figure 4-1: Front Panel Figure 4-2: Rear Panel
1. VRD ON/OFF Indicator Lights
A VRD (voltage reduction device) is a hazard reducing device designed to reduce electric shock hazards
present on the output of welding power source when operating in MMAW (stick) mode. Note that the
presence of VRD should not be used as a substitute for the use of appropriate safety practices as indicated
in section one of this manual.
Both the green and red indicator lights only operate in MMAW (stick) mode.
The green VRD ON light illuminates (red light is off) when the VRD is active. Under this condition the open
circuit voltage of the unit is limited to below 10V DC, thus reducing the potential of serious electric shock
(such as when changing electrodes).
The red VRD OFF light illuminates (green light is off) when the VRD is inactive. Under this condition the
output voltage of the unit will be at welding potential which in some cases may exceed 25V DC.