Tweco ArcMaster 401MST - Manual (Page 33)

ARCMASTER 401MST POWER SOURCE
Manual 0-5287 3-3 INSTALLATION, OPERATION AND SETUP
Welding Power Source
Ground Terminal
Ground Conductor
Line Disconnect Switch
Line Fuse
Primary Power Cable
Art # A-12451
Figure 3-1 Electrical Input Connections
Input Power
Each unit incorporates an INRUSH circuit and input voltage sensing circuit. When the MAIN SWITCH is turned
ON, the inrush circuit provides a pre-charging of the input capacitors. A relay in the Main Power PCB2 will turn on
after the input capacitors have charged to operating voltage (after approximately 5 seconds).
NOTE
Note the available input power. Damage to the PCB could occur if 575VAC or higher is applied.
3.05 High Frequency Introduction
The importance of correct installation of high frequency welding equipment cannot be overemphasized. Interference
due to high frequency initiated or stabilised arc is almost invariably traced to improper installation. The following
information is intended as a guide for personnel installing high frequency welding machines.
!
WARNING EXPLOSIVES
The high frequency section of this machine has an output similar to a radio transmitter. The machine
should NOT be used in the vicinity of blasting operations due to the danger of premature firing
!
WARNING COMPUTER
It is also possible that operation close to computer installations may cause computer malfunction.