Input Power; High Frequency Introduction - Thermal Arc ARCMASTER 300 AC/DC Operating Manual

3.05 Input Power

Each unit incorporates an INRUSH circuit and input voltage sensing circuit. When the MAIN CIRCUIT SWITCH is
turned on, the inrush circuit provides a pre-charging of the input capacitors. SCR's in the Power Control Assembly
(PCA) will turn on after the input capacitors have charged to full operating voltage (after approximately 5 seconds).
Note the available input power. Damage to the PCA could occur if 460VAC or higher is applied.
The following 208/230V Primary Current recommendations are required to obtain the maximum welding current and
duty cycle from this welding equipment:
Model
ArcMaster
300ACDC
Table 3-2 208/230V Primary Current Circuit sizes to achieve maximum current

3.06 High Frequency Introduction

The importance of correct installation of high frequency
welding equipment cannot be over-emphasized.
Interference due to high frequency initiated or stabilized
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.
Februrary 22, 2006
NOTE
Primary Supply Minimum Primary
Lead Size Current Circuit Size
(Factory Fitted) (Vin/Amps)
230/29
12/3 AWG 208/32
minimum
230/38
208/40
ARCMASTER 300 ACDC
Current & Duty Cycle
TIG STICK
185 @ 30%
-
160 @ 40%
-
WARNING: COMPUTERS
It is also possible that operation close to
computer installations may cause computer
malfunction.
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