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Refer to figure 3 and:
1. Connect end of ground (GREEN) conductor to
a suitable ground. Use a grounding method
that complies with all applicable electrical
codes.
2. Connect ends of line 1 (BLACK) and line 2
(WHITE) and line 3 (RED) input conductors to
a de-energized line disconnect switch.
3. Use Table 1 and Table 2 as a guide to select
line fuses for the disconnect switch.
Input Voltage
208V
230V
460V
Table 3-1: Electrical Input Connections
NOTE
Fuse size is based on not more than 200 percent of
the rated input amperage of the welding power
source (Based on Article 630, National Electrical
Code).
Figure 3-1: Electrical Input Connections
5
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. At this point,
the Bus Voltages are checked and the welder is
enabled after the input capacitors have charged to
full operating voltage (after approximately 5 seconds).
NOTE
Note the available input power. Damage to the
welder could occur if 575VAC or higher is applied.
Fuse Size
100 Amps
90 Amps
30 Amps
3 – 2
300/400TS and 300/400S
The following 208-230/460V Primary Current rec-
ommendations are required to obtain the maximum
welding current and duty cycle from this welding
equipment:
Primary
Minimum
Supply
Primary
Model
Lead Size
Current
(Factory
Circuit Size
Fitted)
(Vin/Amps)
8/4 AWG
3φ
minimum
ARC
MASTER
300TS
300S
8/3 AWG
1φ
minimum
8/4 AWG
3φ
minimum
ARC
MASTER
400TS
400S
8/3 AWG
1φ
minimum
Table 3-2:
208-230/460V Primary Current Circuit sizes
to achieve maximum current
The ARC MASTER 300/400TS and 300/400S are
designed for use with a generator as an input
power source. Contact an accredited Thermal Arc
service agent for the proper sizing and set-up rec-
ommendations of a generator power source sys-
tem. As a general rule, depending on the type of
generator used, the generator capacity should be
twice the maximum rating of the welder.
3
INSTALLATION
Current & Duty
Cycle
TIG
STICK
−
208/31
300A
−
230/28
@ 40%
−
460/14
−
208/45
300A
−
230/41
@ 40%
−
460/21
−
208/51
250A
−
@ 40%
230/46
−
208/76
250A
−
@ 40%
230/68
−
208/49
400A
−
230/44
@ 25%
−
460/22
−
208/67
400A
−
230/61
@ 25%
−
460/31
−
208/67
300A
−
@ 25%
230/60
−
208/97
300A
−
@ 25%
230/87
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