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VOLTAGE
VOLTAGE
PANEL
VOLTAGE CONTROL
AMPERAGE
ARC CONTROLPOWER
OFF
REMOTE 10
REMOTE 14
REMOTE 14
CBI
REMOTE
ON
S
T
L
M
I
G
S
S
M
I
G
A
L
M
I
G
1
2
3
4
5
6
7
8
9
WELDING AMPS
% DUTY CYCLE
DUTY CYCLE CHART
500
450
400
350
300
250
200
150
50
10 20
30
908070605040
100
100
Performance Data
2
Control Panel
Arc Control
Shopmate
™
300 Specifications (Subject to change without notice.)
Rated Output
250 A at 30 VDC,
60% Duty Cycle
Amperage
Range
5–400 A
Voltage
Range
10–35 V
Max. Open-
Circuit Voltage
80 VDC
Dimensions
H: 24-1/2 in (622 mm)
including lift eye
W: 19 in (483 mm)
D: 25-1/2 in (648 mm)
Net
Weight
177 lb
(80.3 kg)
Example: Preset for MIG welding with steel wire
Control adjusts inductance for MIG welding. Set Arc
Control to desired wire type. Inductance determines the
“wetness” of the weld puddle. As setting is increased
(rotating Arc Control clockwise), wetness (puddle fluidity)
increases. For best results, preset Arc Control to the wire
type. Then either increase or decrease setting within wire
type scale to make fine adjustment to the welding arc.
1. Ammeter
2. Voltmeter
3. Power Switch
4. Arc Control
5. Voltage Adjustment Control
6. Remote 10 Receptacle
7. Supplementary Protector CBI
8. Remote 14 Receptacle
9. Voltage Control Switch
S
T
L
M
I
G
S
S
M
I
G
A
L
M
I
G
Arc Control
(Counter Clockwise)
Low Inductance
Weld Bead
Arc Control
(Clockwise)
High Inductance
Weld Bead
Amps Input at Rated Output, 60 Hz
208 V 230 V 460 V 575 V KVA KW
66 57 29 23 13 11.2
Certified to both the Canadian and U.S. Standards for welding equipment.
Note: For input conductor and fuse size information consult the Owner’s Manual.