Tweco 400 MST Arc Master - Manual (Page 19)

400MST
2
INTRODUCTION AND DESCRIPTION
2 – 4
6
Specifications
Thermal Arc continuously strives to produce the
best product possible and therefore reserves the
right to change, improve or revise the specifica-
tions or design of this or any product without prior
notice. Such updates or changes do not entitle the
buyer of equipment previously sold or shipped to
the corresponding changes, updates, improve-
ments or replacement of such items.
7
Duty Cycle
The duty cycle of a welding power source is the
percentage of a ten (10) minute period that it can
be operated at a given output without causing over-
heating and damage to the unit. If the welding
amperes decrease, the duty cycle increases. If the
welding amperes are increased beyond the rated
output, the duty cycle will decrease.
WARNING
Exceeding the duty cycle ratings will cause the
thermal overload protection circuit to become ener-
gized and shut down the output until the unit has
cooled to normal operating temperature.
CAUTION
Continually exceeding the duty cycle ratings can
cause damage to the welding power source and
will void the manufactures warranty.
NOTE
Due to variations that can occur in manufactured
products, claimed performance, voltages, ratings,
all capacities, measurements, dimensions and
weights quoted are approximate only. Achievable
capacities and ratings in use and operation will
depend upon correct installation, use, applications,
maintenance and service.
Parameter 400MST
Rated Output
Amperes 400
Volts 36
Duty Cycle 25%
Duty Cycle
TIG
400A / 26V@25%
300A / 22V@60%
200A / 18V@100%
STICK
400A / 36V@25%
300A / 32V@60%
200A / 28V@100%
MIG
400A / 34V@25%
300A / 29V@60%
200A / 24V@100%
Output Current
Range TIG
5-400A
STICK
Output Voltage
Range
MIG 5-36V
Open Circuit Voltage 65V
Dimensions
Width 8.27" (210mm)
Height 16.89" (420mm)
Length 17.72" (450mm)
Weight 55.1 lb. 25.0 kg
Output@Rated Load Three-phase Single-phase
Rated Input Voltage 208-230/460V 208-230V
Output Amperes 400A 300A
Output Volts 36V 32V
Duty Cycle 25% 25%
KVA 24.0 20.0
KW 18.0 12.0
Output@No Load
KVA 0.5
KW 0.13
Input Volts Single
Phase Amperage Draw
@Rated Load
No Load
208V 97 2.4
230V 87 2.2
Input Volts Three
Phase
208V 67 1.4
230V 61 1.3
460V 31 0.7