Miller Electric CST 280 User Manual
Processes
Stick (SMAW)
TIG (GTAW) Lift-Arc
Input Power Requires 3- or 1-Phase Power
Amperage Range 5 – 280 A
Max. Open-Circuit Voltage 79 V
Weight 41 lb (18.6 kg)
Industrial Applications
Power Plant Construction
Petrochemical Construction
Maintenance and Repair
Shipbuilding
CST™280
Stick/TIG Welding
Power Source
Issued Feb. 2008 • Index No. DC/29.55
The Power of Blue®.
Miller Electric Mfg. Co.
An Illinois Tool Works Company
1635 West Spencer Street
Appleton, WI 54914 USA
Web Site
www.MillerWelds.com
International Headquarters
Phone: 920-735-4505
USA FAX: 920-735-4134
Canadian FAX: 920-735-4169
International FAX: 920-735-4125
Portable in the shop or at
the job site — at 41 lb the
CST 280 is easily moved
from location to location.
Superior Stick arc performance
even on the difficult-to-run
electrodes like E6010.
Adaptive Hot Start
™
for Stick
arc starts automatically
increases the output amperage
at the start of a weld should
the start require it. Prevents
the electrode from sticking
and creating an inclusion.
Remote amperage control
provided through 14-pin
receptacle on front of the
machine. This permits use
of standard remote
amperage control devices.
Tweco
®
or Dinse-style
connectors are available
on the CST 280.
6 ft power cable included.
Easy To Install with a new
switch on the outside of the
package, the machine can be
changed between low and high
input voltage ranges. Also,
since the switch is on the
back, input voltages can be
changed without removal
from inverter racks.
Optional 4- or 8-pack racks
are available for multiple
operator applications.
These are commonly used
in construction and shipyard
applications. All CST controls
including the power switch
are located on front of the
machine for easy access.
Power source is warranted for 3 years, parts and labor.
Original main power rectified parts are warranted for 5 years.
Quick
Specs
Lift-Arc™start provides TIG
arc starting without the use of
high frequency.
2
Welding
Mode
Stick
(SMAW)
TIG
(GTAW)
Rated Output
280 A at 31.2 V,
35% Duty Cycle
200 A at 28 V,
100% Duty Cycle
200 A at 28 V,
50% Duty Cycle*
150 A at 26 V,
100% Duty Cycle*
Welding
Amperage
Range
5–280 A
5–200 A
Input
Power
3-Phase
1-Phase
Max. OpenCircuit
Voltage
77 VDC
Net
Weight
41 lb
(18.6 kg)
Specifications (Subject to change without notice.)
Control Panel
Amps Input at Rated Load Output, 50/60 Hz,
208 V 220 V 230 V 400 V 440 V 460 V 575 V
— 35 34.2 — — 17.8 14.7
— 23.3 22.5 — — 11.7
9.7
— 43.9 43 — — — —
— 32.7 32 — — — —
Dimensions
H: 13-1/2 in
(343 mm)
W: 7-1/2 in
(191 mm)
D: 18 in
(457 mm)
*
Output ratings on 230 V single-phase are reduced to comply with CSA current limitation on input power cable.
MILLER ELECTRIC MFG. CO. APPLETON, WI
POWER PROCESS SELECT AMP ADJUST
OFF
ON
125
150
100
175
75
50
25
5
225
250
280
200
CST 280
S
T
I
C
K
E
X
X
1
8
S
T
I
C
K
E
X
X
1
0
S
O
F
T
S
T
I
F
F
S
O
F
T
S
T
I
F
F
L
I
F
T
-
A
R
C
™
T
I
G
1
2
3
4
5
1. Output Light
2. On/Off Switch
3. Weld Process Selector Switch
4. Overtemp Light
5. Amperage Adjustment Control (5–280 Amps)
Performance Data
300
250
200
150
100
50
0
10 20 30 40 50 60 70 80 90 100
100
90
80
70
XX18
Setpoint
150 Amps
XX18
Soft
XX18 Stiff,
XX10 Soft
XX10 Stiff
TIG
TIG
XX10
60
50
40
30
20
10
0
0 50 100 150 200 250 300
% DUTY CYCLE AMPERAGE
DUTY CYCLE CHART VOLT/AMP CURVE AT 150 AMPS
OUTPUT AMPERES
VOLTAGE
3-Phase Operation
1-Phase Operation
Description
CST-280,
220-230/460575 Dinse
CST-280,
220-230/460575 Tweco
KVA
14.6
9.6
10.1
7. 3
KW
10.2
6.4
6.6
4.6
Stick
(SMAW)
TIG
(GTAW)
280 A at 31.2 V,
35% Duty Cycle
200 A at 28 V,
100% Duty Cycle
200 A at 28 V,
50% Duty Cycle*
150 A at 26 V,
100% Duty Cycle*
5–280 A
5–200 A
3-Phase
1-Phase
67 VDC 41 lb
(18.6 kg)
36 33 22.8 19.8 18 17.5 —
23.5 23 22.8 13.5 12 12.7 —
43.9 43.3 43 — — — —
35 — 32.9 — — — —
H: 13-1/2 in
(343 mm)
W: 7-1/2 in
(191 mm)
D: 18 in
(457 mm)
CST-280,
208-230/400460 Dinse
CST-280,
208-230/400460 Tweco
14
10.2
9.9
7.6
10.2
6.9
6.5
4.8
CSA approval. 1P23M approval.
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