Miller Electric XMT 350 User Manual

XMT®350 Series

Multiprocess Welding

Power Source

Issued October 2007 • Index No. DC/18.83

Lightweight, aerospace-grade aluminum case

offers protection with the benefit of reduced weight.

Auto-Line

™

Power Management
Technology allows for any input voltage
hook-up (208 – 575 V) with no manual
linking required, providing convenience
in any job setting. Ideal solution for dirty
or unreliable input power.

Lift-Arc

™

allows TIG starting without the use of
high-frequency. Starts the arc without contaminating
the weld with tungsten.

Adaptive Hot Start

™

increases the output amperage
at the start of a weld if necessary, eliminating
electrode sticking.

Inverter arc control technology provides greater
puddle control for superior 6010 Stick electrode
performance, and outstanding MIG weld performance.

Fan-On-Demand

™

cooling system operates only
when needed, reducing noise, energy use and the
amount of contaminants pulled through machine.

The Power of Blue®.

Wind Tunnel Technology™protects electrical

components and PC boards from contamination.

Processes

MIG (GMAW)/Pulsed MIG (GMAW-P)*
Stick (SMAW)
TIG (GTAW)
Flux Cored (FCAW)
Air Carbon Arc Cutting and Gouging (CAC-A)

*XMT-350 MPa; XMT 350 CC/CV with
required optional control; not available with
XMT 350 VS model.

Input Power Requires 3- or 1-Phase Power,

208 – 575 VAC, 50/60 Hz

Rated Output 10– 38 V, 5–425 A
Weight Net: 80 lb (36.3 kg)

Ship: 89.1 lb (40.4 kg)

Heavy Industrial Applications

Construction

Shipbuilding

Railroad

Truck/Trailer Manufacturing

Fabrication

Repair Shops

Rental Fleets

Power Generation Plants

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: [phone]
USA FAX: [phone]
Canadian FAX: [phone]
International FAX: [phone]

Power source is warranted for 3 years, parts and labor.

Original main power rectified parts are warranted for 5 years.

Gun warranted for 90 days, parts and labor.

Quick
Specs

XMT 350 CC/CV

XMT 350 MPa with

Built-In Pulse MIG

(see page 4)

XMT 350 VS

Line voltage compensation keeps welding output

constant even if input power varies by +/-10%.
XMT 350 models further expand line voltage
compensation on 460 VAC to an amazing +37%, -59%.

Process selector switch reduces the number of
control setup combi nations without reducing
any features.

Large, dual digital meters are easy to view and are
presettable to ease setting weld output.

The XMT 350 Series is packed with
features to meet the most demanding
welding needs.

Please see page 2 to determine which
model is right for your application.

2

Certified to both the Canadian and U.S. Standards for welding equipment.

XMT®350 Performance Data

Input
Power

Three­Phase

Single­Phase

Rated Out put
at 60%
Duty Cycle

350 A at
34 VDC

300 A at
32 VDC

Amperage
Range in
CC Mode

5–425 A

5–425 A

Voltage
Range in
CV Mode

10–38 V

10–38 V

Max. Open­Circuit
Voltage

75 VDC

75 VDC

Amps Input at Rated Load Output, 60 Hz,
208 V 230 V 400 V 460 V 575 V KVA KW

40.4 36.1 20.6 17.8 14.1 14.2 13.6

60.8 54.6 29.7 24.5 19.9 11.7 11.2

Weight

80 lb
(36.3 kg)

Dimensions

H: 17 in (432 mm)
W: 12-1/2 in (318 mm)
D: 24 in (610 mm)

Amperage
Class*

300 A
350 A

565 A

Power
Processing

Auto-Link

®

Auto-Line

™

Manual

Remote
Capability

Yes
Yes
Yes
No
Yes

Industrial Inverters

XMT 304 CC/CV, 230/460 VAC
XMT 350 MPa, 208 – 575 VAC
XMT 350 CC/CV, 208 – 575 VAC
XMT 350 VS, 208 – 575 VAC
XMT 456 CC/CV, 230/460 VAC

Process
Capability

Stick,
DC TIG,
MIG,
CAC-A

Pulsed MIG Capability

Optima™Pulse Control Required
Built-In
Optima™Pulse Control Required
No
Optima

™

Pulse Control Required

Connectors

Dinse only
Dinse or Tweco
Dinse or Tweco
Tweco only
Ring Lug only

For more
Information

Lit. No. DC/18.8
Page 4
Page 3
Page 3
Lit. No. DC/18.8

Auxiliary
Power

Optional
Optional
Optional
No
Standard

XMT®350 Specifications

(Subject to change without notice.)

Which XMT®is Right for You?

Additional Features

Exceptional electrical efficiency. At 400 A,
efficiency is 87.24%!

350 A of welding output at 60% duty cycle
with superior low-end performance.

Power factor of .95 enables smaller

fuses/breakers and primary wiring. Primary
amperage draw at rated output is 25% less
than the competition.

Ultra-tough, polycarbonate-blended cover
for control panel protects front controls

from damage.

Optional gas solenoid for TIG welding.

*60% Duty Cycle Rating

Which XMT 350
is right for you?

Need Pulsed MIG

NO

(GMAW-P)

capability?

YES

See XMT 350 MPa

(page 4)

Most often Stick (SMAW)

or Flux Cored (FCAW) welding

with a voltage-sensing

feeder?

YES

See XMT 350 VS

(page 3)

NO

See XMT 350 CC/CV

(page 3)

500
425

400

3-PHASE OPERATION

350

300

1-PHASE OPERATION

250

200

WELDING AMPERES

150

100

10 15 20 25

DUTY CYCLE CHART

6 AWG POWER CORD

8 AWG POWER CORD

30

DUTY CYCLE

100

90

80

70

60

50

VOLTAGE

40

30

20

10

0

10040 50 60 70 9080

CC VOLT/AMP CURVE

SMAW
MAX

SMAW

GTAW

80A

MIN

0 100 200 300 400 500

ARC

0%

CONTROL

25%

50%

75%

100%

AMPS

CV VOLT/AMP CURVE

MAX

MIN

0 100 200 300 400 500

AMPS

GTAW
MAX

100

90

80

70

60

50

VOLTAGE

40

30

20

10

0

3

1. Voltmeter

2. Process Selector Switch (Rotary Switch)

3. Ammeter

4. Voltage/Amperage Adjustment Control

5. Arc Control
NOTE:

VS model is equipped with Tweco-style output connector.

1. Voltmeter

2. Remote Control Receptacle

3. Process Selector Switch (Rotary Switch)

4. Ammeter

5. Voltage/Amperage Adjustment Control

6. Arc Control

XMT®350 VS Control Panel

XMT®350 CC/CV Control Panel

Additional Features

Low OCV Stick — A built-in, selectable
feature, that reduces the Stick mode
open-circuit voltage (OCV) to nearly
15 volts when the welding power source is
not in use. Eliminates the need for add-on
voltage reducers.

Note: VS model is available only with
Tweco-style weld cable disconnects. Tweco
cable connectors are not supplied with the
unit and must be ordered separately.

Optional 115 VAC auxiliary power is not
available on VS model.

Pulsed MIG (GMAW-P) capability is not
available on VS model.

Additional Features

Auto Remote Sense™enables unit to

automatically use remote control if
connected to remote control receptacle.

Low OCV Stick — A built-in, selectable
feature, that reduces the Stick mode
open-circuit voltage (OCV) to nearly
15 volts when the welding power source is
not in use. Eliminates the need for add-on
voltage reducers.

Dinse International-style weld disconnects

provide high-quality weld cable connections.
Dinse and Tweco connectors are available.
When Dinse connectors are specified, two
connectors are supplied with the unit.

Optional 115 VAC auxiliary power provides
10 amps of circuit-breaker-protected power
for water circulators, etc.

Pulsed MIG (GMAW-P) capabilities with
optional Optima

™

control reduces spatter
and distortion, allows better out-of-position
puddle control, and provides potential
reduction of fume particle emission.

Manufactured Under the
Following US Patents:
5,601,741 5,642,260 5,902,150
6,002,103 6,115,273 6,193,548
6,239,407 6,266,257 6,625,046
6,611,189 6,426,888
Other Patents Pending

1

2

3

4

5

Manufactured Under the
Following US Patents:
5,601,741 5,642,260 5,902,150
6,002,103 6,115,273 6,193,548
6,239,407 6,266,257 6,625,046
6,611,189 6,426,888
Other Patents Pending

1

2

3

4

5

CC

6