Univex HF-251 User Manual

High-Frequency Arc

Starter and Stabilizer

Issued August 2007 • Index No. AY/5.0

Processes

Gas Tungsten Arc
Welding (TIG)

Input Power 1-Phase Power

Rated Output 250 A, 60% Duty Cycle

Weight HF-251D-1: 34 lb (15 kg)

HF-251-2: 36 lb (16 kg)

Industrial/Light Industrial Applications

General Manufacturing
Tool and Die
Repair Shops
All-Purpose Maintenance

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]

Quick
Specs

The Power of Blue®.

Gas solenoid valve.

Two versions (115 VAC, 50/60/100 Hz
and 230 VAC, 50/60 Hz) meet most

single-phase power configurations, and
all are rated at 60% duty cycle.

The HF-251 is compatible with power
sources made by other manufacturers.

For use with power sources with 14-socket
receptacle (5-socket adapter available).

Power on/off switch with pilot light.

Start, off and continuous control.

With the addition of an HF unit,
your constant-current power source
can handle welds on aluminum,
magnesium, thin stainless steel,
brass, copper and a wide variety of
both ferrous and non-ferrous alloys.

High-frequency intensity control.

Built-in postflow eliminates

contamination.

Protected secondary terminal.

Convenient, portable design can be

easily moved from location to location.

14-pin receptacle on front panel for
remote controls.

Warranted for 1 year, parts and labor.

Increase the flexibility and performance
of most AC, DC or AC/DC constant-current
welding machines with these portable

high-frequency arc starters and stabilizers.
The unit impresses high frequency on the
welding circuit and provides the arc control
needed for TIG welding.

HF-251

Specifications (Subject to change without notice.)

Model

HF-251D-1

HF-251-2

Input Volts

115 VAC, 50/60/100 Hz

230 VAC, 50/60 Hz

Net Weight

34 lb (15 kg)

36 lb (16 kg)

Rated Output at 60% Duty Cycle

250 A

Dimensions

H: 13 in (330 mm)
W: 9-1/4 in (235 mm)
D: 16 in (406 mm)

Genuine Miller Options and Accessories

Secondary Contactor
Kit

For HF-251D-1 model
#041 969 Field only

For HF-251-2 model
#041 906 Field only

Mounts inside HF-251 cabinet. For use
with a power source that does not have
its own contactor.

Remote Controls and Switches

Controls listed below are for use with Miller constant­current power sources with solid-state output control.
The controls are used when remote current control is
desired. The HF-251 is equipped with a 14-pin plug on
a 6 ft (1.8 m) cord for direct connection to new Miller
CC power sources. An adapter cord will be required
for older Miller equipment with 5-socket receptacles.

RMLS-14 #129 337

Momentary- and maintained-contact rocker
switch. 20 ft (6 m) cord with 14-pin plug.

RCC-14 #151 086

Attaches to the TIG torch handle to provide
contactor and current control. Includes 28 ft
(8.5 m) cord and 14-pin plug prewired.

RHC-14 #129 340

Miniature remote hand current and
contactor control. Includes 20 ft (6 m) cord
and 14-pin plug.

RFCS-14 #043 554

Foot pedal current and
contactor control.
Includes 20 ft (6 m)
cord and 14-pin plug.

Extension Cords
#122 973 25 ft (7.6 m)
#122 974 50 ft (15 m)
#122 975 75 ft (23 m)

Extends HF-251 farther from power source or
extends remote control farther from HF-251.

Adapter Cord #129 341

1 ft (305 mm) cord with 5-pin and 14-pin
plugs for use between 5-socket receptacle
power source and HF-251.

Adapter Cord #041 947

1 ft (305 mm) cord with 14-pin plug
and 5-socket receptacle for use between
HF-251 and 5-pin remote controls.

Water Coolant Systems

Coolmate™3
#043 007 115 VAC
#043 008 230 VAC

Delivers cooling capacity for torches
rated up to 600 A.

Coolmate

™

V3 #043 009 115 VAC

Cools torches rated up to 500 A.

Coolmate

™

4 #042 288 115 VAC

Cools torches and guns rated up to 600 A.

For use with water-cooled guns. Refer to
Literature Index No. AY/7.2 for additional
coolant system information.

Typical TIG (GTAW) Torches

Air-cooled Torches
#WP-17-25-2 (150 Amp)
#WP-26-25-2 (200 Amp)

Water-cooled Torches

(Requires

45VII Adapter)

#WP-18-25-R (350 Amp)
#WP-20-25-R (250 Amp)

1

1. Pilot Light

2. Power Switch

3. High Frequency Switch

4. High Frequency

Selector Switch

5. High Frequency

Intensity Control

Typical InstallationsControl Panel

Distributed by:

Litho in USA

Power Source and Options Stock No. Description Qty. Price

HF-251D-1 #042 388 115 V, 50/60/100 Hz
HF-251-2 #042 387 230 V, 50/60 Hz
Secondary Contactor Kit #041 969 For HF-251D-1 model. Field only

#041 906 For HF-251-2 model. Field only

Date: Total Quoted Price:

Ordering Information

2

4

3

5

Denotes Plug (Threaded Collar) Denotes Receptacle (External Threads)

1 ft (305 mm)
Adapter Cord

(#129 341)

Miller Power

Source

with 5-Socket

Receptacle

Optional Extension Cords

(See Options and Accessories

for Lengths Available.)

Miller Power

Source

with 14-Socket

Receptacle

Optional Extension Cords

(See Options and Accessories

for Lengths Available.)

Electrode Cable

Work Cable

Electrode Cable

Work Cable

To 115 Volt Supply – 10 ft (3 m)

To 115 Volt Supply – 10 ft (3 m)

6 ft (1.8 m) Cord

Supplied with HF-251

6 ft (1.8 m) Cord

Supplied with HF-251

HF-251

HF-251

Remote

TIG Torch

Work

Remote

TIG Torch

Work