Miller 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: 920-735-4505
USA FAX: 920-735-4134
Canadian FAX: 920-735-4169
International FAX: 920-735-4125
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)

Summary

Quick Specs

Input Power and Output Ratings

Details the single-phase input power requirements and the rated output amperage at a specific duty cycle.

Product Features

Power and Control Functions

Describes the unit's power switch, pilot light, start/stop controls, gas solenoid, and HF intensity adjustment.

Arc Stabilization and Protection

Specifications Table

Model and Input Voltage

Lists the available models (HF-251D-1, HF-251-2) and their corresponding input voltage requirements.

Rated Output and Dimensions

Details the rated output amperage at 60% duty cycle and the physical dimensions of the unit.

Net Weight

Specifies the net weight for each HF-251 model.

Control Panel Overview

Control Panel Components

Ordering Information

Product and Accessory Ordering

Miller HF-251 Specifications

General

Input Voltage	230 V
Input Frequency	50/60 Hz
Duty Cycle	60%
Open Circuit Voltage (OCV)	70 V
Phase	1
Processes	TIG
Weight	38 lb (17.2 kg)
Dimensions	17.25 H x 10 W x 21.25 D in. (438 x 254 x 540 mm)