1
1.
About safety
1.1
Safety precautions
Read this manual carefully to use the machine properly.
The cautions mentioned in this manual and on the
product are important to operate the machine properly
and prevent hazardous situation and damage to you and
other personnel.
This document classifies all of these hazardous
conditions into three levels, namely Danger, Warning or
Caution, and indicates these levels by using symbols.
Those Dangers, Warnings, Cautions as well as
Mandatory Actions and Prohibitions mentioned must be
followed without fail. It is also important to ensure that
equipment functions correctly at all times. * The warning
symbols and signal phrases are also used on the warning
labels attached on the machine.
“Serious personal injury” refers to loss of eyesight, burns
(high-temperature and low-temperature burn), electrical
shock, bone fractures and gas poisoning, as well as those
that leave after-effects, which require hospitalization or
necessitate medical treatment for an extended period of
time. “Medium-level and light personal injury” refers to
burns, electrical shock and injuries which do not require
hospitalization or necessitate medical treatment for an
extended period of time. “Property damage” refers to
extensive damage to the surrounding items and
equipment.
1.2
Safety instructions that must be observe
Welding power source
(
1
)
Never use the welding power source for other than
welding purpose. (e.g. Never attempt to use the
welding power source for pipe thawing.)
(
2
)
It is very important to comply with all instructions, safety
warnings, cautions and notes mentioned. Failure to do
so can result in serious injury or even death.
(
3
)
Work of driving source at the input side, selecting
work site, handling, storage and piping of high
pressure gas, storage of welded products and also
disposal of waste should be performed according to
the operating instruction and national, state and local
codes and regulations.
(
4
)
Prevent any unauthorized personnel to enter in and
around the welding work area.
(
5
)
Only educated and/or skilled persons who well
understand this welding power source should install,
operate, maintain and repair the unit.
(
6
)
Only educated and/or skilled persons who well
undersand the operating instruction of the unit and
are capable of safe handling should perform
operation of the unit.
Against electric shock
(
1
)
Grounding of the case of the welding power and
base metal or a jig electrically connected to the base
metal must be performed by educated and/or skilled
persons.
(
2
)
Before installation or maintenance work, turn off
power at the power box, wait it for at least five
minutes to discharge capacitors. Significant voltage
may exist on capacitors after turning off power at the
power box so it is imperative to check to make sure
that no charged voltage present at capacitors before
touching any parts.
Warning
symbol
Signal
phrase
Description
Warning
symbol
Signal
phrase
Description
Danger
A hazardous accident including death
or serious personal injury is imminent, if
directions are not followed carefully.
Mandatory
Action
Action which MUST be
performed without fail,
such as grounding.
Warning
The potential for a hazardous accident
including death or serious personal
injury is high, if directions are not
followed carefully.
Prohibition
Action which MUST
NOT be performed.
Caution
The potential for hazardous accident
including medium-level or light personal
injury and/or the potential for property
damage to the equipment are high if,
directions are not followed carefully.
The above warning symbols are commonly used.
WARNINGS
Observe the following instructions to prevent
the hazard.
Observe the following instructions to prevent
the hazard.
About safety
Summary of Contents for YD-350GL4
Page 45: ...41 1 2 3 4 5 6 7 8 9 10 11 12 13 14 14 40 41 43 44 45 Right view Left view Parts list ...
Page 49: ...45 1 2 3 4 5 6 7 8 9 10 11 12 13 14 14 40 41 43 44 45 Right view Left view Parts list ...
Page 53: ...Circuit diagram 49 13 1 Circuit diagram for 500GL4 100V 100V Optional parts 300 248 ...