Riland ARC 250GE User manual

ARC 250GE
WELDING MACHINE
USERMANUAL

Welcome to use our company’s welding machine!
For your own and other people’s safety, please read the manual carefully before
operating. And the user manual must always be available near the welding machine.
Announcement
The contents of this manual are updated irregularity for updating of product. The
manual is only used as operation guide, except for other promises. No warranties of
any kind, either express or implied are made in relation to the description, information
or suggestion or any other contents of the manual.
Version
Version YF-TAE-0127,A1. Released on August 27, 2020.
The images shown here are indicative only. If there is inconsistency between
the image and the actual product, the actual product shall govern.

Content
1 Safety warning.......................................................................................................................................3
2 Product ...................................................................................................................................................8
2.1 General........................................................................................................................................8
2.2 Technical data..........................................................................................................................10
3 Installation............................................................................................................................................11
4 Operation..............................................................................................................................................14
4.1 Front panel layout....................................................................................................................14
4.2 Operation instruction............................................................................................................... 14
4.3 Welding environment and safety...........................................................................................15
4.4 Welding problems and resolution.......................................................................................... 15
5 Daily maintenance and checking......................................................................................................17
6 Trouble shooting and fault finding....................................................................................................19
Appendix Ⅰ Welding parameter list...................................................................................................20
Appendix Ⅱ Circuit diagram................................................................................................................21

3
1. Safety warning
Security Definitions
It indicates that neglecting safety warnings may result in serious
accidents, even death or serious injury.
It indicates that neglecting safety warnings may result in minor
injury to personnel or property damage.
It indicates that neglecting safety warnings may result in
equipment failure or damage.
Personal Protection Precautions
◆Personnel with professional qualifications or relevant knowledge and skills are requested to
install, operate, maintain and repair the power source.
◆Installation, inspection and repair of power source must be carried out by electricians, and
temporary construction points should be connected by electricians.

◆Supervisors shall be provided for working in high altitude or narrow places, such as boxes,
boilers, cabins, etc.
◆Personal protective equipment, such as protective masks, overalls, insulating gloves and
insulating shoes, should be worn when working.
◆Those who use cardiac pacemakers shall not approach the power source in use and welding
workplaces without the permission of a physician.

5
Installation Operation Precautions
◆Before welding, the yellow-green grounding wire in the power line must be grounded and the
insulation of the welding cable must be ensured.
◆During welding operation, do not touch live parts such as workbench, welding parts, earth
clamp, electrode holder or welding torches.
◆Rubber insulation pads should also be laid on the ground near the operating table for welding
operations with high no-load voltage and in wet working places.
◆In the welding process, do not open the machine house and side cover.
◆Do not touch the electrically charged parts.
◆Do not use cables with insufficient cross-section, damaged insulation sheaths or exposed
conductors.
◆Maintenance operation should be carried out after 5 minutes of disconnection of the power
supply until the power indicator is completely turned off, otherwise there is a risk of electric
shock.
◆Turn off all input power when transferring work place, replacing fuse, repairing or not using
the equipment.
◆When welding steel plates with coatings or coatings, harmful fumes and gases will be
produced. Full ventilation or exhaust facilities should be used to keep fumes and toxic gases
away from the breathing area. If necessary, wear breathing protection tools.
The
power
source
shall
not
be
used
for
pipeline
thawing,
battery
load
or
motor
start-up.
Beware
of
Electric
Shocks
Beware
of
welding
fume
and
harmful
gases

6
◆When working in narrow places, such as boxes, boilers, cabins, etc., please accept the
inspection of supervisors. In order to prevent hypoxia, we should fully ventilate and wear
respiratory protective equipment.
◆Keep ventilation system of welding machine unblocked. The minimum distance between
power source and surrounding place should be greater than 0.5m. Do not cover the inlet and
outlet of equipment to ensure smooth circulation of cooling air.
◆Corresponding protective measures should be takenin the welding area to avoid fire caused
by welding mars.
◆Do not carry out welding operations in degreasing, cleaning and spraying areas.
◆Do not weld gas-filled pipes, sealing grooves (boxes) and other devices, otherwise
explosions or fires are likely to occur.
◆Do not weld near flammable gases or devices with flammable substances, otherwise
explosion or fire may occur.
◆When not welded, make sure that any component in the wire circuit does not contact the
workpiece or the earth, otherwise it may cause overheating and fire.
◆When the welding operation is stopped, remove the electrode in the welding pliers or cut off
the welding wire in the nozzle of the welding torch.
◆Those who use cardiac pacemakers shall notapproach the power source in use and welding
workplaces without the permission of a physician.
◆It is strictly forbidden to place or wrap welded cables around the body.
◆Do not place the bodybetween the welding wire and the workpiece cable. If the welding wire
cable is on the right side of the body, the workpiece cable should also be on the right side of
the body.
Welding
Sparks
May
Cause
Fire
or
Explosion
Electrical
Base
Field
May
be
Dangerous

7
◆When welding or supervising welding, please wear protective appliances with adequate
shading.
◆Protective barriers are set around the welding site to prevent arc or welding spatter from
injuring others.
◆Users should ensure that the welding power supply and other equipment in the environment
do not produce electromagnetic interference, otherwise corresponding shielding and
protection measures should be taken.
◆According to the manufacturer's suggestion, the power source should be connected to the
main power supply line.
◆The length of welded cables should be shortened as far as possible to make them close to
each other and to the ground.
◆Safety of all metal assemblies assembled by welding and the assemblies connected with
them should be confirmed.
◆The yellow-green grounding wire in the power line must be grounded, and the workpiece
must be well connected with the ground clamp.
◆Users should be responsible for the interference caused by welding.
◆In order to avoid the harm of noise to you and others, please wear the prescribed protective
equipment.
Arc
Rays
May
Cause
Burns
Avoiding
Electromagnetic
Interference
Noise
Produced
during
Welding
can
Easily
Cause
Hearing
Loss
Cautions
for
Hoisting

8
◆The power source with strap or handle is prohibited from using strap or handle for lifting.
◆When lifting power source with lifting forklift truck, in order to prevent dumping, please fork-
fit and fix it from side.
◆When lifting power source with crane, the cable should be tied to the suspension ring, and
the angle between the cable and the vertical direction should not exceed 15 degrees.
◆When the power source with cylinder and wire feeder is hoisted, the two equipments should
be unloaded from the power supply first.When moving the power source on the ground, it is
necessary to fix the cylinder with a strap or chain to prevent dumping and injuring people.
◆If the wire feeder is hoisted by lifting lugs for welding, it is necessary to ensure that it is firm
and insulated.
1 Product
1.1 General
Themachinewith MMAfunction,is digitalfunctionweldingmachinethatapplythe most advanced
inversion technology in the world.
The principle of inversion is to transform the power frequency of 50Hz/60Hz into direct current
and invert it into high frequency (33KHz) through high-power device IGBT, then perform voltage-
drop and commutation with the output high-power D.C power supply via full digital Pulse Width
Modulation (PWM) control technology. Since the switch power inversion technology is adopted,
the weight and volume decrease greatly while the conversion efficiency increase for more than
30%.
Our welding power source can offer stronger, more concentrated and more stable arc. When the
welding rod and work piece get short circuit, its response will be quicker. It means that it is easy
to design welding machine with different dynamic characteristics, and it can even adjust the
characteristics to make arc softer or harder.
Rings
Handle