Amada MT-520AC User manual

Y02M0806E-07
OPERATION MANUAL
WELDING TRANSFORMER
MT-520AC

MT-520AC
Thank you for purchasing our Welding Transformer MT-520AC.
・This operation manual explains its method of operation and precautions for use.
・Before using, read this operation manual carefully; after reading, save it in a proper place
where you can easily access.
Contents
1. Special Precautions .................................. 1
2. Features ..................................................... 5
3. Specifications ............................................ 5
4. Description of Operation .......................... 6
5. Wiring ......................................................... 7
6. Other Information ...................................... 7
7. Outline Drawing ......................................... 8

MT-520AC
1
Denotes operations and practices that
may result in personal injury or damage
to
the equipment if not correctly followed.
1. Special Precautions
(1) Safety Precautions
Before using, read "Safety Precautions"
carefully to understand the correct
method of use.
•These precautions are shown for safe
use of our products and for prevention
of damage or injury to operators or
others. Be sure to read each of them,
since all of them are important for
safe operation.
•The meaning of the words and
symbols is as follows.
Do not touch the inside of the Equipment unnecessarily.
Since very high voltages are charged to the inside of this Equipment, it is
very dangerous to touch it unnecessarily.
Any person other than service personnel, or authorized representatives’
personnel must not touch the inside.
Never disassemble, repair or modify the Equipment.
These actions can cause electric shock and fire.
If any part needs to be checked or repaired, contact us or your distributor for
help.
Never burn, destroy, cut, crush or chemically decompose the Equipment.
This product incorporates parts containing gallium arsenide (GaAs).
Denotes operations and practices
that may imminently result in serious
injury or loss of life if not correctly
followed.
DANGER
!
Denotes operations and practices
that may result in serious injury or
loss of life if not correctly followed.
W
ARNING
!
These symbols denote
"prohibition". They are
warnings about actions out
of the scope of the warranty
of the product.
These symbols denote
actions which operators
must take.
Each symbol with a triangle
denotes that the content
gives DANGER, WARNING
or CAUTION to the operator.
!
DANGER
!
CAUTION
！

MT-520AC
2
Do not put your hands between the electrodes.
When welding, keep your fingers and hands away from the electrodes.
Do not touch any welded part or electrodes during welding and just after
welding finished.
The welded part of a workpiece, electrodes and arm are very hot.
Do not touch them; otherwise you may be burnt.
Ground the Equipment.
If the Equipment is not grounded, you may get an electric shock when there
is trouble, or when electricity leaks.
Connect the specified cables securely.
Cables of insufficient current capacities and loose connections can cause
fire and electric shock.
Do not damage the power cable and connecting cables.
Do not tread on, twist or tense any cable. The power cable and connecting
cables may be broken, and that can cause electric shock and fire.
If any part needs to be repaired or replaced, consult us or your distributor.
Do not use any damaged power cable, connecting cable and plug.
That can cause electric shock, short circuits and fire.
If any part needs to be repaired or replaced, consult us or your distributor.
Stop the operation if any trouble occurs.
Continuous operation after occurrence of a trouble such as burning smell,
abnormal sound, abnormal heat, smoke, etc. can cause electric shock and
fire.
If such a trouble occurs, immediately consult us or your distributor.
Persons with pacemakers must stay clear of the welding machine.
A person who uses a pacemaker must not approach the welding machine or
walk around the welding shop while the welding machine is in operation,
without being permitted by his/her doctor. The welding machine generates a
magnetic field and has effects on the operation of the pacemaker while it is
turned on.
Protective gear must be worn.
Put on protective gear such as protective gloves, long-sleeve jacket, leather
apron, etc. Surface flash and expulsion can burn the skin if they touch the
skin.
Wear protective glasses.
If you look at the flash directly during welding, your eyes may be damaged.
If any Surface flash and expulsion gets in your eye, you may lose your
eyesight.
WARNING
!
!
!
!
!
!

MT-520AC
3
Apply the specified source voltage.
Application of a voltage out of the specified range can cause fire and electric
shock.
Do not splash water on the Equipment.
Water splashed over the electric parts, can cause electric shock and short
circuits.
Use proper tools (wire strippers, pressure wire connectors, etc.) for
termination of the connecting cables.
Do not cut the conductor of wire. A flaw on it can cause fire and electric
shock.
Install the Equipment on firm and level surface.
If the equipment falls over or drops from an uneven surface, injury may
result.
Do not sit on or do not put things on it.
Sitting on it, or putting things on it may cause malfunction.
Keep combustible matter away from the welding machine.
Surface flash and expulsion can ignite combustible matter. If it is impossible
to remove all combustible matter, cover them with non-combustible material.
Do not cover this Equipment with a blanket, cloth, etc.
If such a cover is used, it may be overheated and burn.
Do not use this Equipment for purposes other than welding.
Use of this equipment in a manner other than specified can cause electric
shock and fire.
Use ear protectors.
Loud noises can damage hearing.
Keep a fire extinguisher nearby.
Make sure there is a fire extinguisher in or near the welding shop in case of
fire.
Regularly inspect and maintain the Equipment.
Regular inspect and maintenance is essential to safe operation of the
equipment. If you see any damage, make necessary before starting the
operation.
CAUTION
!
!
!
!
!
!
!
!

MT-520AC
4
(2) Precautions for Handling
Install the Equipment on a firm and level surface. If it is used inclined or on its side,
it may have a malfunction.
Do not install this Equipment in the following places:
▪Where there is considerably damp (humidity is higher than 90%).
▪Where the ambient temperature is above 40°C or below 5°C.
▪Where there is nearby high noise source.
▪Where the Equipment may be exposed to chemicals.
▪Where moisture may be condensed on the surface of the Equipment.
▪Where there is considerable dirt.
▪Where the Equipment may be subjected to vibration or impact.
If the outside of the Equipment is stained, wipe it with a dry cloth or a moistened
cloth. If it is badly stained, use diluted neutral detergent or alcohol to clean it. Do
not use paint thinner, benzene, etc., which can discolor or deform the parts.
Do not put screws, coins, etc., in the Equipment, as they may cause a
malfunction.
Operate the Equipment according to the method described in this operation
manual.
(3) On Disposal
This product incorporates parts containing gallium arsenide (GaAs). At the time of
disposal, separate it from general industrial waste or domestic waste and carry out
the disposal in accordance with applicable laws and regulations.

MT-520AC
5
2. Features
The MT-520AC is the AC spot welding transformer suitable for welding small precision
components such as thin metal sheets.
3. Specifications
Rated Primary Voltage 200 V AC +/-10% 50/60 Hz
Rated Secondary Voltage OFF, 2.5 V, 3.2 V, 4.0 V, 5.0 V (without Load)
Turn Ratio 80:1, 63:1, 50:1, 40:1
Max. Secondary Current 3700 A
Allowable Duty Factor 1.5% or less
Standard Max. Input Capacity 18.5 kVA
Rated Capacity 3.2 kVA (Contracted Power Capacity)
Insulation Voltage 3 kV AC for 1 minute
Insulation Resistance 1000 V DC megger 50 M ohms or more
Operation Environment
Temperature 5°–40°C, Humidity 90% or less (Dew
condensation not allowed), Altitude 1000 meters or
lower
Caution: Use this product in the environment without
conductive dust. If conductive dust enters in
the product, this may result in a failure,
electric shock, or fire. When using this
product in this environment, make contact
with us.
Storage Environment Temperature -10°–55°C and dew condensation not
allowed
Heat-Resistant Class F
Case Protection IP20
Outline Dimensions 197 mm (H) × 182.5 mm (W) × 358 mm (D)
(Not including projections)
Mass 35 kg

MT-520AC
6
Duty Cycle Graph
4. Description of Operation
Connect the output cord from the welding control to the terminal board in the rear panel.
In 50Hz area, Connect to ''COM'' and ''50Hz'' and in 60Hz area, connect to ''COM'' and
"60Hz''. At this time, be sure to put OFF the power source of the welding control.
Connections must be made firmly.
For connecting the transformer to the head by a secondary cable, use the braiding cable
or copper plate which has 100 square mm or more, and connect it as short as possible. If
any dirt such as oil or metal scrap is stuck on the contact surfaces of connecting
terminals, or if there is a slack in the connection of the secondary cable, it causes to
lower the welding current or generate extra heat.
The output voltage can be switched to four steps (2.5 V, 3.2 V, 4.0 V, 5.0 V) by changing
“POWER” switch. According to the characteristic of the heads and type of a work to be
welded, switch the voltage for use.
Be careful to obtain the sufficient effect of heat release when the transformer is
assembled in the automatic welder and the like.
Since it leads to the excessive heat or breakage to use the transformer in the closed
condition or beyond the duty factor, it is very dangerous, so never use it in those
conditions.
Duty Factor = x 100 (%)
Also, if the capacity of the control is rather small, the control may break, so be sure to use
the proper welding control which fits to MT-520AC.
Current Running Time
Running Interval

MT-520AC
7
5. Wiring
6. Other Information
(1) Be careful to handle with the transformer because 200 V AC is applied on the primary
side.
(2) Do not put any voltage to the secondary, or it may break the control.
(3) Do not change “POWER” switch during supplying current.
(4) Be sure to connect a grounding cable.

MT-520AC
8
7. Outline Drawing
(Dimensions in mm)
3.2V
SPEC I F ICAT ION
MAX .DUTY CYCLE
MAX . INPUT CAPAC ITY
RATED CAPAC ITY
MAX . SECONDAR Y CURR EN T
INPU T VO L TAGE
OFF
2.5V
P0WER
M M - 0 0 0 4 1 - 0 0 1
:370 0A
:1 .5%
:18 .5 kVA
:3 .2kVA
:200V
±
10%AC50 /60Hz
5.0V
4.0V
COM
5 0 H z 6 0 H z
A C 2 0 0 V I N
B T - 0 0 2 2 2 - 0 0 1
182.5
140
30 11 46 234
311 (20)
37 102
10
(27)
2-φ9
(199.5)
197
(187.5)