Amada MT-25 User manual

Y02M0038E-08
OPERATION MANUAL
WELDING TRANSFORMER
MT-25

MT-25
Thank you for purchasing our Welding Transformer MT-25.
・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. Introduction....................................................... 1
2. Specifications ................................................... 5
3. Connection ........................................................ 5
4. Precautions ....................................................... 7
5. Outline Drawing ................................................ 9

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1
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 safety.
・The meaning of the words and
symbols is as follows:
Do not touch the “Terminal block” of the Welding Transformer.
Since very high voltage is applied to the “Terminal block”, it is very
dangerous to touch it unnecessarily. When connecting or disconnecting a
cable, be sure to turn off the power. After connecting the cable, install the
terminal cover so that operator can not touch the terminal block during
work.
Never disassemble, repair or modify the Transformer.
These actions can cause electric shock and fire. Consult your distributor or
us for repair and maintenance.
Never burn, destroy, cut, crush or chemically decompose the
Transformer.
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.
Denotes operations and practices that
may result in serious injury or loss of
life if not correctly followed.
DANGER
!
WARNING
!
DANGER
!
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
notice of DANGER, WARNING
or CAUTION to the operator.
Denotes operations and practices that
may result in personal injury or damage
to the equipment if not correctly followed.
CAUTION
!

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Do not touch the Transformer or the secondary conductor during
welding and just after welding finished.
These parts are very hot. Do not touch them; otherwise you may be burnt.
Ground the Transformer.
If the Transformer is not grounded, you may get an electric shock when
there is trouble, or when electricity leaks.
Ground the Transformer with the Transformer mounting hole and the hole
for eyebolt.
Use the rated voltage; the input voltage is up to 200 V AC.
Applying a voltage exceeding rated voltage can cause abnormal heat and
fire.
Securely connect only specified cables.
Use of a cable of insufficient capacity or loose connection can cause fire
and an electric shock.
Do not damage the connecting cables.
Do not tread on, twist or tense any cable. The connecting cables may be
broken, and that can cause electric shock, short and fire. When repairing or
replacing, 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 transformer.
A person who uses a pacemaker must not approach the welding
transformer or walk around the welding shop while the welding transformer
is in operation, without being permitted by his/her doctor. The welding
transformer generates a magnetic field and has effects on the operation of
the pacemaker while it is turned on.
WARNING
!

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3
Do not splash water on the Transformer.
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 wire conductor. A flaw on it can cause fire and electric shock.
Install the Transformer on firm and level surface.
If the Transformer falls or drops, injury may result.
Use the Transformer with water-cooled.
If the Transformer is not used with water-cooled, that can cause
malfunction and fire.
Do not place a water container on the Transformer.
If water spills, insulation will deteriorate, and this may cause electric leak
and fire.
Keep combustible matter away from the Transformer.
Spatter can ignite combustible matter. If it is impossible to remove all
combustible matter, cover them with non-combustible material.
Do not cover this Transformer with a blanket, cloth, etc.
Do not cover this Transformer with a blanket, cloth, etc. while you are using
it. The cover may be overheated and burn.
Do not use this Transformer for any purpose other than welding.
Use of this Transformer in a manner other than specified can cause electric
shock and fire.
Keep a fire extinguisher nearby.
Keep a fire extinguisher in the welding shop in case of fire.
Maintain and inspect the Transformer periodically.
Maintain and inspect the Transformer periodically, and repair any damage
nearby before starting operation.
CAUTION
!

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(2) Precautions for Handling
■When transporting or moving the Transformer, do not lay it down. Also, handle the
Transformer with care so as not to make an impact such as drop on it. Moving the
Transformer by hand must be done by at least four people.
■Install the Transformer on a firm and level surface. If it is used inclined or on its side,
it may have a malfunction.
■Do not install this Transformer in the following places:
Damp places (where humidity is higher than 90%), dusty places,
places near a high noise source, places where water will be condensed,
hot or cold places (where temperatures are above 40°C or below 5°C),
places where chemicals are handled, and places at an altitude above 1000 meters
■Do not apply any voltage to the secondary of the transformer. Weld Control may be
damaged.
■Clean the outside of the Transformer with a soft, dry cloth or one wet with a little
water. If it is very dirty, use diluted neutral detergent or alcohol. Do not use paint
thinner, benzine, etc., since they can discolor or deform the Transformer.
■Operate the Transformer according to the method described in this operation
manual.
■The Transformer is not equipped with auxiliary power such as an outlet for lighting.
■The welding power supply, the welding head, and the secondary cables for
connecting the welding power supply, the welding head and the Transformer are
separately needed to use the Transformer.
■When installing the Transformer, enclose it in a case or the like not to touch the
terminal block.
(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.

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2. Introduction
The MT-25 AC Spot Welding Transformer is suitable for precision welding of small thin
metal parts.
3. Specifications
Rated primary voltage 200 V AC ±10% 50/60 Hz
Rated secondary
voltage
2.6 V, 4.0 V (Parallel connection),
5.3 V, 8.0 V (Series connection)
Turn ratio 77:1, 50:1 (Parallel connection),
38:1, 25:1 (Series connection)
Max. secondary current 8000 A
Allowable duty cycle
1.5% max.
Duty cycle = intervalWeld
timeWeld x 100 (%)
Standard max. input
capacity 64.0 kVA
Rated capacity 11.1 kVA (Contracted power)
Cooling water 4 liters/minute or more
Dielectric strength 3 kV AC for 1 minute
Insulation resistance 50 MΩor more by 1000 V DC Megger
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 240 mm (H) × 180 mm (W) × 370 mm (D)
Mass 60 kg

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■Duty Cycle Graph

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4. Connection
(All items are sold separately
except for MT-25.)
Disconnect the Weld Control off the line before connecting the transformer.
Connect the output cable of the Weld Control to the primary terminals mounted on
the upper side of the transformer; connect wires to terminals "0" and "H", or
terminals "0" and "L", whichever can supply your desired current (see table below).
<Connection method and tap voltage>
Output terminal
Terminal block Parallel Series
0-L 2.6 V 5.3 V
0-H 4.0 V 8.0 V
Connect the secondary conductor and the short-circuit conductor to output
terminals.
See Fig. A for series connection; Fig. B for parallel connection.
A
Timer
危
険
Input
Contactor
Breaker
OHL
Ground the Transformer
with the mounting screw.
MT- 25
Secondary
conductor
Short-circuit
conductor for series
(built in at factory)
Secondary
conductor
As the tap voltages go higher,
the welding current increases.
Set the tap voltage suitable for
the workpiece.

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B
Connect the cooling water hoses.
Connect the hoses with φ9 inner diameter as shown below and fix them securely
with hose bands. The directions of inlet and outlet may be the same as shown
below or opposite.
Make a flow test and check for water leak.
Connection of the welding transformer is now complete.
If a weld control of small capacity is used, it may be damaged.
Be sure to use the weld control of sufficient capacity for the welding
transformer.
Short-circuit
conductor for parallel
(to be prepared
by customer)
Secondary
conductor
Inlet
Outlet
Hose
band
ATTENTION
For the secondary conductor and the short-circuit conductor, use braided wires
or copper bars of at least 200 mm2; make the wires or bars as short as possible.
Be sure to avoid oil, metal debris, etc. on the contact surfaces and loose
connections because they may cause overheating or welding current to lower.
CAUTION
！

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5. Outline Drawing
(Dimensions in mm)
200
240
50
260
60
Mounting holes pitch 230 20
15
45
180
370
Terminal blockEyebolt (removable)
70 ±3
60±3 Mounting holes pitch
100
Mounting holes 4-φ9
Water inlet/outlet φ9
32
Mounting holes for secondary conductor φ12.5
17
100±3