INTRODUCTION
CAREFULLY READ THIS MANUAL BEFORE INSTALLING
AND OPERATING WELDER.
The purpose of this instruction manual and of the enclosed
documents is to transfer the necessary information for using the
product in a proper and safe way. It includes pieces of
information relevant to safety, installation, use, maintenance and
disposal of the product.
This manual is addressed to the factory responsible in charge
who must release it to the personnel in charge of the welder
installation, use and maintenance. He/she must check that the
information given in this manual and in the enclosed documents
have been read and understood before operating on the welder.
The manual must be stored in a well-known place, easy to
reach, and must be looked up each time even little doubts
should arise.
The welders marked with suffix P are equipped with the pulse
functioning mode.
These welders must be installed in industrial environments for
professional use
only and are classified as class A resistance
welding equipment. This product is foreseen for being used neither
in domestic environment nor on low voltage public supply mains
supplying domestic buildings. This may cause radiofrequency
interferences.
All modifications, even slight ones, are forbidden because they
could compromise the machine’s safety and should invalidate
both the welder EC certification and warranty. The welder has
been designed for resistance spot welding of both ferrous and
not ferrous (stainless steel, brass) materials. The welder must
not be used for other application.
TECNA S.p.A is not responsible for any damage to both people,
animals, things and to the welder itself caused by either a wrong
use or the lack or the superficial observance of the safety
warnings stated on this manual, nor it is responsible for
damages coming from even slight tampering or from the use of
not-suitable spare parts, or of spare parts other than the original
ones.
Only
for EU countries:
In accordance with European Directive 2002/96/EC
for waste electrical and electronic equipment
(WEEE), the presence of this symbol indicates that
the product shall not be disposed of as urban
waste. A separate collection must be arranged for.
It is the user’s responsibility to dispose of this product correctly.
They should contact their local authority or retailer.
The unlawful disposal of these wastes is punished with
sanctions.
The correct disposal helps to optimize the recovery, the recycling
and the reclaim of any materials and also reduces potential
negative consequences for the environment and human health.
STANDARD ACCESSORIES
The welder is supplied equipped with:
N° 1 Allen key 5 mm.
N° 1 additional handle.
N° 1 electrode sharpener
10 (only items 7900).
N° 1 electrode sharpener
12 (only items 7902).
N° 1 pair of arms item 7501 L=125 mm (only items 7900).
N° 1 pair of arms item 7401 L=125 mm (only items 7902).
N° 1 instruction manual.
Item 7903 does not include the arms which must be ordered
separately (see the accessories paragraph, page 36).
TECHNICAL FEATURES
Spot welder type 7900 7902 7903
Synchronous timer with SCR • • •
Time adjustment cycles
2
65 2 65
2÷65
Current adjustment 40 100%
- • •
Cooling Air Air Water
Mains supply 50 Hz * V 400 400 400
Nominal power at 50% kVA 2 2.5 6
Max. welding power kVA 13 16 16
Max. short circuit current
with arms L=
kA
mm
7.2
125
8.2
125
8.2
125
Thermal current at 100% A 610 700 1700
Secondary no load voltage V 2.3 2.5 2.5
Insulation class F F F
Cooling water quantity l/h - - 150
Max. water pressure bar - - 2.5
Max. force on electrodes
with arms L=
daN
mm
120
125
120
125
120
125
Standard arms throat depth L mm 125 125 -
49 49 69 mm pag smrA
Max. electrodes stroke
with arms L=
mm
mm
55
125
55
125
70
150
Weight with arms 125 mm kg 10.5 11 -
Weight with arms 150 mm kg - - 12
Weight with arms 500 mm kg 13 13.5 13.6
Aerial noise dB(A) < 70 < 70 < 70
Level of vibrations m/s
2
< 2.5 < 2.5 < 2.5
Measurement conditions:
welding time (cycles)
welding current (kA)
working rating (welds/min)
14
5
2
14
5
2
20
6
6
* Different voltages and frequency available on request
INSTALLATION
On receipt of the welder, verify the perfect integrity of the outer
package; communicate to a responsible in charge possible
anomalies which should be noticed. Possible damages on the
outer package should arise some doubts on the integrity of its
content. Remove the package and visually verify the welder
integrity. Check that the welder is equipped with all the standard
components; immediately inform the manufacturer in case some
components should lack. All the material forming the package
must be removed according to the present environmental
protection regulations.
ELECTRICAL INSTALLATION
The welders described in this instruction manual have been
designed for being used only for a professional purpose in an
industrial environment and are classified as class A resistance
welding equipment. WARNING: the class A resistance welding
equipment are not fore
seen for being used on low voltage public
mains supplying domestic environments. This may cause
radiofrequency interferences.
Installation must be carried out by specialised personnel only,
aware of all safety rules. As this unit can be supplied for different
power supply versions, before connecting the unit to the power
line, check if the voltage shown on the features plate
corresponds to the one of your power supply.
Consult table 5 to determine the capacity of the plug which must
be installed on the supply cable; all use without plug is forbidden.
The supply cables are brown and light blue, the earth cable is
yellow / green.
It is compulsory to connect the welder to the protection
conductor (earth). Verify that the protection conductor of
the equipment is efficient and corresponds to the law in
f
orce.
The cables section to be used according to their length is stated
on table 5. Examples of mains connections are shown on figure
6; the solution assuring the best safety is that with a residual
current circuit breaker (RCCB). On the contrary, install fuses of
the type stated on table 5.
7900 - 7902 / 7902P - 7903 / 7903P
DIRECT.COM
4943 Driscoll Road ¥ Warrensville Heights, OH 44146 USA
www.TECNADirect.com
PAGE 07
844-44-TECNA
DIRECT.COM
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