NewArc Viper 2500s User manual

To maintain continued developments of our products we reserve the right to alter specifications as quoted without prior notice
Newarc Equipment Ltd.
UK‘s Leading Manufacturer Of elding Equipment
Newcastle [phone]
Aberdeen [phone]
www.newarc.co.uk
Processes
Description
Viper2500s
Important Information
All persons authorised to use, repair or service the Viper 2500s Line
operated TIG control unit , should read the section on safety before
any work is undertaken. Further information is available in publication
HSG118 'Electric safety in arc welding', which may be obtained from
the Health & Safety Executive. Please contact your distributor should
you not understand any of the information within this document.
TIG unit
INSTRUCTION MANUAL

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Viper2500s
SECTION 1 — SA ETY
1.1 Servicing Hazards ______________________________________________
4
SECTION 2 — SPECI ICATION
2.1 - Description_______________________________________________________________ 5
2.2 - Technical Data___________________________________________________________ 5
SECTION 3 — INSTALLATION
3.1 - Siting the Viper2500s______________________________________________________ 6
3.2 - Connection of Cables___________________________________________________ 6
SECTION 4 — OPERATION AND USE
4.1 - Operating Controls and Connections___________________________________ 7
4.2 - Operation_____________________________________________________________ 8
SECTION 5 — AULT INDING AND MAINTENANCE
5.1 - Fault Finding___________________________________________________________ 9
5.2 - elding Problems______________________________________________________ 9
5.3 - Maintenance__________________________________________________________ 10
SECTION 6 — PARTS BREAKDOWN
6.1 - Component Locations__________________________________________________ 12
6.2 - Parts List_______________________________________________________________ 14
TABLE O CONTENTS

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Viper2500s
1.1 ire and Explosions
Pay attention to fire and safety regulations in force
at the welding site.
• Remove all flammable or combustible materials from
the welding area and the immediate vicinity.
• Suitable fire fighting equipment must always be pre-
sent where welding is carried out.
• Be aware that a fire risk is present for a considerable
time after welding operations have ceased because
of sparks and hot slag etc. Take suitable precautions
when you have finished welding.
• Take care when welding containers that have held
flammable or combustible material, these should have
been specially cleaned before being made available
to the welder. If in doubt do not proceed.
1.2 Burns
Be aware that burns may be the result of the heat involved
in the welding process, welding spatter or the Ultra Violet
Radiation given off by the arc itself.
• ear suitable flame retardant clothing over all your
body.
• ear protective gauntlets designed for welding use.
• ear a welding facemask fitted with the correct filter
shade suitable for the current at which you will be
welding.
• Avoid wearing oily or greasy clothing as a spark may
ignite them. here possible ensure that a suitable first
aid kit and a first aid person qualified in the treatment
of burns are available nearby.
1.3 umes
Welding operations give off harmful fumes that are haz-
ardous to your health.
• Make sure the welding area is well ventilated. Use suit-
able fume extractors or exhaust fans if necessary.
• If the ventilation is not suitable then breathing appara-
tus may have to be used.
• Do not weld plated metals or metals which contain
Lead, cadmium, Zinc, Mercury or Beryllium unless you
are wearing breathing apparatus approved for the
purpose.
1.4 Electric Shock
Note! Electric shocks can be atal
• Do not touch live electrical parts.
• Do not work in wet or excessively humid areas and do
not site the Viper 2500s on a wet surface.
• Avoid touching the work piece whilst welding.
• Do not use the Viper 2500s without it’s protective cover
• Keep your clothing and body dry
1.5 The safe handling of gas cylinders
The Viper 2500s uses argon gas during TIG welding. This is
an inert gases and can displace oxygen in the atmosphere
leading to asphyxiation.
• Note! Gas cylinders are under pressure and can explode
if punctured. Please ensure the cylinder is secured in a
stable location away from any heat source or potential
mechanical damage.
• Check the gas cylinder, pressure regulator and gas hoses
regularly for leaks and discard any suspect item.
• Do not try to directly connect a gas cylinder to the Viper
2500s without using a pressure-reducing regulator de-
signed for use with argon.
• Do not use gas cylinders whose contents you are unsure
of.
• The cylinder must be securely fastened to a wall or
placed in a specially designed cylinder carrier.
• Always turn off the valve on the gas cylinder when you
have finished welding.
• Always install and use pressure regulators in accordance
with the manufacturers instructions.
• It is advisable, when attaching the regulator to the gas
bottle, to briefly turn on the bottle valve to expel any
foreign objects that may be present. These may later
block the solenoid valve of the machine if not dealt with.
Turn your face away from the bottle valve when under-
taking this action.
urther information is available in publication HSG118
'The safe use of compressed gases in welding, flame
cutting and allied processes', which may be obtained
from the Health & Safety Executive.
1.6 Welding and earth return cables
• Earth return and electrode holder cables must have a
cross sectional area of at least 35mm
2
.
• Only use copper cables, the use of Aluminium cables
may have a detrimental effect on the performance of
the machine.
• Regularly inspect welding cables and connectors for
wear abrasion and corrosion. Corroded cables and con-
nectors may overheat and become a fire hazard.
• Ensure that all welding connectors are fully mated, the
connectors should be pushed fully home and then turned
clockwise to lock. If the connectors are not mated fully
they may overheat and become a fire hazard.
• If possible, fasten the earth return clamp directly to the
job to be welded and ensure that the surface is free from
rust and paint.
SECTION 1 — SA ETY

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Viper2500s
SECTION 2 — SPECI ICATION
2.1 Description
The Viper 2500s is a universal add-on 250 amp line operated TIG control unit for any DC welding genera-
tor or rectifier.
It provides High Frequency ignition, control of the output current, slope in and out times and gas timing.
The Viper 2500s is a self contained unit that only requires welding cables to connect it, extra control and
power cables are not required.
The generator or rectifier is simply set to maximum output and the Viper 2500s can then be used to con-
trol all the welding parameters.
Note that as the Viper 2500s is a self-contained control unit it is possible to slope down to 5 amps even if
the generator has a minimum current of 50 amps or greater.
Advanced eatures
• New "Ducted Air" design:
The Viper 2500s is built around an Aluminium air duct that channels cooling air over the power com-
ponents and offers greater environmental protection for the electronic control circuitry.
• Accurate current calibration:
No longer do you have to rely on the welding generator or rectifier to be accurately calibrated as the
Viper 2500s controls the welding current to within 5% accuracy. A bright digital display is used for cur-
rent indication.
• Powerful electronic arc ignition:
The advanced arc ignition system contains no moving parts or spark gap providing long term reliabil-
ity even in humid conditions.
2.2 Technical Data
Technical data Viper 2500S
Input Voltage Range 30-100 Volts
Maximum Output Current 250 amps
Current control Infinitely Variable
Duty Cycle TIG/MMA 100% @ 250amps
Degree of Protection IP23
H x x L (mm) 300 x 190 x 450
eight (kg) 14
Gas Flow Meter Yes

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Viper2500s
SECTION 3 — INSTALATION
3.1 Siting the Viper 2500s
• Site the Viper 2500s on a clean dry surface, preferable above ground level.
• Make sure there is at least 20cm clearance at the front and rear of the machine to allow good circulation of the
cooling air.
• Protect the machine from heavy rain and if used in hot climates, against direct sunlight.
• Ensure that the machine is positioned in such a way so that particles created by grinding and cutting operations do
not enter the machine.
Note! Damage caused by metal particles and water entering the machine are not covered under warranty.
3.2 Connecting welding cables
Refer to safety precautions in section 1.6
Only use copper welding cables with a cross sectional area of 35mm
2
or more. Connect the power cables as be-
low :-
• Connect the negative (-ve) cable from the power source to the ‘negative in’ connector on the rear of the Viper.
• Connect the positive (+ve) cable from the power source to the ‘positive in’ connector on the rear of the Viper.
Connecting for MMA operation
• Connect the Electrode Holder to the positive out connector on the front of the Viper.
• Connect the Earth return lead to the negative out connector on the front of the Viper.
Note! hen using a reverse polarity procedure, always swap the polarity of the output cables.
NEVER swap the polarity of the input cables.
For TIG Operation Connect Cables as Above
INVERTER POWER SOURCE

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Viper2500s
4.1 Operating controls & connections
1 Gas flow control
Adjusts the flow of gas to the welding torch, a flow rate of 15 to 20 lpm is normally used.
2 Torch switch socket
For connecting the TIG torch control switch lead using XLR plug.
3 Torch switch socket
For connecting the TIG torch control switch lead using DIN plug.
4 Post Gas time
This control sets the post gas delay, This is the period of time that the gas will continue flowing after the arc has extin-
guished. The length of this period is determined by the position of the control.
5 Slope up control
ith the slope up control set to minimum the Viper will strike at the current set by the current control. ith the slope up
control set to anywhere but minimum the Viper will strike at 30A and then gradually increase the current to the setting
on the current control, the time this takes is determined by the position of the slope up control.
6 Current control
Use this on MMA and TIG to set the output current of the Viper.
7 Slope down control
ith the slope down control set to minimum the current will shut down immediately the torch switch is released. ith the
slope down control set to anywhere but minimum and the torch switch released, the current will gradually decrease
from the setting on the current control to 5 amps, where the current will extinguish, the time this takes is determined by
the position of the slope down control.
8 TIG/MMA switch
This control switches the Viper's operating mode between MMA and TIG .
9 TIG2/TIG 4 switch
This control switches between 2s and 4s operation (normal and latch). In TIG2 position, when the torch switch is pressed
the arc ignites, when the switch is released the arc goes out. In TIG4 position, when the torch switch is pressed and re-
leased the arc ignites, to extinguish the arc you must press and release the torch switch again.
10 Digital Display
Gives an accurate indication of the welding current.
SECTION 4 — OPERATION AND USE

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Viper2500s
11 Power -on indicator
Indicates that the Viper is receiving power from the power source it is connected to.
12 Warning Indicator
Indicates that the Viper is connected in reverse polarity, i.e. the positive lead from the power source is connected to the
negative in terminal on the rear of the Viper and vice-versa. The set will not operate in this condition.
13 Thermal cut-out Indicator
Indicates that the thermal cut-out in the machine has operated. (see paragraph 5.1 in the fault finding and mainte-
nance section for possible reasons) control to set the desired welding current, the digital display will indicate the setting.
14 Gas out connector
This is a female quick coupling with an internal shut- off valve.
To connect, push the male connection on the end of the TIG torch adaptor into the coupling until you hear a click. To
fully disconnect, push the knurled ferrule on the connector inwards towards the Viper until it stops.
The shut off valve in the connector automatically closes when the connection is separated.
15 Positive out connector
Main welding power output connector, positive polarity .
16 Negative out connector
Main welding power output connector, negative polarity.
17 Positive in connector
Main power in connector, must be connected by welding cable to the positive terminal of the power source .
18 Negative in connector
Main power in connector, must be connected by welding cable to the negative terminal of the power source.
19 On/Off switch
Switches the Viper on and off.
20 use Holder
Holds the main protection fuse for the Viper .
21 Gas In connector
Must be connected to the pressure regulator on the gas cylinder by means of a suitable hose.
22 Remote control socket
For connecting external remote control units, these are the RC300 remote control, the RPC300 pulse unit and the RFP300
foot pedal. There is no switch for remote operation, plugging an external unit into the socket automatically selects re-
mote operation and disables the internal current control.
4.2 Operation
4.2.1 MMA Operation
• Connect the Viper as per paragraphs 3.2 of the Installation section.
• At the power source, turn the power on and the current control to maximum.
• Turn the TIG/MMA switch on the front panel to the MMA setting.
• Press the On/Off switch on the rear panel to the on position, the power on indicator and the digital display will light
and the Viper is ready to use.
• Turn the current control to the setting required for the task in hand.
4.2.2 TIG Operation
• Connect the Viper as per paragraphs 3.2 of the installation section
• At the power source, turn the power on and the current control to maximum.
• Turn the TIG/MMA switch on the front panel to the TIG setting.
• Turn the TIG2/TIG4 switch to the desired mode of operation.
• Press the On/Off switch on the rear panel to the on position, the power on indicator and the digital display will light
and the Viper is ready to use.
• Turn the current control to the setting required for the task in hand.
SECTION 4 — OPERATION AND USE

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Viper2500s
5.1 ault inding
Most problems with the operation of the Viper will be indicated by the three indicator lights on the front panel.
5.1.1 Power on Indicator.
Must be on for normal operation. Indicates whether or not the Viper is receiving power from the power source. If off
check that:-
• The power source is switched on.
• The leads between the power source and the Viper are connected.
• That the on/off switch on the rear of the Viper is in the on position.
• If all above are satisfactory check the condition of the fuse in the rear panel fuse holder.
5.1.2 Warning Indicator
Must be off for normal operation. If on it indicates that the Viper is connected "reverse polarity" i.e. the positive in con-
nector is connected to the negative terminal of the power source and vice-versa, swap the positions of the connec-
tors at either the power source or the rear of the Viper. It is good practice to mark one of the cables at both ends with
red tape and to use this as the positive lead.
5.1.3 Thermal cut-out indicator
Must be off for normal operation. If on it indicates that the Viper has overheated and the power stages of the Viper
have been shut down, so you will get no current output.
In normal climate conditions (below 25°C) the Viper has a 100% duty cycle, so operation of the thermal cut out is
indicative that the inside of the machine is likely choked with dust and therefore not being cooled properly.
In Hot climates (above 25°C) It indicates that you are exceeding the duty cycle of the Viper, leave switched on for a
few minutes without use and the Viper will return to normal operation. In this circumstance, do not switch the Viper off
as this will stop the operation of the cooling fan and greatly extend the cool down period. Frequent tripping of the thermal
cut-out, especially at low current settings indicates that the inside of the machine is choked with dust.
or information about cleaning the dust out of the Viper please refer to the relevant part of section 5.3.2, the three
monthly service schedule.
Any operating problems not covered above means the Viper must be checked by a trained maintenance person.
5.2 MMA Welding Problems
If problems with the Vipers operation while MMA welding are experienced first refer to the information in paragraphs 3.1
and 3.2 in the installation section and paragraph 4.3.1 in the operating section .
• Most problems with the MMA welding procedure are the result of not setting the correct welding parameters
for the welding rod being used.
• All welding rod packets have information on them in symbolic format, giving suitable current range, polarity
and type of weld (normally called 'position').
• If you are in doubt about what these symbols mean, ask your welding rod supplier to explain them.
• Choose an initial current setting towards the middle of the quoted range and if necessary practice on a piece
of waste material the same type and thickness as the job to be welded.
5.3 TIG Welding problems
If problems with the Vipers operation while TIG welding are experienced first refer to the information in paragraphs 3.1
and 3,2 of the installation section and paragraph 4.2.2 in the operating section.
SECTION 5 — AULT INDING AND MAINTANENCE

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Viper2500s
The common problems with TIG welding are poor or no striking, porosity and poor appearance of the weld. If you are
experiencing any problems with TIG welding follow the check list below, this will cure most problems :-
• If the Viper does not strike check the operation of the torch switch and the condition of the switch lead and
plug.
If the Viper is suffering from poor striking, check that all power leads are connected properly, check that
there is sufficient
• gas flow and that the correct gas is being used, check that the earth clamp is making a good connection to
the work-piece.
• If there is porosity in the weld or the final weld is of poor appearance, check that there is sufficient gas flow
and that the correct gas is being used, check the condition of the TIG torch, particularly the gas hose. Make
sure that the collet or gas lens in the torch head is not blocked in anyway. Check all gas connections are tight
and that there are no leaks, use a leak detecting spray on all connections if necessary.
Any welding problems not covered above must be brought to the attention of a qualified elding Engineer, if the prob-
lem still persists have the Viper checked by a trained maintenance person.
5.3 Maintenance
Note! All Electric shocks are potentially fatal, switch off the machine and unplug from the
mains supply before carrying out any maintenance work.
It is very important that the Viper2500S is regularly maintained. The amount of use and the working environment must be
taken into account when scheduling the maintenance periods.
Careful use and regular preventative maintenance will prolong the life of the machine and ensure trouble free opera-
tion.
5.3.1 Weekly
• Clean the exterior of the machine
• Inspect the machines exterior for obvious signs of damage.
• Check the condition of the welding cable, earth clamp and welding output connectors for damage and
any sign of over-heating
• Check the condition of the mains cable an plug.
5.3.2 Three monthly
As per the weekly schedule, plus:-
• Remove the lid from the machine and remove the build up of dust and debris from inside the machine using,
either, compressed air at low pressure or an industrial type vacuum cleaner.
• Make a thorough visual inspection of the interior of the machine, look particularly for pieces of welding wire,
or stubs of old welding rods that may have got through the cooling air intakes.
• Check the condition of the mains input connector, look for loose terminal block screws and make sure the
sheath of the mains cable is still clamped securely in the combined cable entry/clamp. Make sure the earth
wire is still securely fastened to the earth stud.
• Check the condition of the welding output connectors, look for any signs of discoloration due to overheating,
this is generally caused by poor connection of the welding power leads due to loose connection bolts inside
the set, or poor quality welding connectors on the electrode holder or earth return lead and can be a com-
mon cause of welding set failure.
5.3.3 Annually
As per the three monthly schedule, plus :-
• Have the machines calibration checked, if necessary have the machine re-calibrated by a New-Arc trained
technician.
SECTION 5 — AULT INDING AND MAINTANENCE

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Viper2500s
1
2
3
4
5
6
7
8
9
10
11
17
18
19
12
13
14
15
16
6.1 Component Location
SECTION 6 — PARTS BREAKDOWN

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Viper2500s
29
31
32
30
20
23
27
21
26
22
24
28
25
SECTION 6 — PARTS BREAKDOWN
6.1 Component Location

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Viper2500s
Item no. Description Part No.
3
1 Control knobs (x 4) M00033/A
2 Torch switch socket assembly M90660
3 Torch switch socket assembly M90660
4 Flow-meter M00018
5 Gas outlet 'Quick coupler' M00955
6 Panel mount Dix type sockets (x 2) M00037
7 Rocker switch M70069/A
8 Fuse holder M00273
9 Gas Inlet Stem M00022/A
10 Remote control socket assembly M90064
11 Panel mount Dix type PLUG (x 2) M00036
12 Gas solenoid 48Vdc M90183/A
13 Thermostat 70ºc M00399
14 Snubber resistor M20221
15 Control PCB M90656
16 Plastic feet (x 4) M00096
17 Display PCB M90651
18 PSU PCB M90655A
19 HF PC M90654
20 TIG PCB M90650
21 IGBT PCB M90653
22 IGBT modules (x 3) M60133 IXYS
23 Current transducer M60112
24 Diode modules (x 2) M60121
25 HF Inductor M90688
26 Capacitor (x 2) M40092
27 Secondary inductor M90672
28 Cooling fan M00371
29 De-coupling capacitor assembly M90089
30 De-coupling capacitor M90461
31 Diode modules (x 2) M60121
32 Capacitor bleed resistor M20233
Misc.
Fuse 3.15A, 20mm quick blow (x 2) M00020
Gas hose (internal) per metre M00958
Gas hose (external) per metre M00001
To maintain continued developments of our products we reserve the right to alter specifications as quoted without prior notice
6.2 Viper 2500s Parts List
SECTION 6 — PARTS BREAKDOWN

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Viper2500s

Head Office
6 Wincomblee Road
Walker Riverside
Newcastle upon Tyne
NE6 3P
Tel: [phone]
ax: [phone]
Website: www.newarc.co.uk
e-mail: [email protected]
Aberdeen Office
Unit 23 Kirkhill Place
Kirkhill Industrial Estate, Dyce
Aberdeen
AB21 0GU
Tel: [phone]
ax: [phone]
Guarantee
New-Arc Equipment Ltd warrants that its goods and services are guaranteed to meet the specific
performance under the stated conditions of use. New-Arc cannot be held responsible for general
wear and tear or for failure occurring due to misuse or abuse arising out of circumstances outside
the stated conditions of use. The stated conditions of use are that considered normal industrial prac-
tice and are not exhaustive. Each machine is identified with a unique serial number and accompa-
nied with the guarantee. New-Arc reserve the right to a) Repair. b) Replace. c) Authorise the rea-
sonable cost of repair or replacement at an approved New-Arc service agent. d) Credit for any
purchased equipment (less reasonable depreciation for actual use and condition) at its entire dis-
cretion. This in no way affects your rights as a consumer. The guarantee is enclosed with each ma-
chine.
Waiver
hilst every endeavour is made to ensure the details of this document are correct at the date of
print. New-Arc accepts no liability for correctness in respect of any impending change in legislation
or health and safety requirements. New-Arc also reserve the right to amend the detail of the docu-
ment content without any notification to the consumer. If reference is made to New-Arc while utilis-
ing the document for spare parts purchase or instruction please advise the revision of the document
to ensure correctness of information.