S7 MMA 110 User manual

Inverter Welding
OWNER’S MANUAL
MODEL:MMA/ARC110/140/160/200/250/300/400(110v/220v)
(POWER MOSFET/IGBT CONTROLIED,DC WELDING POWER SOURCE)

1
PRODUCTS INTRODUCTION
Congratulations for your purchase
ARC is hand inverter welder series which is made by international most advantaged invert
technical.
Inverter arc welding power supply is inverter arc welding machine which is sprung up in 1980s
in international market.50Hz/60Hz frequency is inverted to high frequency(frequency is over
100KHz) by MOSFET/IGBT, then step down voltage and rectificate current.inverter arc welding
power supply generates powerful DC welding current through PWM technical. Because
inverter technical of switch power is uscd, dimensions and weight of welding machine has
reduced substantially and efficiency has increased 30%, stabilizing, reliability, lightness,
save-energy and no electromagnetic noise arc characteristics of welding machine series.
Inverter welding machine is developed that is given praise of revolution of welding field by
specialist.
Arc welding machine has characteristics as following:
1, high quality.
2,stable arc.
3,molten bath is easy to control.
4,No-load voltage is higher.
5,able to be used widely.
6,suitable for job of high-altitude and outdoor and fitment of inside or outside.
7,light weight.
8,simple installing and operation.
Welcome to purchase products of S7 company and make suggestion, we will try our best to
perfect our products and service.
1,Maintenance for one year since the date of purchase.
2,during maintenance, if machine is not damaged artificially, it can be repaired.
3,users do not dismantle or refit of replace electric components by oneself. Or users have to
accept the consequences.

2
DATA AND CHARACTERISTIC
Main Technical Date Diagram
Model
Item
MMA/ARC
110
MMA/AMR
140
MMA/ARC
160
MMA/ARC
200
MMA/ARC
250
MMA/ARC
300
MMA/ARC
400
Power
Voltage(v)
Single
Phase
AC220v/110v
±15%
Single
Phase
AC220v/110v
±15%
Single
Phase
AC220v/110
v±15%
Single
Phase
AC220v/110
v±15%
Three phase
AC380V±15%
AC220V/110V
Three phase
AC380V±15%
AC220V/110V
Three phase
AC380V±15%
AC220V/110V
Rate Input
Current(A)
3.4
20.3
24.3
31.8
14.2
18.2
27.3
No-load
Voltage(v)
56
56
56
62
55
55
67
Output
current
Adjustment
Arrange(A)
20-110
20-140
20-160
20-200
20-250
20-300
20-400
Rate output
Voltage(v)
24.4
25.6
27
28
30
32
36
Duty
Cycle(%)
60
60
60
60
60
60
60
Efficiency
(%)
85
85
85
85
85
85
85
Power
factor
0.93
0.93
0.93
0.93
0.93
0.93
0.93
No-liad
Loss(w)
40
40
40
40
40
40
100
Weight(kg)
5
5
8
8
18
18
30
Dimension
(mm)
290*133*
195
290*133*1
95
371*153*
232
371*153*
232
480*204*
303
480*204*
303
562*303*
467

3
Output Cable Connection
1, Every welding machine has been disposed a pair of mobile plugs another end of pincer
cable is connected to black mobile plug and another grounding cable pincer is connected to
red mobile plug. Furthermore, they must be tightened by spanner. Make sure secindary
cables(holder and grounding cable)are connected to mobile plugs firmly, or mobile plug will
be burned up.
2, After mobile plug is inserted in mobile socket. Make sure they has been tightened reliably.
Or plugs and sockets will be burned up if they are operated long time and current is high. That
is very important.
3, Pay attention electrode of cable. As DC welding machine, it has two connection methods:
positive and regular. Positive connection is that work piece is connected to positive electrode
and holder is connected to negative electrode: negative connection is that work piece is
connected to regular electrode and holder is connected to positive electrode. Choose
connection method according to welding process of work piece. If choose wrong that will
cause unstable are and much spatter and atickong to electobe. If run upon the fault, replace
mobile plugs each other. User does not think welding machine is damaged.
4, If it is too far(50-100m) between work piece and welding machine and secind cables (holder
and grounding cables) is longer, so section of cable must be bigger and adequate to welding in
order to reduce voltage drop of cable.
Power Cable Connection
1,Every welding machine has been disposed once power cable, make sure voltage class is
adequate to once cable according to input voltage of machine. If welding machine of
220v/110v power voltage is connected to AC330v power because of carelessness, that will
cause machine into oner voltage protection situation. Please close power switch and connect
is again. The machine may be operated again after 2-3minutes.
2, Make sure once power is connected to coordinated contact of power or socket reliable and
prevent it from oxidizing.
3, Measure voltage volume if it is in waved arrange by AVO meter.
Check
1, If welding machine is grounded reliably according with demands.
2, All contacts is connected firmly, specially between grounding cable pincer and work piece.
3, Secondary output cable is shortly connected to grounding cable.
4, Make sure secondary output electrode is correct.
5, If circuit protect device is used, leakage current must be max 30A.
6, Spatter of machine can cause fire, so make sure if there are combustibles in welding
environment.

4
EXPLANATION SWITCH
1, Open the power switch, screen will show set current volume and ventilator is beginning to
revolve(RILARC160 has no screen of meter).
2, Adjust knobs of welding current and arc-striking push, make welding function complies with
demands(ARC160HAS no knob of arc-striking drive, drive is increased in proportion.)
3, Generally, welding current is adequate to welding electrode according with as following :
φ2.5:70-100A; φ3.2:110-160A
φ4.0:170-220A: φ5.0:230-280A
4,Knob of arc-striking drive is use to adjust welding function, specially in low current arrange,
that is cooperated with knob of welding current adjustment, they may adjust current of
arc-striking and be out of control of knob of welding current adjustment. So machine can grain
powerful energy and push current can achieve effect that may imitate DC welder revolving.
5, If welding machine has been coordinated remote control device;
1) Make sure the switch position of remote control device before operation. If switch is on
“OFF” position that is out of remote control. Switch is on “ON” position that is using remote
control device.
2) Insert plug of remote control in socket of remote control correctly and tighten firmly in
order to prevent poor contact.
3) If remote control device is not be used, make sure the switch is on “OFF” position, or
welding current will not be adjusted on panel.
4) When machine is being transported, the switch of remote control is not on correct position
by bump cause welding adjustment is out of work. Please pay attention it.
Allowable Duty Cycle
1, Operation complies with duty cycle strictly.
2, Inter-variable components is working if duty cycle is exceeded arrange. That will cause
welding machine stop working suddenly. With this situation, make fan continue working in
order to cool down temperature of inter-machine, after 2-3 minutes machine will be operated
again (change with temperature of environment and ventilation).
NOTES
Operation Environment
1, The machine can perform in environments where conditions arc particularly harsh and with
outside temperature between -10 and +40 degrees centigrade, with a dampness level of max
80%.

5
2, Do not operate machine in sunshine or drippings.
3, Do not operate machine in environment where condition is polluted with more dust or gas
with corrosiveness.
Safety
1, Make sure the working area is adequately ventilated.
Welding machine is light and its structure is compact. The electromagnetic fields.generated by
the high currents. So natural wind is not satisfy in cooling down components,there is
axial-flow fan in Intel-machine in order to force to cool down it.
2, No over-load.
Limited to welding current strictly according to max allowable current of all kinds of duty
cycles. Do not exceed load working in order to prevent from shorting use lifetime of welding
machine even burning up machine.
3, No over-voltage.
Power voltage of welding machine is according to main technical data sheet. With this
situation, automatic compensation circuit of voltage may ensure that welding current will not
exceed to allowable volume. If power voltage is exceeded to allowable volume, that may
damaged to components. Please more careful.
4, There is a grounding screw behind machine and which is marked with ground. Mantle must
be connected reliable by cable which section is 10 square millimeter.
Maintenance and check trouble
1, Remove dust by compressed air regularly, generally if machine is operated in environment
where is polluted with more dust and smoke, welding machine must be remove dust twice
every month.
2, Pressure is adequate to welding machine in order to protect little components.
3, Check the electrify connectors and make sure the connectors arc connected firmly(specially
connectors and inserts). tighten the relaxing connector, if components is oxidized, these oxide
must be get rid of and connect them again.
4, Avoid water and steam enter into inter-machine and check insulation of machine.
5, if the machine will not be use for long time, it must be put in its own packing box and
stored in dry environment.
6, Do not throw and bump machine.

6
Check Fault
Faults
Resolvable Methods
Indicator of power switch is not lit,
fan is not working and there is not
welding output.
1. Make sure power switch is close.
2. Make sure electrify wire net(which is connected
to input cable)is in work.
Power indicator is lit,fan does not
work and there is no welding
output.
1. Maybe be connected wrong to 330v power
cause machine is in protection circuit, connect to
220v power and operate machine again.
2. 220v power is not stabilizing(input cable is too
slender)or input cable is connected to electrify wire
net cause machine is in protection circuit. Increase
the section of input cable and tighten input
connector firmly. Close machine 2-3minutes then
open it again.
3. Open and close power switch in short time
cause protection circuit is working close machine
and open it again after 2-3 minutes.
4. Cables are relaxed between power switch and
power source board,tighten them again.
5. Main circuit 24v relay of power sourer board is
not closed and has damaged check 24v power
source and relay. If relay has damaged, replace it.
Fan is working, welding current is
not stabilizing or out of potential
control, current is sometimes low
and sometimes high.
1. Quality of 1K potential is bad, replace it.
Terminal of output is broken circuit or poor connect.
Fan is working and abnormal
indicator is not lit, there is no
welding output.
1. Check if components is poor connect.
2. Check if connector of output terminal is break
circuit and poor connect.
3. Check voltage between power source board and
MOS/IGBT board (VH-07) is about DC 308v.
(1) check if silicon bridge is broken circuit and cable
of silicon bridge is poor connect.
(2) Some of four electrolysis capacitors(about
470UF/450V) is leaking,replace it.
4. If green indicator is not lit in assistant power of
MOS/IGBT board, please connect with seller or OUR
company and replace it.
If there is some question in control circult, please
connect with seller or OUR company and replace it.
Fan is working and abnormal
indicator is lit, but there is no
welding output.
1. Maybe over-current protection is working,
please close machine and waiting. After abnormal
indicator is not on, open machine.
2. Maybe overheated protection is working, wait
for 2-3 minutes.
3. Maybe inverter circuit is in fault, please pull up
the power plug of main transformer(near VH-07 fan)
which is on MOS/IGBT board then open the
machine again.
(1) If abnormal indicator is still lit, some of
MOS/IGBT board is damaged, check and replace it.
If abnormal indicator is not lit:
a, Maybe transformer of middle board is damaged
measure primary inductance volume and Q volume
of main transformer by inductance bridge.
Primary volume is parallel circuit, L=1.2*2.0Mh,
Q>40
If inductance volume and Q volume is low replace it.
b, Maybe some of secondary rectifier tube of
transformer is broken check and replace rectifier
tube.
4. Maybe feedback circuit is in fault.