iWeld 8PMIG205DIG, User Manual

Page: 69 / 80

3-7. Duty cycle & Over heat
Strictly to apply the maximum working time (see technical specifications). If you go beyond this
period, the machine suddenly stop. This is possible due to the internal overload because the ma -
chine overheats. In this case, it is not necessary to turn off the machine, the fan should be working
to reduce the temperature. Usually within 5-10 minutes the machine working again.
I （ A ） 0
100
％
25%
80
X
160
60 ％
The letter “X” stands for duty cycle, which is
defined as the proportion of the time that a
machine can work continuously within a cer
-
tain time (10 minutes). The rated duty cycle
means the proportion of the time that a ma
-
chine can work continuously within 10 minutes
when it outputs the rated welding current.
66
44
20
0 600 I
2
（
A
）
U
2
（ V ）
3-8. Volt-Ampere Characteristic
The POCKETMIG welders have excellent volt-
ampere characteristic, seeing the following
graph.
In MMA welding, the relation between the
rated loading voltage U
2
and welding current
I
2
is as follows:
When I
2
≤600A then U
2
=20+0.04 I
2
(V)
When I
2
>600A thenU
2
=44(V)
The relation between duty-cycle
and welding current
- The machine has the function of 2T/4T under MIG mode.
- 2T mode – press the Menu button for 5s, the function is on and the Main display shows “2T”.
Press the torch switch, the machine starts welding, while release the switch, welding stops.
- 4T mode – Press the Menu button for 5s again, it turns into 4T mode and the Main display
shows “4T”. Press the torch switch for 1st time, it goes into arc initiation current. Release the
switch for 1st time, the machine starts welding. Press the switch for 2nd time, it goes into
crater current. Release the switch for 2nd time, welding stops.
- Adjust Data adjusting knob during welding can realize the synergic manipulation of welding
voltage and feeding speed, which displays in Main display. The adjustable range is 16.9V
3.3m/min to 23.3V 11m/min 17.5V under 100% CO2 mode, 15.5V 3.3m/min to 19.5V 11m/min
under mixed gas mode.
- When perform welding, the display shows the real time welding voltage and current. 5 seconds
later, it returns to the preset welding voltage and wire speed.
- Release the torch switch, it stops welding. The Main display shows “HOLD” for 3 seconds. The
Main display redisplays welding voltage and wire speed.
3-6. Malfunction display of Overheat Protection
The panel displays “-EH” when overheating and flashes continuously, the machine can not work
normally.
When the temperature of the welding machine falls below 65 oC again the overheating mal -
function will disappear and the machine will work normally without restarting.
EN-9