Jasic EVOLVE 200 Operator's Manual page 26

OPERATION - MMA
Before starting any welding activity ensure that you have suitable eye protection and
protective clothing as, welding rays, spatter, smoke and high temperatures produced in the
process may cause injury to personnel.
Also take the necessary steps to protect any persons within the welding area that may cause injury too.
To access the below options, you can either rotate the left hand control dial and confirm by pressing the
left control dial OR by pressing the touch screen and sliding your finger to select your choice.
MMA - Manual or Synergic mode icon (C)
When selecting the Manual/Synergic icon, this option offers the
user the following MMA weld mode choice:
•
Manual - Standard MMA controls, set your parameters by
adjusting Current and Arc Force.
•
Synergic - The machine will calculate the optimal MMA
settings based on the selected material thickness and
electrode size.
MMA - Advanced settings menu (D)
Pressing the EXTRA icon will enter the advanced settings menu.
From here you can view additional options as follows:
1. VRD Delay Switch
2. Power Limit On/Off
3. Power Limit (functions only if Power Limit is ON)
4. Anti-sticking On/Off
5. MMA Auto Standby
6. Restore Default Settings
1. VRD Delay Switch:
VRD - (Voltage Reduction Device) is a hazard reducing circuitry inbuilt into
welding power sources that is used in the MMA/Stick welding process.
This reduces the open circuit voltage (OCV) when the output of the power supply
is ON but not welding to a safe voltage of 14.3V.
During welding, VRD is off and when the arc stops, the output voltage changes
from welding voltage to no-load voltage and finally to VRD voltage, the time from no-load voltage to
VRD voltage is called 'VRD delay time' and is around 300ms. With 'VRD OFF' it will prolong the time
from 300ms to 30 seconds. Setting to 'VRD OFF' offers the higher re-ignition voltage if the arc is
interrupted, assisting the operator to re-ignite the arc easier.
2. Power Limit On/Off:
In MMA mode, the output is constant current (CC), so voltage will change but
current will stay constant Power Limit mode, is a version of Constant Power,
keeping the output power more stable, meaning that when voltage increases or
decreases, current will be more constant. Power Limit mode benefits cellulosic
electrode welding when current is between 100amps to 200amps.
3. Power Limit value:
This value can only be adjusted in the power limit has been turned ON is a
proportion of power limit which can be adjusted from 0-100% and is the range
of power limitation, as shown in the image right.
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