Operation; Ground Clamp & Cable; Power On The System; Checking Air Supply Quality - Forney Easy Weld 20 P Manuel D'utilisation

Operation

Ground Clamp Attachment
Connect the GROUND CABLE CLAMP (4) to the workpiece to be cut or to the metallic workbench. Take following
precautions:
• Ensure that the GROUND CLAMP is attached with a good connection to an area of the workpiece that is clean
and free from any coatings such as paint, rust, oil/grease, or scale.
• Make ground connections as close as possible to the cutting area to reduce EMI.
• Do not make a ground connection on the piece which is to be removed.
• The GROUND CLAMP must be attached to the workpiece while cutting.

Power ON the System

Set the POWER SWITCH (2) on the rear of the machine to the ON position. If the input voltage is suitable, the
GREEN LED (5) will turn on.

Checking Air Supply Quality

• To check supplied air quality, activate and deactivate the PLASMA TORCH (9) so there is no active arc but air
flow continues (post-flow). Place a welding filter lens in front of the PLASMA TORCH. Any oil or moisture in the
air will be visible on the lens.
• DO NOT initiate pilot arc while checking air quality.
Performance Data Plate & Duty Cycle
On the machine, there is a plate that includes all the operating specifications for your new unit. The serial number
of the product is also found on this plate.
The duty cycle rating of a plasma cutting machine defines how long the operator can cut and how long the plasma
cutting machine must rest and be cooled. Duty cycle is expressed as a percentage of 10 minutes and represents the
maximum cutting time allowed. The balance of the 10-minute cycle is required for cooling.
For example, a plasma cutting machine has a duty cycle rating of 30% at the rated output of 90A. This means
with that machine, you can cut at 90 A output for three (3) minutes out of 10 with the remaining seven (7) minutes
required for cooling. The duty cycle of your new plasma cutting machine can be found on the data plate affixed to
the machine. It looks like the diagram below. Referring to the sample below, the "X" row lists duty cycle percentages
while the "I2" row lists the amp draw corresponding to the duty cycle. Various duty cycles at other amperages are
listed on your data plate.
20 P

Internal Thermal Protection

If you exceed the duty cycle of the plasma cutting machine, the thermal protection system will engage, shutting OFF
all plasma cutting output. After cooling, the thermal protector will automatically reset and the welding functions can
resume. This is normal and automatic behavior of the machine, and does not require any user action. However, you
should wait at least ten minutes after the thermal protector engages before resuming cutting. You must do this even
if the thermal protector resets itself before the ten minutes is up or you may experience less than specified duty cycle
performance.
16
SER #:
CAN/CSA-E60974-1:12
ANSI/IEC 60974-1 : 2008
X
I
2
U =420V
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2
U =120V
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IP21S
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