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4.3 Power up the system
After setting up everything using the DIP switches, power
up the system for proceeding in the setup.
Enter to the setup menu in the control panel to configure
the power source.
4.4 Configure welding cable
compensation
Adjust the
CAL
parameter in the setup menu to set the
welding cable compensation. Set the cable compensation
for voltage losses in the welding cables.
4.5 Configure robot scaling value
The A3 MIG Welder supports value scaling between the
welding system and the robot for wire feed speed, welding
voltage, fine tuning, and welding current. This scaling is
required when the value range of the robot is limited, or
the robot cannot otherwise directly handle the values
provided by the welding system.
The following digital robot interface functions can be
scaled:
•
WireFeedSpeed
control function
•
Voltage
control function
•
FineTuning
control function
•
WeldingVoltage
status function
•
WeldingCurrent
status function
For more information on these functions, see
"Digital robot
interface".
Adjust the
sca
parameter in the setup menu to set the
scaling value. Set the value 0 to turn the scaling off.
Scaling formula
The scaling uses the formula
ScaleValue × Value
Value
=
TARGET
where
is the maximum value and
Value
MAX
setup value.
The actual result of the setup value can be calculated by
using an inverted formula:
Value
=
SOURCE
The division is performed in the digital robot interface
by using integers multiplied by 10. This results in accuracy of
one decimal digit, thus the calculation loses less significant
digits and produces final values which may not exactly
match with the target values.
Chapter 5,
© Kemppi Oy 2020
SOURCE
Value
MAX
is the
Value
SOURCE
Value
× Value
MAX
TARGET
ScaleValue
11
A3 MIG Welder
Example
By means of its specification one robot uses the value
range 0-1023 for adjusting the welding voltage. The
voltage range in the welding system is 10.0-48.0 V. The
operator of the robot wants to use robot's full value range
to achieve the best accuracy of the voltage control, thus
the voltage scaling value should be configured to be the
maximum value of the robot's range (1023).
When the operator wants to use the welding voltage of
25 V, the robot control value is calculated thus:
ScaleValue × Value
SOURCE
Value
=
TARGET
Value
MAX
1023 × 25.0
=
≈ 532
48.0
The actual voltage can be calculated by using the inverted
formula:
Value
× Value
MAX
TARGET
Value
=
SOURCE
ScaleValue
48.0 × 532
=
≈ 24.962
1023
Conclusion: The operator uses the control value 532 to
achieve the welding voltage of 25 V. The actual welding
voltage achieved by using this value is 24.9 V (the less
significant digits are lost).
R01
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