Amada S-2200CA, Operation Manual

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CHAPTER 3: USING PROGRAMMING FUNCTIONS
IS-2200CA/4500CA INVERTER POWER SUPPLY
3-8 990-412
d. WELD ON/OFF
One of the settings required to turn the READY lamp of the Power Supply ON.
NOTE: Even if this switch is ON, the Power Supply cannot supply welding current if the
WELD ON/OFF key on the front panel or external WELD ON/OFF signal is OFF. In order for
the Power Supply to supply welding current, this switch, the WELD ON/OFF key, and the
external WELD ON/OFF signal must all be ON.
e. CTRL
Select one from the following six welding current control methods for
WE1 , WE2
and
WE3 ,
respectively. Press
+ON/-OFF
key to switch the setting. The initial setting is the secondary
constant-current effective value control ( SCD ).
Display Control method
PRI Primary constant-current effective value control
SCD Secondary constant-current effective value control
PWR Secondary constant-power effective value control
PLM Primary constant-current peak value control
VLT Secondary constant-voltage effective value control
FPL Constant-phase control
(Note) Control method of the inverter-type welding power supply
CONTROL METHOD FEATURE APPLICATION CONTROL MECHANISM
Primary constant-current
control
(PWM effective value control)
Requires no connection of
toroidal coil on the secondary
side of the transformer.
Requires turn ratio setting of
the inverter-type transformer.
The loss inside the
transformer is not considered.
Used for welding in
a robot or an
environment where
the weld head
moves and that
causes
disconnection of
toroidal coil and
cable.
Detects the primary current by the current
sensor mounted into the power supply to
compare the measured current obtained by
calculating with each control frequency to
the primary current obtained by “set current
÷ turn ratio”, and controls pulse width so
that there is no difference in these values.
Secondary constant-current
control
(PWM effective value control)
Compared to the primary
constant-current control, the
current accuracy is high since
the welding is directly
controlled, being detecting the
welding current.
Commonly used for
general welding.
Detects the welding current with toroidal
coil to compare the measured current
obtained by calculating with each control
frequency to the set current, and controls
pulse width so that there is no difference in
these values.