Amada S-2200CA, Operation Manual

Page: 63 / 210

CHAPTER 3: USING PROGRAMMING FUNCTIONS
IS-2200CA/4500CA INVERTER POWER SUPPLY
990-412 3-9
CONTROL METHOD FEATURE APPLICATION CONTROL MECHANISM
Secondary constant-power
control
(PWM effective value control)
Controls so that the power
between electrodes becomes
constant.
Responds to change in work
piece state during welding to
make heat input constant.
Used when you
want to reduce
expulsion in early
welding, shunt
current is occurred
at welding, or make
heat generation
constant. Detects the welding current with toroidal
coil and the voltage between electrodes with
the voltage detecting cable to compare the
power calculated by the measured current
obtained by calculating with each control
frequency and voltage to the set current, and
controls pulse width so that there is no
difference in these values.
Primary constant-current peak
value control
(PWM peak 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.
Compared to the effective
value control, the rise of the
current is fast, but the
effective current changes
depending on how large the
current ripple is.
Used for welding of
coated metal or
dissimilar metal.
Sets the primary current obtained by the set
current and the transformer turn ratio as
current limiter, and controls pulse width so
that the switching is turned off when the
primary current detected by the current
sensor mounted into the power supply has
reached to the current limiter.
Secondary constant-voltage
control
(PWM effective value control)
Controls with the voltage
between electrodes.
Provides welding without
expulsion by making voltage
from the rise constant and
reducing the current.
Used for welding of
high specific
resistance material,
welding of high
contact resistance
work piece such as
cross wire, and
projection welding,
which has resistance
change in early
welding to reduce
expulsion.
Detects the voltage between electrodes with
the voltage detecting cable to compare the
measured current obtained by calculating
with each control frequency to the set
voltage, and controls pulse width so that
there is no difference in these values.
Constant-phase control
(Non-constant current) Welding with the fixed pulse
width. No feedback control.
Used for special
cases such as the
test of welder, and
not used for normal
welding.
Controls switching with the set pulse width.
f. HEAT
Set the welding current for WELD1 , WELD2 , and WELD3 , respectively. When CTRL is
changed, the content to be set also change. Also, the settable range of welding current changes
depending on the current range.
UF (UP SLOPE FIRST)
Sets the initial current value of upslope. The set value is the as HEAT .
DL (DOWN SLOPE LAST)
Sets the final current value of downslope. The set value is the as HEAT .