Amada S-2200CA, Operation Manual

Page: 83 / 210

CHAPTER 3: USING PROGRAMMING FUNCTIONS
IS-2200CA/4500CA INVERTER POWER SUPPLY
990-412 3-29
NOTE: Current shutoff function. The current shutoff function shuts off current when the
proper weld penetration is achieved—for example, during fusing—thus preventing excessive
penetration. (Refer to the figure below.)
2ND STAGE
Timing chart for stopping current
DELAY-START SET time
WE1STOP
WE2STOP
WE3STOP
SQD
WE1
SQZ
WE2
HOLD
COOL1
COOL2
WE3
The WE1STOP signal shuts off current immediately when input during the WE1 period,
switching the sequence to
COOL1
. The
WE1STOP
signal shuts off current immediately after
the WE1 starts (the current is supplied for about 1 cycle) when input before the WE1 period,
switching the sequence to COOL1 . The WE1STOP signal will not shut off current if input
during the
WE2
or
WE3
period.
Insu lat ing f i lm beg ins
to me lt as we ld ing current
starts to f low .
The e lectrode moves in an amount
correspond ing to the th ickness o f
me lted f i lm (d isp lacement ) .
E lec-
trode
Workp iece
(covered w ith
insu lat ion f i lm )
D isp lacement
E lec-
trode
E lec-
trode
E lec-
trode
W ith the Power Supp ly connected
M iyach i we ld checker MM-370A ,
set the d isp lacement in advance .
The current shuto f f funct ion is
act ivated when the d isp lacement
reaches the set va lue .