CHAPTER 3: USING PROGRAMMING FUNCTIONS
IS-300CA INVERTER POWER SUPPLY
990-418 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 la t ing f i lmbegins
to me l t as we ld ing cu r ren t
starts to f low .
Theelectrodemoves inanamoun t
co r respond ing to the th ickness o f
me l ted f i lm(displacemen t ) .
Elec-
trode
Wo rkp iece
(cove red w i th
insu la t ion f i lm)
Displacemen t
Elec-
trode
E lec-
trode
Elec-
trode
W i th the Powe r Supp ly connec ted
M iyach i we ld checke r MM-370A ,
se t the d isp lacemen t in advance .
The current shutoff funct ion is
ac t iva ted when the d isp lacemen t
reaches the se t va lue .
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