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B.
SpotlBurnback
Time
Control
Option (Diagram
7-2)
1.
Optional
Spot/Burnback
Board PC2
provides
control
of
spot
weld
time
and
adjustment
of
burn-
back
time.
2.
Burnback
potentiometer
R26 allows
adjustment
of
the
burnback
time between
0.02
and
0.25
sec-
onds.
3.
Spot
time potentiometer R25 allows
adjustment
of
spot time
from
0.12
to
2.5
seconds
or
0.25
to
5
seconds
depending
on
the
setting
of
Spot
Time
DIP
Switch
Sl.
4.
Spot/Continuous
switch
S51
allows
either a
nor
-
mal
untimed
weld
cycle
or
a timed
spot
weld
cycle.
5.
Spot
time
DIP
switch
51
provides
a selection
of
short
range
(0.12
to
2.5 seconds)
or
long
range
(0.25
to
5
seconds)
spot
time.
Diagram 7-2.
Block
Diagram
For
Spot/Burnback
Time
Control
Option
TM-1571
Page
12
S-21E