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4.
Operation
~4
i~
To~tc~SensorOperatIon
~
:~, ~: ~~iix~ ~i
1
Input
Power Pilot
Light
Pilot
light
goes
on
when the unit Is
connected
to
a
proper
115
vac
power
supply.
The
Robotic Interface
II sends
a
115
vac
signal
to the
Touch Sensor
to
close
the
contactor
before
welding begins.
The
contactor
remains closed until the
welding
current
drops
below 15 amperes
which is sensed
by
reed switch
CR2. When
no
weld current is
detected,
the
contactor
deenergizes.
2
Touch Sensor Pilot
Light
Pilot
light
goes
on
when 170 vdc is
present
on
voltage
sense
leads.
The
Touch
Sensor
receives
a
signal
from the robot controller
to
begin
the touch
sensing operation.
The
contactor
deenØrgizes
to
prevent
any low
impedance path
through
the
welding
power
source.
The Touch Sensor
provides
170
vdc to the
voltage
sense
leads.
When less than
1.5k ohms of
resistance is
detected,
a
signal
is
sent
to
the
robot
controller
indicating
a
touch
by
the
welding
wire.
5. MainteNance and
Troubleshooting
ST-801 884/SB-lBS
016
Replace damaged
or
unreadable labels.
Clean and
tighten
weld
terminals.
Repair
or
replace
cracked
cables
and
cords.
6 Months
Blow
inside.
out
or
vacuum
1
2
bd
3 Months
12
OM-186 360
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