Foreword and general information
Handling of electric equipment
PC800, 850-8E0
5.
Handling controller
1) The controller contains a microcomputer and
electronic control circuits. These control all of
the electronic circuits on the machine, so be
extremely careful when handling the
controller.
2) Do not place objects on top of the controller.
3) Cover the control connectors with tape or a
vinyl bag. Never touch the connector
contacts with your hand.
4) During rainy weather, do not leave the
controller in a place where it is exposed to
rain.
5) Do not place the controller on oil, water, or
soil, or in a place that can be heated to a high
temperature even for a short time. (Place it
on a suitable dry stand.)
6) Precautions when performing arc welding
When performing arc welding on the
machine body, disconnect all of the wiring
harness connectors connected to the
controller. Fit an arc welding ground to the
place close to the welding point.
6.
Points to remember when troubleshooting
electric circuits
1) Be sure to turn the power OFF before discon-
necting or connecting connectors.
2) Before performing troubleshooting, check all
the related connectors for loose connection.
a
Disconnect and connect the related con-
nectors several times to check.
3) Be sure to connect any disconnected
connectors before going on to the next step.
a
If the power is turned ON with the connec-
tors still disconnected, unnecessary
warning will be displayed.
4) When performing troubleshooting of circuits
(measuring the voltage, resistance, conti-
nuity, or current), wag the related wiring
harnesses and connectors several times and
check that there is no change in the reading
of the tester.
a
If there is any change, there may be de-
fective contact in the circuit.
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