Omron CJ1W-C113 - REV 02-2008, Operation Manual

Page: 372 / 406

345
Handling Precautions Section 12-3
Required Tools The following tools, materials, and equipment are required when performing
an inspection.
Phillips screwdriver
Voltage tester or digital voltage meter
Industrial alcohol and a clean cotton cloth
The following measuring devices may be required when performing an
inspection.
Synchroscope
Pen oscilloscope
Thermometer
Hydrometer
12-3 Handling Precautions
• Turn OFF the power before replacing the PCU.
• If a PCU is found to be faulty and is replaced, check the new PCU again to
ensure there are no errors.
• When returning a faulty PCU for repair, make a detailed record of the
PCU’s malfunction and take it together with the PCU to your nearest
OMRON office or sales representative.
• If a contact is not good, put some industrial alcohol on a clean cotton cloth
and wipe the surface. After doing this, install the PCU.
12-4 Procedure for Replacing a PCU
Use the following procedure when it is necessary to replace a PCU.
12-4-1 PCU Parameters and Operating Data Set in CPU Unit’s DM Area
1,2,3... 1. Make a note of the unit number of the PCU to be replaced.
2. Save the parameters and operating data for the PCU to be replaced to a
floppy disk or a hard disk using, for example, CX-Programmer.
3. Turn OFF the power supply.
4. Make a note of the way in which the PCU is wired. (It is recommended that
the cables are labelled.)
5. Replace the PCU, and reconnect the wiring as before.
6. Set the unit number for the PCU.
7. Turn ON the power supply to the PLC.
8. Transfer the saved parameters and operating data to the CPU Unit using,
for example, CX-Programmer.
9. Turn the PLC power OFF and back ON.
3 Installation and
wiring Is the PCU securely mounted? There must be no loose-
ness. Lock the sliders securely.
Are the cable connectors properly
inserted and locked? Carefully insert and lock
all cable connectors.
Are there any loose screws in the exter-
nal wiring? With a Phillips screw-
driver, tighten all screws
in the external wiring.
Are any external cables disconnected? There must be no exter-
nal abnormalities. Do a visual check and
connect or replace cables
as required.
No. Item Inspection points Criteria Remarks