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12-4
Section
Procedure for Replacing a PCU
310
No.
Remarks
Criteria
Inspection points
Item
3
Installation and
wiring
Is the PCU securely mounted?
There must be no
looseness.
With a Phillips
screwdriver, tighten all
mounting screws.
Are the cable connectors properly
inserted and locked?
Carefully insert and lock
all cable connectors.
Are there any loose screws in the
external wiring?
With a Phillips
screwdriver, tighten all
screws in the external
wiring.
Are any external cables disconnected? There must be no
external abnormalities.
Do a visual check and
connect or replace
cables as required.
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 inspec-
tion.
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 When PCU Parameters and Operating Data is Set in the 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 PC.
8. Transfer the saved parameters and operating data to the CPU Unit using, for
example, CX-Programmer.
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