Handling Precautions; Procedure For Replacing A Pcu - Omron CJ1W-NC271 - 12-2009 Operation Manual

Handling Precautions

13-3 Handling Precautions

13-4 Procedure for Replacing a PCU

13-4-1 Procedure for Replacing a PCU
1,2,3...
Required Inspection Tools
The following tools, materials, and equipment are required for performing
inspections.
• Voltage tester or digital voltage meter
• Industrial alcohol and a clean cotton cloth
The following measuring devices may be required when performing an
inspection.
• Oscilloscope
• Memory recorder
• Thermometer
• Hygrometer
• Turn OFF the power before replacing the PCU.
• If a PCU is found to be faulty and is replaced, also check the new PCU to
make sure that 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 faulty, clean the contact by applying some industrial alcohol
to a clean cotton cloth and wiping the surface, and then install the PCU.
Use the following procedure when it is necessary to replace a PCU due to
malfunction or other cause. The method for backing up data saved in the
PCU's internal flash memory is also provided here.
Use the following procedure to replace a PCU.
1. Make a note of the unit number of the PCU to be replaced.
2. Use the READ DATA Bit to read the parameters saved in the PCU to be
replaced to the PLC's DM Area first. Then save the DM Area data to a flop-
py disk or hard disk using, for example, CX-Programmer. Alternatively, use
the CPU Unit's simple backup function or the PCU's backup function to
back up (write) the PCU parameter data to the Memory Card installed in
the CPU Unit.
3. Turn OFF the power to the CPU Unit.
4. Disconnect the MECHATROLINK-II communications cables that are con-
nected to the Servo Drive.
5. Replace the PCU and reconnect the MECHATROLINK-II communications
cables, making sure that they are securely locked.
6. Set the unit number for the PCU.
7. Turn ON the power supply to the CPU Unit.
Section 13-3
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