13-2 Maintenance Procedures; Replacing The Safety Cpu Unit - Omron NX-SL3300 User Manual

13-2 Maintenance Procedures

If the inspection reveals any problems that require you to replace a Safety Control Unit, observe the
following precautions.
• Never disassemble, repair, or modify a Safety Control Unit. This will compromise the integrity of the
safety function and is dangerous.
• Make sure that you can replace the Unit under safe conditions.
• Perform all replacements with the power supply turned OFF to prevent electric shock, or unexpected
movement of the machinery.
• Check the new Unit to make sure that there are no errors.
Precautions for Safe Use
After you replace the Unit, reset the program and all configuration settings that are necessary to
resume operation. Make sure that the safety functions operate normally before you start actual
operation.
Remove the faulty Unit, and then replace and wire the new Unit.
Refer to 2-1-2 Part Names and Functions on page 2 - 8and to Section 3 Installation and Wiring on
page 3 - 1 for information on installing, removing, and wiring Units.
The following section introduces how to replace Safety CPU Unit and Safety I/O Units.
Precautions for Correct Use
The backup/restore functions of the NJ/NX-series CPU Unit do not apply to Safety Control Unit.
Use the Sysmac Studio when you replace a Unit.
13-2-1

Replacing the Safety CPU Unit

Precautions before Replacing the Unit
• Before replacing the Unit, make sure there is a Sysmac Studio project file that corresponds to the
current safety control system. Alternatively, you can upload the project file from the actual safety
control system.
• Make sure that the Sysmac Studio project file is the intended file before replacing the Unit.
• Replacement work must be performed only by personnel with knowledge of safety controls.
• To ensure the safety of all workers, turn OFF the power supply to all hazard sources (i.e., actuators,
etc.). Alternatively, place the NJ/NX-series CPU Unit in PROGRAM mode.
Replacement Procedure
Remove the Safety CPU Unit to replace and attach the new Safety CPU Unit.
NX-series Safety Control Unit User's Manual (Z930)
13 Inspection and Maintenance
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