Unit Replacement Precautions; Required Tools - Omron NJ501-1400 User Manual

No. Item
4 Installation and Check that each Unit is con-
wiring nected and locked to the
next Unit securely.
Check that cable connectors
are fully inserted and locked.
Check for loose screws in
external wiring.
Check crimp connectors in
external wiring.
Check for damaged external
wiring cables.
5 User-serviceable Check whether the battery
parts has reached its service life.
CJ1W-BAT01
Tools Required for Inspections
 Required Tools
• Slotted and Phillips-head screwdrivers
• Voltage tester or digital voltmeter
• Industrial alcohol and clean cotton cloth
 Tools Required Occasionally
• Oscilloscope
• Thermometer and hygrometer (humidity meter)
6-1-2

Unit Replacement Precautions

Check the following after replacing any faulty Unit.
• Do not replace a Unit until the power is turned OFF.
• Check the new Unit to make sure that there are no errors.
• If you return a faulty Unit for repair, describe the problem in as much detail as possible, enclose this
description with the Unit, and return the Unit to your OMRON representative.
• For poor contact, take a clean cotton cloth, soak the cloth in industrial alcohol, and carefully wipe the
contacts clean. Be sure to remove any lint prior to remounting the Unit.
Precautions for Correct Use Precautions for Correct Use
• If you replaced the CPU Unit, transfer the user program and the variables with a Retain attri-
bute (i.e., variables retained during power interruptions) that are required at startup, before
you start operation. Unexpected accidents may occur depending on the relation between the
user program and the status of variables retained during power interruptions.
• Routing tables, network parameters, and CPU Bus Unit system settings are stored in the CPU
Unit. Be sure to reload this data if you replace the CPU Unit.
• If you replace a slave or Unit, refer to operation manual for the slave or Unit for information on
the data required for individual slaves or Units and redo the necessary settings.
NJ-series CPU Unit Hardware User's Manual (W500)
Inspection
No looseness
No looseness
No looseness
Adequate spacing between
connectors
No visible damage
Service life expectancy is 5
years at 25C.
(From 0.75 to 5 years
depending on model, and
ambient temperature.)
6 Inspection and Maintenance
Criteria
Press the connectors together
completely and lock them with the
sliders.
Correct any improperly installed
connectors.
Tighten loose screws with a Phil-
lips-head screwdriver.
Check visually and adjust if neces-
sary.
Check visually and replace cables
if necessary.
Replace the battery when its ser-
vice life has passed even if a bat-
tery error has not occurred.
(Battery life depends upon the
model, and ambient conditions.)
Action
6
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