14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.4 Maintenance and Periodic Inspection
172
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
14.4 Maintenance and Periodic Inspection
This PLC does not incorporate consumable parts that are factors in the reduction of service life.
However, the output relays (points of contact) and batteries (option) have a limited life expectancy.
14.4.1 Procedures for checking model name
The model name of the main unit can be checked on the nameplate on the right side. After extension devices
are connected, the nameplate cannot be seen. Check the model name in the following places.
14.4.2 Periodic inspection - battery life, etc.
1. Battery
Standard life of FX3U-32BL: 5 years (at ambient temperature of 25 C (77 F))
→ For details on the standard life and recommended replacement frequency, refer to Subsection
22.4.1.
2. Other devices
When inspecting the battery, check the following points.
• Check that the temperature in the panel is not abnormally increased by other heat generating bodies or
direct sunlight.
• Check that dust or conductive dust has not entered the panel.
• Check for loosening of wiring and other abnormalities.
3. Battery Replacement
When the battery voltage drops while the PLC power is on, the "ALM" LED on the panel is lit in red, and
M8005 and M8006 (latch) are turned on.
The memory can be retained for about one month after the lamps turn on. However, the operators may not
immediately find the lamps to be on. Prepare a new battery promptly, and replace the battery with the new
one.
→ For details on the specifications and functions of the battery, refer to 22. Battery
Caution
Select the battery mode using a parameter when using the battery.If the battery mode is not selected, the
data is not backed up, and the "ALM" LED on the panel does not light.
→ For the battery mode setting method, refer to Subsection 22.3.2.
Part Life
Model FX3U-32BL battery Standard life: 5 years (at ambient temperature of 25 C (77 F))
Model name
(abbreviation)
Model name
When the top cover is removed
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