Battery Handling; Battery Life And Replacement Guidelines; Reading The Date Of Manufacture; Special "Battery Low-Voltage" Device & Notification Program Example - Mitsubishi Electric MELSEC-F FX3G Series User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
22.4

Battery Handling

When the battery voltage is low, a "ALM" LED lights (red) while the power is ON, and M8005 and M8006 are
switches ON.
Although the battery will continue to function for approximately 1 month after the "ALM" LED switches ON, a
replacement battery should be ordered and installed as soon as possible.

22.4.1 Battery life and replacement guidelines

FX -32BL battery life : Approx. 5 years (ambient temperature : 25 C(77 F))
3U
[Guarantee period: 1 year after delivery or 18 months after
production]
The life of the battery changes with respect to ambient temperature.
When planning for battery replacement, please estimate the battery
life according to the graph to the right and order the replacement
batteries in advance.

22.4.2 Reading the date of manufacture

How to read the battery lot number (reference)
Model name
<Product during December, 2009 or earlier>
9 Z
Month (Example: Dec):
1 to 9 = Jan to Sept,
X = Oct, Y = Nov, Z = Dec
Year (Example: 2009)
Last digit of year
22.4.3 Special "battery low-voltage" device & notification program example
Prepare a system which allows constant external monitoring of the battery status, using an indicator lamp,
etc.
• M8005
M8005
Battery low-voltage
• M8006
Battery low-voltage is latched.
• D8005
Battery voltage can be monitored.
Nameplate
LOT
Y001 Y001 is output when a battery low-voltage condition occurs.
Battery life vs. temperature
Connector
<Product from January, 2010>
1 0 1
Month (Example: Jan):
1 to 9 = Jan to Sept,
X = Oct, Y = Nov, Z = Dec
Year (Example: 2010)
Last two digit of year
22 Battery
22.4 Battery Handling
7
6
5
4
3
2
1
0
0 10 20 30 40 50
Ambient temperature( C)
391
21
22
A
B
C
D
E