User`s manual

8-10
[2] Battery replacement
(1) Battery life and replacement timing
The maximum effective period of the battery is five years.
Please note that the battery life may vary with the ratio of time being charged and discharged.
Charge time ratio = Total charging time / (total charging time + total of non-charging time)
For details about the amount of time that the memory will be backed up, see the table below.
(2) Low battery voltage detection and replacement
If the battery voltage drops enough to indicate it is at the end of its life span, the control module
detects the drop in the battery voltage and lights the red error indicator (FLT). (When the control
module is in the operation mode, it will continue the operation. During this time, the stop output
relay is held closed.)
In addition, special relay 007372 turns ON and the control module stores error code 22(H) in system
memory #0160. Output this special relay status externally and use it to detect errors in the control
module.
Even if special relay 007372 is turned ON, the battery will still maintain the data for the specified
time. However, we recommend replacing the battery as soon as possible.
Even if the control module does not detect a low battery voltage, we recommend replacing the
memory backup battery periodically, according to the conditions in which you are using the unit.
Charge time ratio
Warranty period
(stored at 70 °C)
Actual expected use
(stored at 25 °C)
Warranty period when
a battery error occurs
0%
30%
50%
70%
100%
(0 hours charging/ day)
(7.2 hours charging/ day)
(12 hours charging/ day)
(16.8 hours charging/ day)
(24 hours charging/ day)
0.285 years
0.405 years
0.570 years
0.950 years
5 years
(104 days)
(148 days)
(208 days)
(347 days)
0.759 years
1.085 years
1.518 years
2.536 years
5 years
(277 days)
(369 days)
(554 days)
(925 days)
5 days
5 days
5 days
5 days
5 days