Replacing The Battery - Mitsubishi Electric A173UHCPU User Manual

5. INSPECTION AND MAINTENANCE

5.3.1 Replacing the Battery

Battery Life
Synchronous
Encoder Used/Not Used
Not used
Used (1 module)
(1) Replacing the CPU module battery
M9006 or M9007 turns ON if the voltage drops from the A6BAT battery which backs
up programs and provides memory back-up functions. Program and memory
contents are not lost immediately when these special relays turn ON, but memory
contents may be lost if this special realy status is overlooked.
After M9006 or M9007 turns ON, replace the battery within the total power-
interruption time shown in Table 5.4 below.
This section gives replacement guidelines and describes the replacement method.
(a) Battery life
An alarm occurs and the error message "BATTERY ERROR" is displayed when
the battery life has almost expired.
Replace the battery when this alarm occurs. The battery life is approximately 1
year under normal operating conditions at an ambient temperature of 25
The battery life is shown in Table 5.4.
Table 5.4 Battery Life
Battery Life (Total Power-Interruption Time) (Hr)
Guaranteed Time
(minimum)
5400
3800
*The "actual time" is the average value. The "guaranteed time" is the minimum value.
Preventative Maintenance Guidelines
1) Replace battery every year, even if total power-interruption time is less than the value in
the table.
2) Replace the battery if the total power-interruption time exceeds the guaranteed time
shown in the table and M9006 is ON.
Actual Time
(typical)
13000
9500
5 − 5
C .
After M9006,
M9007 Turns ON
168
168