Battery Life - Mitsubishi Q170MCPU User Manual

6 INSPECTION AND MAINTENANCE

6.5.1 Battery life

Battery type
Power-on time
(Note-7)
Q6BAT
Q7BAT
(Large-capacity battery)
(Note-7)
(Note-1) : The actual service value indicates the average value, and the guaranteed time indicates the minimum time.
(Note-2) : The power-on time ratio indicates the ratio of Motion controller power-on time to one day (24 hours).
(When the total power-on time is 17 hours and the total power-off time is 7 hours, the power-on time ratio is 70%.)
(Note-3) : The guaranteed value (MIN) ; equivalent to the total power failure time that is calculated based on the characteristics value of the
memory (SRAM) supplied by the manufacturer and under the storage ambient temperature range of -25°C to 75°C (-13 to
167°F) (operating ambient temperature of 0°C to 55°C (32 to 131°F)).
(Note-4) : The guaranteed value (TYP) ; equivalent to the total power failure time that is calculated based on the normal air-conditioned
environment (40°C (104°F)).
(Note-5) : The actual service value (Reference value) ; equivalent to the total power failure time that is calculated based on the measured
value and under the storage ambient temperature of 25°C (77°F). This value is intended for reference only, as it varies with
characteristics of the memory.
(Note-6) : In the following status, the backup time after power OFF is 3 minutes.
• Q6BAT/Q7BAT lead connector is disconnected.
• Lead wire of Q6BAT/Q7BAT is broken.
(Note-7) : Set the battery (Q6BAT/Q7BAT) to battery holder.
The battery life is shown below.
Guaranteed value
(Note-3)
(Note-2)
ratio
(MIN) (75°C (167°F))
0% 13000
30% 18000
50% 21000
70% 24000
100% 43800
0% 39000
30%
50%
43800
70%
100%
POINT
(1) Do not use the battery exceeding its guaranteed life.
(2) When the battery hours (total power failure time) may exceed its guaranteed
value, take the following measure.
• Perform ROM operation to protect a program even if the battery dies at the
Motion controller's power-OFF.
• If SM51 or SM52 turns on, the contents for the data (Refer to Section 6.5) of
RAM built-in Motion controller cannot be guaranteed.
It is recommended to back-up the data periodically.
(3) When the total power failure time exceeds its guaranteed value, and SM51,
SM52, SM58 and SM59 turns on, immediately change the battery. Even if the
alarm has not yet occurred, it is recommended to replace the battery
periodically according to the operating condition
(4) The self-discharge influences the life of battery without the connection to the
Motion controller. The battery should be exchanged approximately every 4 or 5
years. And, exchange the battery with a new one in 4 to 5 years even if a total
power failure time is guaranteed value or less.
Battery life (Total power failure time) [h]
Guaranteed value
(Note-4)
(TYP) (40°C (104°F))
40000
43800
43800
6 - 8
(Note-1)
Actual service value
(Note-5)
Backup time after alarm
(Reference value)
(TYP) (25°C (77°F))
43800
(After SM51/SM52 ON)
90