Battery Life - Mitsubishi Electric Melsec-Q172DCPU User Manual

6 INSPECTION AND MAINTENANCE

6.5.1 Battery life

Module type
Q173D(S)CPU/
Q172D(S)CPU Battery (Q6BAT)
(Note-7)
Internal
battery
Q172DEX
(A6BAT/
MR-BAT)
(Note-1): The actual service value indicates the average value, and the guaranteed value indicates the minimum value.
(Note-2): The power-on time ratio indicates the ratio of Multiple CPU system 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.
• The battery connector/Q6BAT lead connector is disconnected.
• The battery cable/lead wire of Q6BAT is broken.
(Note-7): Set the battery (Q6BAT) to battery holder unit (Q170DBATC) when using the Q173DCPU(-S1)/Q172DCPU(-S1).
The battery life is shown below.
Power-on
Battery type
time ratio
(Note-2)
0%
30%
50%
70%
100%
0%
30%
Q171ENC-W8/
50%
Q170ENC 1
70%
100%
0%
30%
Q171ENC-W8/
50%
Q170ENC 2
70%
100%
Battery life (Total power failure time) [h]
Guaranteed Guaranteed
(Note-3) (Note-4)
value value
(MIN) (TYP)
(75°C (167°F)) (40°C (104°F))
20000
27000
31000 43800
36000
43800
3000 8000
4000 11000
6000 16000
10000 26000
43800 43800
1500 4000
2000 5500
3000 8000
5000 13000
43800 43800
6 - 8
(Note-1)
Actual service
(Note-5)
value
Backup time
(Reference value) after alarm
(Note-6)
(TYP)
(25°C (77°F))
90
(After
43800
SM51/SM52
ON)
24000
34000
43800
43800
40
43800
(After Error
code 1152
12000
occurrence)
17000
21900
21900
43800