Mitsubishi Electronics manual 113

10 MAINTENANCE AND INSPECTION

10.3.1 Battery life

(1)CPU module battery (Q6BAT) life

(a) The CPU module battery life is given below.

MELSEC-Q

CPU Module	Energization		Battery life
				After SM51 is energized
	Time Ratio	Guaranteed value	Value in actual use
Type				(Guaranteed time after
	1	(MIN)	(TYP)
				alarm occurrence)
	0%	5433hr	13120hr	120hr
Q02CPU	30%	7761hr	18742hr	120hr
	50%	10866hr	26240hr	120hr
	70%	18110hr	43733hr	120hr
	100%	10years	10years	120hr
	0%	2341hr	6435hr	120hr
Q02HCPU	30%	3344hr	9192hr	120hr
	50%	4682hr	12870hr	120hr
Q06HCPU
	70%	7803hr	21450hr	120hr
	100%	10years	10years	120hr
	0%	1260hr	4228hr	48hr
Q12HCPU	30%	1800hr	6040hr	48hr
	50%	2520hr	8456hr	48hr
Q25HCPU
	70%	4200hr	14093hr	48hr
	100%	10years	10years	48hr

1: The energization time ratio denotes the ratio of power-on time in a day (24 hours). (When power is on for 12 hours and off for 12 hours, the energization time ratio is 50%.)

(b)The Q6BAT life is 10 years when it is used without connecting to the CPU module.

(2)SRAM card battery life

The SRAM card battery life changes depending on the combination of the serial number (first 5 digits) of the CPU module and the manufacturing control number of the memory card.

The SRAM card battery life is indicated below.

(a) CPU module whose serial number's first 5 digits are "04012" or later

			Energization		Battery life
						After SM51 is energized
	SRAM card		Time Ratio	Guaranteed value	Value in actual use
						(Guaranteed time after
			1	(MIN)	(TYP)
						alarm occurrence)
	Q2MEM-1MBS		0%	690hr	6336hr	8hr
	Manufacturing
	control number
	"	A"	100%	11784hr	13872hr	8hr
		2
	Q2MEM-1MBS		0%	2400hr	2.7years	20hr
	Manufacturing		30%	2880hr	3.6years	20hr
	control number		50%	4320hr	4.5years	20hr
	"	B"	70%	6480hr	5.0years	20hr
		2	100%	5.0years	5.0years	50hr
			0%	2400hr	2.7years	20hr
	Q2MEM-2MBS		30%	2880hr	3.6years	20hr
			50%	4320hr	4.5years	20hr
			70%	6480hr	5.0years	20hr
			100%	5.0years	5.0years	50hr
10 - 5						10 - 5