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Replacing Procedures - Mitsubishi Electric MELSEC-A Series User Manual

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8. MAINTENANCE AND INSPECTION
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ MELSEC·A
8.3.2
Replacing procedures
I
(1)
Procedures
(a) Turn off the A2C.
(b) Disconnect the battery lead connector from the connector on the
A2C board.
(c) Remove the battery from the battery holder by pressing down the
holder lug.
(d) Insert a new battery.
(e) Connect the battery lead connector with the battery connector on
the A2C board.
(I) Turn on the A2C.
(g) Check that the low battery flag (M9006) is reset. If it is set, replace
the battery again.
(2)
Caution
Replace the battery within the guaranteed period specified in Table 8.4.
If it takes longer than the guaranteed period, sequence programs or
latched data would be lost.
Table 8.4 Capacitor Backup Time
Capacitor backUp time (mInute)
Guaranteed period (MINIMUM)
Under normal operating conditions (TYP)
9
20
A2CCPU
A2CCPUP21/R21
Red lead
Battery lead connector
Battery
~E~~~~
Blue lead
Board connector
8-4

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