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6 INSPECTION AND MAINTENANCE
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 turns on, the contents of the data (Refer to Section 6.5) in the 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 of Motion CPU area 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 battery life even without a connection to the
Motion controller. The battery should be replaced approximately every 4 to 5
years. In addition, replace the battery with a new one in 4 to 5 years even if the
total power failure time is the guaranteed value or less.
(5) It is recommended to shift to the mode operated by ROM after the programs
and parameters are fixed. The erasing of the programs and parameters can be
avoided even if the battery decrease. (The ROM writing cannot be executed
for the current position of the servo motor in the absolute position system,
home position and latch device. Back up them beforehand using
MT Developer2.)
Refer to Section 4.4 of the "Q173D(S)CPU/Q172D(S)CPU Motion controller
Programming Manual (COMMON)" for details of the ROM operation.
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