Battery - Mitsubishi Electric MR-MQ100 User Manual

6 INSPECTION AND MAINTENANCE

6.5 Battery

The battery installed in the Motion controller is used for data retention of the program
memory and latch device during a power failure.
Special relays SM51, SM52, SM58, or SM59 turn on due to a decrease in battery
voltage. Even if the special relays turn on, the program and retained data are not
erased immediately.
However, if these relays are overlooked, the contents may be erased.
After relay SM51 or SM58 turns on, replace the battery quickly within the data
retention time for power failure (3 minutes).
POINT
(1) SM51 or SM58 turns on when the battery voltage falls below the specified
value, and remains ON even after the voltage is recovered to the normal
value. SM51 or SM58 turns off after a power supply cycle or reset.
(2) After SM51 or SM58 turns on, replace the battery immediately.
• SM51 or SM52 turns on if the battery voltage becomes 2.5V or less.
• SM58 or SM59 turns on if the battery voltage becomes 2.7V or less.
(3) If SM51 turns on, the details of the programs, parameters and absolute position
and latch data cannot be guaranteed.
It is recommended to back-up the battery periodically.
(4) The data stored in the SRAM built-in Motion controller are shown below.
Programs, Parameters, Motion devices (#), Devices of latch range,
and Absolute position data
6 - 7