Mitsubishi MOTION CONTROLLERS Q172DCPU Manuel d'utilisateur télécharger pdf (Page 150)

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6 INSPECTION AND MAINTENANCE

6.5 External Battery

The battery installed in the Motion CPU module is used for data retention during the

power failure of the program memory and latch device. Special relays SM51 or SM58

turn on due to the decrease of 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 by power supply on again or reset.

(2) After SM51 or SM52 turns on, replace the battery quickly.

• SM51 turns on at the battery voltage 2.5V or less.

• SM58 turns on at the battery voltage 2.7V or less.

(3) If SM51 turns on, the details of the programs, parameters and absolute

position data cannot be guaranteed.

It is recommended to back-up the battery periodically.

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Mitsubishi MOTION CONTROLLERS Q172DCPU Manuel d'utilisateur Page 150