Mitsubishi Electric QD77MS User Manual page 114

(Note-1): When the control power supply of servo amplifier is shut off, it is not possible to communicate with the servo amplifier after that.
Example) When the control power supply L11/L21 of the servo amplifier B in the figure is shut off, it is also not possible to
communicate with the servo amplifier C .
If only a specific servo amplifier main circuit power supply is shut off, be sure to shut off the main circuit power supply
L1/L2/L3, and do not shut off the control power supply L11/L21.
(Note-2): Be sure to shut off the both of main circuit power supply L1/L2/L3 and control power supply L11/L21 after disconnection of
SSCNET communication by the connect/disconnect function of SSCNET communication at the time of exchange of servo
amplifier. At this time, it is not possible to communicate between the servo amplifier and Simple Motion module. Therefore, be
sure to exchange the servo amplifier after stopping the operating of machine beforehand.
(Note-3): The dynamic brake is operated, and servomotor occurs to the free run when EM1 (forced stop) of servo amplifier turn OFF. At the
time, the display shows the servo forced stop warning (E6.1).
During ordinary operation, do not used forced stop signal to alternate stop and run.
The service life of the servo amplifier may be shortened.
Chapter 3 Specifications and Functions
3 - 42