CAUTION
Use the power that are complied with the power specification conditions (input voltage, input
frequency, tolerable instantaneous power failure time) indicated in each specifications manual.
When making detector cables, do not mistake connection. Failure to observe this could result in
malfunction, runaway or fire.
When using NC Card, first power ON the NC Card, and then the base I/O unit. If the base I/O unit is
powered ON first, current flows from the connection cable to the NC Card, resulting in malfunction in
the PC or the cards installed in the PC.
(5) Troubleshooting
CAUTION
Use a motor with electromagnetic brakes or
establish an external brake mechanism for the
purpose of holding; this serves as
countermeasures for possible hazardous
situation caused by power failure or product
fault.
Use a double circuit structure for the
electromagnetic brake’s operation circuit so
that the brakes will activate even when the
external emergency stop signal is issued.
Motor
Electro-
magnetic
brake
Shut off with motor
brake control output
Shut off with CNC brake
control PLC output
MBR
EMG
24VDC
The machine could suddenly restart when the power is restored after an instantaneous power
failure, so stay away from the machine. (Design the machine so that the operator safety can be
ensured even if the machine restarts.)
To secure the absolute position, do not shut off the servo drive unit’s control power supply when its
battery voltage drops (warning 9F) in the servo drive unit side.
If the battery voltage drop warning alarm occurs in the controller side, make sure to back up the
machining programs, tool data and parameters, etc. with the input/output device before replacing the
battery.
Depending on the level of voltage drop, memory loss could have happened. In that case, reload all
the data backed up before the alarm occurrence.
