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3 Safety Function
MITSUBISHI CNC
3.2.1 SLS (Safely Limited Speed) Function
Safely Limited Speed function observes that the motors for servo and spindle do not exceed the specified speed when
the safety door of the machine is open. The setup can be performed without shutting the machine power off and this
contributes to reducing preparation time and improving operation. The speed is redundantly observed by the CPU of the
drive unit and the NC control unit, and an alarm is issued when either one of the CPUs detect the speed command or
speed feedback exceeds the specified speed, which lead to the deceleration control in the motor. The power is shut off
by the STO (Safe Torque Off) function after the motor stops.
(1) Connection
The following three wirings are required for the SLS function.
[1] The state signal for the safety door of the machine is wired to both the NC unit side (DI) and drive unit side
(CN9 connector MPI1). The double-protection for the wiring must be provided by wiring the signal to each of
the NC side and drive unit side as the following figure.
[2] Add the wiring to control the contactor in the NC unit side in order to shut the power when an error occurs.
[3] In addition to the emergency stop wiring for the NC unit, add the external emergency stop wiring for the CN24
connector of the power supply unit.
POINT
In order to set up SLS function, perform the setup in this section and the setup in "3.4 STO (Safe Torque Off) Function"
additionally.
CAUTION
The door state signal input port is also used for other signal input depending on the parameter setting. When the input is
duplicated, consider to wire the door state signal to other drive units connecting to the same NC communication line.
L+
L-
MPI1
[1]
[2]
[3]
(MDS-D2/DH2-CV)(MDS-D2/DH2-SP)(MDS-D2/DH2-V2)(MDS-D2/DH2-V1)
CN24
CN23
Servomotor Spindle motor
Machine safety door
Open/close switch (
Door status signal
sensor
NC unit
Emergency
stop switch
3-phase AC
power supply
Circuit protector
(Note)
Prepared by
user
AC reactor
Contactor
(Note)
Prepared by
user
Breaker
or
fuse
(Note)
Prepared by
user
To 2th and 3th axis
servo
CN9 connector
)