Sto Function - Mitsubishi Electric MR-D30 Instruction Manual

4. SAFETY OBSERVATION FUNCTION
4.5 Safety observation function

4.5.1 STO function

(1) Summary
This function electronically shuts off power to the servo motor based on an input signal from an external
device (secondary-side output shut-off). This corresponds to stop category 0 of IEC/EN 60204-1. The
STO function is also used for an emergency stop when an error is detected in an internal diagnosis. Use
the STO function while the servo motor stops.
(2) Operation sequence
(a) STOC (STO command)
Turn off STOC (STO command) only when the servo motor stops after servo off. The STO function
will operate when STOC (STO command) is turned off. While STO is in operation, the power to the
servo motor is shut off and the dynamic brake activates. Turning STOC (STO command) back to on
will return to normal operation.
Servo motor speed
SON (Servo-on)
or
servo-on command
STOC (STO command)
WNG (Warning)
Base circuit (Energy
supply to the servo
motor)
STOS (STO output)
4 - 28
Ordinary operation
50 r/min
0 r/min
ON
OFF
ON (disabled)
OFF (enabled)
ON (alarm)
OFF (no alarm)
ON
OFF
ON
OFF (shut-off)
STO status Ordinary operation