Outline Of Safety Observation Function - Mitsubishi Electric MR-D30 Instruction Manual

1. FUNCTIONS AND CONFIGURATION

1.2 Outline of safety observation function

The following functions can be used by MR-D30 functional safety unit.
(1) STO (Safe torque off)
Shuts off servo motor drive energy electronically with 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.
(2) SS1 (Safe stop 1)
Starts deceleration based on an input signal from an external device (EM2). After a specified time for the
check of stop, the STO function will be activated (SS1). This corresponds to stop category 1 of IEC/EN
60204-1.
(3) SS2 (Safe stop 2)
Starts deceleration based on an input signal from an external device (EM2). After a specified time for the
check of stop, the SOS function will be activated (SS2). This corresponds to stop category 2 of IEC/EN
60204-1.
(4) SOS (Safe operating stop)
Monitors whether the servo motor stops within the prescribed range for the stop position. The power is
supplied to the servo motor.
(5) SLS (Safely-limited speed)
Observes whether the speed is within a regulated speed limit value. When the speed is over a specified
speed, energy will be shut off by STO.
(6) SSM (Safe speed monitor)
Outputs a signal when the servo motor speed is within a regulated speed.
(7) SBC (Safe brake control)
Outputs a signal for an external brake control.
(8) Status monitor (SM: Status monitor)
Outputs a signal for the safety observation function status. This is an original function of the functional
safety unit, not the one defined in IEC/EN 61800-5-2.
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