1S9STOEN_26-5-17_ADL300_STO_STO Pag. 16/30
5.2 Connections and use of the “SAFE TORQUE OFF” function
The “SAFE TORQUE OFF” function shall be used to prevent unexpected starting from standstill of
the motor. In case motor is running, standstill condition should be achieved with controlled braking,
before “SAFE TORQUE OFF” function being activated.
The safety function breaks off power and current onto the drive outputs and makes motor coast.
The motor has to be taken to standstill by means a dedicated function.
The correct use of “SAFE TORQUE OFF” function has to be made using two safety related
signals and usual START drive commands and sequence:
•
ENABLE
•
SAEFTY ENABLE
In all cases where application/highest SIL level is required feedback system should be used. Two
feedback signals are allowed for system fault detection as described in §4.4 Safety Fault Reaction
System.
Following is a simplified diagram showing all electrical connection necessary for using STO safety
function.
Two set of interface connectors are used onto ADL300 drives.
1. Regulation Enable and Feedback Drive OK
2. Safety Dedicated Connector
Safety system is activated by means of dedicated connections hosted at the bottom of ADL300
case made up of 4 poles input connector hosted on the safety board.
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