Integrated safety technology
Drives MP 060…200 PN are also optionally available with integrated safety technology. All drive functions continue to be controlled via the Profinet interface. In addition, the STO (safe torque off) or SS1 (safe stop 1) function can be triggered via a safe digital input.
STO (safe torque off)
In response to a specific trigger or a safety-relevant error, the drive is disconnected from the power, so that no further torque is generated and the motor coasts to a stop if necessary.
Safe digital input
Two channels are used, in order to also ensure safe control of the safety function. The correct signals must be present in order for the drive to turn: e.g. two 24 volt signals, depending on the configuration. If one of the two signals fails, this is immediately recognized as a safety-relevant error.
A second possibility is to define the signals nonequivalently: one 24 volt signal and one 0 volt signal. This has the advantage that a possible short-circuit between the signals is also recognized as a safety-relevant error.
Two digital signals are available for confirmation. These indicate whether a safety-relevant error is present and whether the drive is in a safe (powerless) state.
SS1 (safe stop 1)
In response to a specific trigger or a safety-relevant error, a safety timer starts. When this has run down the drive is disconnected from the power, so that no further torque is generated and the motor coasts down if necessary. While the safety timer is running down, the drive can be controlled normally and can e.g. be braked in a controlled manner.
The different configuration options are defined according to the customer‘s requirements and set in the factory. This guarantees that the safety function is correctly configured in the system and saves the user the need for onerous setting procedures and separate configuration programs.
Different selection options include:
- STO or SS1
- The desired SS1 time
- With or without short-circuit monitoring