Restrictions
WARNING
The safety concept is only suitable for performing mechanical work on driven system/machine components.
If the STO signal is disconnected, the line voltage is still present at the inverter DC link.
- Before working on the electric part of the drive system, disconnect it from the supply system using an appropriate external disconnecting device and secure it against unintentional reconnection to the voltage supply.
- The STO function does not prevent an unintended restart. As soon as the STO inputs receive the corresponding signal, the drive can restart automatically. The STO function must not be used for maintenance and repair work.
- The STO function does not have a motor brake. A possible coasting down of the motor may not result in a further hazard. This must be taken into account in a risk assessment of the system/machine. Additional safety measures might have to be implemented (e.g. safety brake system).
- The inverter cannot be used alone without an additional brake system for application-specific safety functions that require active deceleration (braking) of the dangerous movement!
- When using a permanent-field motor and a multiple output stage error occurs – which is extremely rare –, the rotor could rotate by 180°/p (p = number of pole pairs).
INFORMATION
