Limitations

  • The brake controller integrated in MOVIMOT® and the standard brake integrated in brakemotors is not safety-related and therefore not part of the safety functions mentioned above. If the brake controller and/or the motor brake fails, the drive can coast for much longer depending on the application (i.e. the friction and inertia of the system). For regenerative load conditions (e.g. lifting axes, transport track with incline), the drive can even accelerate. This must be taken into account in the risk analysis of the system/machine. If necessary, additional safety measures will have to be implemented (e.g. safety brake system).
    • The MOVIMOT® drive must not be used without an additional brake system for application-specific safety functions that require active deceleration (braking) of the dangerous movement.
  • When using the SS1-t function as described above, the brake ramp of the drive is not monitored with respect to safety. In the case of an error, the drive might not be decelerated during the delay time, or it might even be accelerated in the worst case. In this case, the safety-related disconnection via the STO function is only activated after the set time delay has elapsed (see above). You must take the resulting danger into account in the risk analysis of the system/machine and you must implement additional safety measures, if necessary.
  • The system/machine manufacturer must perform a system/machine-specific risk analysis. The use of the drive system with MOVIMOT® must be taken into account.
  • The safety concept is suitable only for performing mechanical work on driven system/machine components.
  • When using the thermistor protection, the protection against restart is not guaranteed when the thermistor protection is triggered. This must be taken into account for a risk analysis and secured by suitable measures if required.
  • If the 24 V supply voltage is disconnected, the line voltage is still present at the frequency inverter DC link.
  • If work is carried out on the electrical section of the drive system, you have to disconnect the supply voltage using an external maintenance switch.

Schematic diagram "Safety concept for MOVIMOT®"

[1]

RS485

[2]

Binary inputs "R", "L", "f1/f2"

[3]

Safety relay external

[4]

Safety-related 24 V voltage supply

[5]

Motor phase