Safety concept

• The MOVIMOT^® MM..D frequency inverter is characterized by the optional connection of an external safety controller/safety relay. They de-energize all active elements that generate the pulse trains to the power output stage (IGBT) when a connected command device (e.g. emergency stop button with latching function) is activated, by disconnecting the safety-related 24 V supply voltage. This ensures that the frequency inverter does not supply energy to the motor that can generate a torque.
• Disconnecting the 24 V supply voltage ensures that the voltage supplies required for operation of the drive are safely interrupted.
• Instead of galvanic isolation of the drive from the supply system using contactors or switches, the disconnection of the DC 24 V supply described here safely prevents the gating of the power semiconductors in the frequency inverter. The rotary-field generation for the respective motor is deactivated even though the line voltage is still present.