122 Program featuresSafety and protections Fixed/Standard protectionsOvercurrentIf the output current exceeds the internal overcurrent limit, the IGBTs are shut downimmediately to protect the drive.DC overvoltageSee section Overvoltage control on page 119.DC undervoltageSee section Undervoltage control (power loss ride-through) on page 119.Drive temperatureIf the temperature rises high enough, the drive first starts to limit the switchingfrequency and then the current to protect itself. If it is still keeps heating up, forexample because of a fan failure, an overtemperature fault is generated.Short circuitIn case of a short circuit, the IGBTs are shut down immediately to protect the drive. Emergency stopThe emergency stop signal is connected to the input selected by parameter 21.05Emergency stop source. An emergency stop can also be generated through fieldbus(parameter 06.01 Main control word, bits 0…2).The mode of the emergency stop is selected by parameter 21.04 Emergency stopmode. The following modes are available:• Off1: Stop along the standard deceleration ramp defined for the particularreference type in use• Off2: Stop by coasting• Off3: Stop by the emergency stop ramp defined by parameter 23.23 Emergencystop time.• Stop torque.With Off1 or Off3 emergency stop modes, the ramp-down of the motor speed can besupervised by parameters 31.32 Emergency ramp supervision and 31.33 Emergencyramp supervision delay.Notes:• The installer of the equipment is responsible for installing the emergency stopdevices and all additional devices needed for the emergency stop function to fulfill
