Diagnosis bits

The diagnostic bits are located in the process data object "STM Inputs Device".

Diagnosis bits 1:

The diagnostic bits indicate warning and error messages.

Warning messages ("warning") are temporary.
A warning message indicates that a measured value lies outside of the nominal range. A warning message is canceled when the measured value is within the nominal range again.
Error messages ("error") are persistent.
If an error occurs, the affected motor channels are disabled until you acknowledge the error. See chapter Acknowledging errors.

There are two different scopes for diagnostic bits:

Module errors and module warnings concern the entire box.
Channel-related errors and warnings concern only one motor channel.

The diagnostic bits are subdivided according to these two categories below.

Modul errors and module warnings

If a module error occurs, both motor channels are disabled. Both channels are enabled again when the module error has been correctly acknowledged. See chapter Acknowledging errors.

Bit name	Meaning	Possible reasons	Possible solutions
Device undervoltage	The supply voltage U_P is lower than the threshold value of the undervoltage detection.		Make sure that U_P lies within the nominal voltage range. Check the measured value of the voltage U_P in the CoE parameter F900:05_hex "Motor supply voltage".
Device overvoltage	The supply voltage U_P is higher than the threshold value of the overvoltage detection.
Overtemperature warning	The internal temperature lies above the warning threshold: Parameter F80F:04 Factory setting: 80 °C.	• The ambient temperature is too high. • The connected motor does not meet the specifications	Operate the device only within the specifications.
Overtemperature error	The internal temperature has exceeded the error threshold: Parameter F80F:05 Factory setting: 100 °C.		Operate the device only within the specifications.
General hardware error	The device is not able to initialize successfully.	The device is defective.	None.

Channel-related errors and warnings

If a channel-related error occurs, only the motor channel on which the error occurred is disabled.

Bit name	Meaning	Possible reasons	Possible solutions
Channel n openload	Wire break	• A motor phase is not connected correctly. • A motor phase has burnt out. • Faulty triggering of wire break detection: The motor shaft was moved by an external torque when the motor was at standstill. ¹⁾(for enabled=1 and velocity=0)	• Check the motor connection. • Replace the motor if it is defective.
Channel n short circuit	At least one phase current has exceeded the value of the parameter "Maximal current": see CoE index 80n00:01. The motor channel has been disabled.	• A motor phase is short-circuited. • The motor is defective.	• Check the motor connection. • Replace the motor if it is defective.
Channel n motor overload I2T warning	The calculated I²T value currently exceeds the warning threshold: CoE index 80n0:16. Default: 80 %.	If the warning occurs during the ramp-up phase: The output current is too high.	Decrease the parameter “Sensorless offset scaling”: CoE index 80n3:14.
Channel n motor overload I2T warning		If the warning occurs during continuous operation: Mechanical overload.	Reduce the load.
Channel n motor overload I2T error	The calculated I²T value has exceeded the error threshold: CoE index 80n0:18. Default: 110 %.	If the error occurs during the ramp-up phase: The output current is too high.	Decrease the parameter “Sensorless offset scaling”: CoE index 80n3:14.
Channel n motor overload I2T error		If the error occurs during continuous operation: Mechanical overload.	Reduce the load.
Channel n amplifier overload I2T warning	The calculated I2T value of the amplifier currently exceeds the warning threshold:	Incorrect parameter setting: The thermal limit of motors that meet the specifications is usually much lower than the thermal limit of the amplifier.	Check the motor parameters: CoE index 80n0.
Channel n amplifier overload I2T error	The calculated I²T value has exceeded the error threshold:		Check the motor parameters: CoE index 80n0.
Channel n in limit	The current is currently being limited because the I²T value of the motor exceeds 97 %.	Mechanical overload	You can disable this protective function by setting the parameter 80n3:03 to TRUE.
Channel n commutation error	The commutation algorithm has determined that the rotary field and the rotor are not running synchronously. Hint: You can have "commutation errors" acknowledged automatically. See chapter Autoacknowledge: acknowledge errors automatically.	If this bit is set during the ramp-up phase: Mechanical overload ²⁾ The output current is too low. The parameter "ramp-up velocity" is too high.	Check the motor load. Increase the value of the "Sensorless offset scaling" parameter: CoE index 80n3:14. Reduce the value of the "Rampup velocity" parameter: CoE index 80n3:19
Channel n commutation error		If this bit is set in continuous operation: The velocity (output variable "Velocity") is too low.	Try again at a higher velocity. Increase the value of the parameter "Start velocity" (CoE-Index 80n0:09) to ensure that the motor does not start with too low velocity preset.

¹⁾ This happens, for example, when a package is conveyed from the previous zone and the package rotates the non-driven conveyor roller due to its forward movement.

²⁾ Especially likely when the motor makes a noise with increasing pitch.