Axle is overloaded (overcurrent)/Motor I2t monitoring
The error is triggered if the current motor current is continuously larger than the motor’s rated current. This monitoring protects the motor from thermal overload. It is based on a thermal motor model. Monitoring is activated via the parameter ID43 'Overload Ax_Mask'. The overload threshold is specified in parameter ID44 'Overload [Ax]'. Parameter ID45 'Number Overload [Ax]' specified how many remaining time cycles the overload threshold has to pass in order for an error message to be triggered. The length of the remaining time cycles is not a fixed period and is highly dependent on the processes currently running in the main processor (DSP). The duration of the remaining time cycles can be read out via the parameter ID8 "remaining time".
The error is triggered if the I2t value ID59 "Monit.Motor I2t value" reaches the limit value entered in parameter ID58 "Mon.M. I2t threshold". The I2t value is a measure of the thermal motor load with respect to the nominal values. The I2t value is initialised by the motor temperature measured via the motor temperature sensor (KTY sensor). The error is signalled to the primary control. If the primary control switches the drive controller off, renewed release of the drive controller is prevented until the cause of the error is corrected and the error acknowledged.
Source and Remedy
All malfunctions, which in some way or other result in the motor temperature value being too high can trigger the error if I2t monitoring has activated (even during deactivated releases). Check the KTY motor temperature sensor, check the connection lead, if the motor is cold check the displayed motor temperature ID1682 "MT temperature" (ambient temperature expected).
A defective KTY sensor can lead to incorrect initialisation of the I2t value. Check the KTY sensor and KTY sensor cable and replace if necessary.
Incorrect parameterisation of the I2t monitoring. Check the parameter ID469 "Nominal field current", ID470 "Nom.Mom.Strom", ID468 "Field current", ID462 "Max.Mom.Current", ID57
"Motor time constants", ID58 "Mon.M. threshold".
The motor is mechanically overloaded. Check mechanical load and reduce if possible. Malfunctions in the motor commutation or in the actual position
acquisition (rotary encoder) can lead to malcommutation. This can cause a sharp rise in power demand.
Carry out BA22 stop angle run and ensure that the drive can freely rotate.
Check actual position acquisition, i.e. (absolute) rotary encoder and parameterisation of the pick-up evaluation, replace rotary encoder if necessary.