Which products are affected?
ECS axis modules as A, S, P and M variant which were produced between 22nd March 2005 and 31st July 2006.
Operating system version ≥ 6.7
What happens?
The operating system monitoring messages OH3 (motor overtemperature) and SD2 (resolver error) are not indicated. In addition, the system is not switched off in case of an error.
When does the problem occur?
The problem always occurs in case of devices which have been delivered within the period mentioned above.
Reason:
The error response in case of OH3 (motor overtemperature) and SD2 (resolver error) errors is set to 'OFF'.
OH3: C0583 = 3
SD2: C0586 = 3
However, the default setting is 'TRIP', i.e. both codes are set to '0'.
In addition, code 2450 (CAN-AUX node address) is set to '2'. However, this setting does not influence the drive performance!
Possible diagnostics?
Read out codes C0583, C0586 and C2450 compare them with the documentation.
Short-term measures/recommendations?
Both codes are to be parameterised to TRIP according to the default setting. Customers who explicitly deactivate these monitoring features take on the responsibility for this themselves, irrespective of the behaviour described before.
As of production number 1568039 (see nameplate) the devices are supplied set to 'TRIP'.
All devices on stock were re-parameterised by the LDS and are ready for supply again.
Evaluation:
If a wire breakage actually occurs at the feedback cable, this can be classified into different cases. The risk of an overspeeding motor does not exist in any of these cases described.
1. Wire breakage in the motor temperature feedback cable if the feedback works without problems (resolver and encoder):
This may lead to an overheating of the motor. However, usually further mechanisms will avoid an overheating of the motor (thermal current monitoring [I²xt]).
In many cases the thermal overload (Ixt) of the drive controllers will be activated since this time constant is smaller than the thermal current monitoring of the motor.
2. Wire breakage in the resolver feedback cable or there is no cable connected
This case influences the drive performance. Regarding this, a distinction must be made between synchronous motors (SM) and asynchronous motors (ASM).
a) SM: The motor will maximally execute another rotary motion which corresponds to the pole pitch. In case of a motor with p = 4 this corresponds to a rotary motion of 90 °. The controller outputs the current set under C0022 and generates a corresponding torque. Dependent on the controller setting the motor may oscillate by this position.
In case of phase-controlled applications an implemented following error monitoring and thus the external security chain will be activated.
b) ASM: The motor continues to rotate with slip speed (dependent on the motor type approx. 100 rpm). The controller also outputs the current set under C0022. In case of phase-controlled applications an implemented following error monitoring and thus the external security chain will be activated.
