------------Fast Lane Information----------
Eliminated from:
8400 TopLine: FW version = 13.00.00.00
Response of the new version?
The dead time compensation has been corrected.
Which products are affected?
8400 TopLine: FW version ≤ 13.00.00.00
What is the response?
With increasing speed, the control of synchronous motors becomes more unstable. At high speeds, possibly a rising signal in the current controller can be observed. By this, the OC1 monitoring function is activated.
When does the problem occur?
The response occurs with synchronous motors with a speed feedback, which are actuated in the servo control SM motor control type (C006=1). The rotor position in the BaseUnit BU motor control is generated from the current encoder position from the ControlUnit CU and a dead time compensation value for data transmission. This compensation does no match the transmission interval of the encoder position. This causes an error in the rotor position the impact of which increases with increasing speed.
Diagnostics options?
Vibration of the current controller can be recorded by means of the Engineer oscilloscope.
By reducing the current controller gain, it may be possible to shift the time of vibration towards higher speeds. Vibration, however, cannot be reliably avoided.
Short-term measures/recommendations?
None.
Evaluation:
After a device replacement with a FW upgrade, the occurrence of the response causes instabilities in the control up to the response of a device monitoring function. There is no effective application remedy. Depending on the load conditions, the response may only occur during the production process and not under commissioning conditions.
