Eliminated from:
Inverter Drives 8400 StateLine, HighLine, and TopLine from firmware version 12.00.00.00
Behaviour of the new version?
When DC-injection braking is deactivated, the LS_MotorInterface.nHlgSetValue_a ramp function generator setpoint is loaded with the actual speed value instead of zero.
Which products are affected?
Inverter Drives 8400 StateLine, HighLine, and TopLine with a firmware version lower than 12.00.00.00
What happens?
When DC-injection braking is deactivated, there is a jerk in the motor.
When does the problem occur
In all motor control modes with a speed feedback. When DC-injection braking is deactivated, the ramp function generator setpoint LS_MotorInterface.nHlgSetValue_a is initialised with zero instead of the current speed. The jerk increases with increasing speed which is applied after the DC-injection braking.
Diagnostics options?
If the behaviour is noticed, the L_NSet_1.nCinhVal_a ramp function generator can be supplied with the current speed LS_MotorInterface.nMotorSpeedAct_a for testing purposes. The jerk should not occur then.
Short-term measures/recommendations?
None.
Evaluation:
The impacts of the behaviour are usually not so distinct that a monitoring function is activated. If the deactivation of DC-injection braking is not explicitly tested at n_act ≠0, the behaviour is not detected during commissioning.
