With Safe stop 1 (SS1), at the end of the stop ramp, the drive is disabled and the setpoints of the motion axis (position, speed) are set equal to the actual values from the SSI encoder, so that the drive stops in this standstill position and is kept active after re-enabling.
However, when operating with a holding brake, the inverter remains enabled until the brake is applied and the brake closing time has started. During this time, the control circuits temporarily work against the closed brake.
Especially SSI encoders with low resolution and correspondingly higher ripple of the actual values may cause perceptible noises.
Which products are affected?
Library: L_MC1P_MotionControlBasic (FAST Motion)
Short-term measures, Evaluation / Recommendations
Regardless of the encoder system, the brake closing time should always be adjusted to the characteristics of the holding brake.
For a safe load transfer from the control system to the holding brake, a certain time overlap is required. However, the time overlap should be set as low as possible in order to avoid noise, but mainly to avoid unnecessary brake wear.
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