2 Function description
BU 0630 en-2020 11
2 Function description
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To avoid danger to persons and to prevent damage to material, machines must be able to be switched
off safely. The frequency inverters stated in this document provide safe shut-down methods.
The following basic explanation of the function of a frequency inverter serves to provide better
understanding of the function of safe shut-down methods:
The mains voltages are rectified and the resulting DC links circuit voltage is reconverted to AC
according to the requirements of the operating status of the motor (frequency and voltage).
The semiconductor switches of the inverter (T1 to T6) are controlled by a highly complex pulse
pattern. This pulse pattern is generated by the micro-controller (µC) and amplified by the driver. The
drivers convert the logic signals on the control voltages of the semiconductor switch. The
semiconductor switches are switched via the control voltage and the pulse pattern is amplified and
applied to the motor terminals. Due to the low-pass effect of the motor, a three-phase pulse width
modulated sine wave voltage, a three-phase system, results from the pulsed voltage. The motor
generates a torque.
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2.1 Design of the safe shut-down method
Structure of the Safe Pulse Block for SK 510P, SK 540P
3 Driver
Safe Pulse Block
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