If a mains power failure is detected, the following reaction may occur:
• The energy stored in the drive, is used to maintain the DC link. The DC link is
controlled to a constant DC link voltage.
• The drive is brought to a standstill at a constant torque limit.
4.4.22.1 Function description
4.4.22.1.1 Function and power flow in the CDM
During operation of a CDM, the mains AC voltage is converted into DC voltage by
the input rectifier and by way a DC link is kept at a constant voltage level. This DC
voltage is converted by the output inverter into AC voltage which supplies the con-
nected motor.
4.4.22.1.1.1 Motor operation
During motor operation, power is taken from the mains and converted into move-
ment in the motor. The DC link voltage remains constant in this operating state, no
energy is converted into heat in the braking resistor.
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