A motor drive unit alarm level setting means

The present invention provides a motor driving apparatus having the alarm level setting unit, a motor drive device includes: a forward converter, which enables the DC power and AC power supply side of the DC-side of the electric power conversion between the two; the reverse converter DC power is converted to DC side of the AC power for driving a motor output to the motor side, and the regenerative power from the motor side of the AC into DC power and outputs the DC side; the DC link section, its forward converter DC flyback converter side direct-current side is connected, and having a capacitor capable of storing DC power; voltage detecting unit, which detects the DC voltage value of the capacitor; alarm level setting unit that sets the DC voltage value of the capacitor alarm levels; alarm determination unit that determines the detected DC voltage value exceeds the alarm level; alarm notification unit determines that it is more than the alarm level, the alarm notification section notify conversion action against flyback converter stop command .