| 摘要 |
PURPOSE:To protect a drive circuit by providing a circuit for detecting whether the phase relation of drive control signal is normal, a drive lock for disabling the operation based on an abnormal signal, and an I/O port for alarming the abnormality. CONSTITUTION:A phase detector 11 detects whether a control signal 11 is normal. Upon occurrence of abnormality, an output signal 12 is fed to a drive lock circuit 2 in order to disable a motor drive 4. The signal 12 is also fed to an I/O port 5 in order to send out the abnormal state. By such arrangement, the drive circuit 4 can be protected. |
