| 摘要 |
PURPOSE:To surely detect the abnormality of driving parts by storing upper and lower limit current values of each driving part when a prescribed time is over from the operation start time in the state that driving parts are normally operated. CONSTITUTION:A driving signal is supplied to an AC driving circuit 3 or a DC driving circuit 5 so that power is supplied to either of devices of driving parts I and II from an AC power source part 4 or a DC power source part 6. Allowable upper limit and lower limit currents of the device (motor M1) which starts the operation and the detection time are read out from a RAM 9. The current supplied to the motor M1 at the time of the detection time after the driving start of the motor M1 is calculated based on the detection signal from a current detector 7. It is judged by a CPU 1 whether the calculated current is in the range between allowable upper and lower limits or not. If the calculated current is not there, the abnormality of the motor M1 is displayed. |
