| 摘要 |
PURPOSE:To enable to effectively protect a motor and a controller by operating current limiter when the current flowed to a motor exceeds the set value or larger for the set period or longer. CONSTITUTION:A servo controller 9 supplies a current (c) of the prescribed direction to a motor 7 in response to the deviation between a position feedback signal (a) and a movement command signal (b). A motor current detector 11 detects the motor current (c) and a forward current comparator 13 and a reverse current comparator 15 respectively output a forward overload signal (f) and a reverse overload signal (j) when the motor current signals become forward overload reference current value (e) and reverse overload reference current value (h) or higher. An operation timer 16 applies a time out signal to an operation instruction unit 17 when the signal (f) or (j) is inputted at the set time. In this manner, a current limiter 18 suppresses the motor current. |
