| 摘要 |
A servo press controller which can prevent the servo runaway caused by the malfunction of CPUs, the fault of a position detector, or other troubles to thereby increase the safety of the servo press. For this purpose, first to third CPUs (21, 22, 23) each of which conducts a different control among the input of the set data, the calculation of a servo position command, and the calculation of a servo speed command sends and receives watch dog signals between itself and another CPU for monitoring each other's condition by checking whether the watch dog signals sent from the partner computer are normal or not, and, when there is an abnormality in any computer, stopping the servo press (1) for emergency.
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