Description
ACOPOS servo drives have a built-in secure restart inhibit to guarantee that the device is stopped securely and to prevent it from restarting unexpectedly. It is designed to correspond to safety category 3 according to EN 954-1. 1) In addition to preventing the device from restarting unexpectedly according to EN 1037, this safety function also meets the requirements of IEC 60204-1 regarding the stop function for categories 0 and 1. Both stop functions require the supply to the machine drives to be switched off (immediately for category 0 and after stopping for category 1). The restart inhibit interrupts the supply to the motor by preventing the pulses to the IGBTs. In this way, a rotating field can no longer be creating in synchronous and asynchronous motors controlled by the ACOPOS servo drives. This fulfills the requirements of EN 1037 regarding preventing the device from starting unexpectedly and IEC 60204-1 regarding the stop function for categories 0 and 1.