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  1. 14-11-2013 #9
    EddyCurrent's Avatar
    Lives in West Cumbria, United Kingdom.
    EddyCurrent
    Last Activity: 02-10-2024 Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,197. Received thanks 276 times, giving thanks to others 110 times. Is a beta tester for Machinists Network features.
    Some reading.

    LPC Siemens Micromaster440
    HMK Direct High Performance Drives and Positioning Systems
    Motor drives & safety interlock circuits: AC Drives: FAQ (part 3)
    Variable Speed Drives - E-stop

    My conclusion is that when someone hits the emergency stop button the drive control signals must instantly tell the drive to stop and after a short delay the power is removed from the drive input via a suitable contactor. A braking resistor would be used to slow down the load as quickly as possible but as far as I'm aware it would only be operational if the drive was powered up.
    As it happens the ABB drive I'm using has the STO function built in. I'll add a new drawing ASAP.
    Last edited by EddyCurrent; 14-11-2013 at 06:26 PM.
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