iec 61800-5-2

Safe Torque Off on a Kinetix 5700: Wiring the STO Connector, and What It Does Not Do

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The STO connector on a Kinetix 5700 inverter: a dual-channel safety device with contacts 13/14 and 23/24 feeding STO-2 and STO-4, the supply common landing on STO-3, and the 16 pins of the plug named with their signals

Safe Torque Off on a Kinetix 5700: Wiring the STO Connector, and What It Does Not Do One contact of the gate switch opens a few hundred milliseconds before the other, and a second later a 2198-D032-ERS4 posts GuardStopInputFault. The axis will not come back with a normal fault reset. Both safety inputs have to … Read more

Safe Torque Off on a PowerFlex 755: How the 20-750-S Is Wired and What It Does Not Do

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The safe torque off path through a PowerFlex 755: 24 V on SP and SE from the two contacts of a safety relay, the option module between them and the gate control driver, the driver feeding the IGBT bridge, and the AC line, DC bus and motor terminals marked as still live

A 20-750-S seated in port 4 of a PowerFlex 755, SP and SE landed on separate contacts of a 440R-D22R2, twenty-four volts measured on both pairs, and the drive faults the moment the contactor closes. The SAFETY enable jumper is still on the main control board, where it ships from the factory, and the manual … Read more

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