![]() To get around this I monitor the inputs on the drive (you have to set a couple of parameters to put them in the status word), and if the switch is turned on I continue to read from the drive, but I don't write any commands to it. PowerFlex 525 Variable Frequency Drive Setup, Integration & PLC. Safety Function: Actuator Subsystems Stop Category 1 via the. Refer to the appropriate user IMPORTANT manual for guidance on removing these jumpers. I'm not sure if it's the same issue exists with Ethernet, but when using MODBUS you can cause errors if you continue to write to the drives after they've been switched over to keypad control. PowerFlex 520-Series Adjustable Frequency AC Drive User Manual, publication 520-UM001 Both the PowerFlex 525 and PowerFlex 527 drives ship with the STO feature disabled by jumpers. ![]() ![]() PowerFlex 750-Series Safe Torque Off User Manual. Now I put a small switch inside the enclosure, and when they turn it on it allows them to use the keypad and speed pot on the drive to control them. PowerFlex 525 AC Drive st1 drive of the next generation of Allen-Bradley PowerFlex compact drives. ![]() I used to put HOA switches on everything, with a FWD/REV selector, and a speed pot, but it's so rarely used I stopped doing it. In my application the concern is that if the PLC dies while they're at sea, they need to be able to run the drives manually. I do it all the time on boats, except I'm using RS485 as the primary control instead of Ethernet, but the concept is the same. As others have said, you'll need a selector switch.
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