TECO L510 (L510-101-H1) e-Stop / rapid stop help

'rapid stop' ignores the stop time parameter, and stops the motor up to the thermal limit of the VFD.
 
VFD's like the L510 have braking resistors built into the VFD, the limitation is the size and dissipation of energy. Most VFD's have the ability to hook them up to an en external braking resistor which is then switched in/out (chopper circuit) to dissipate the excess buss voltage from regeneration as it slows. The rapid stop/emergency stop typically slows the VFD down as fast as possible without triggering a fault condition which would lead to a free run mode ) no braking. In general if the purpose of the E-Stop is to stop the machine ASAP, you do not want to disconnect power from it. If the purpose of the E-Stop is to disconnect power to the VFD to prevent it from running, then a contactor serves that purpose, but you still have power going to the enclosure with the contactor. VFD's also have what is called Safe Torque Off (STO) which shuts down the output section of the VFD, this prevents the VFD from operating if under maintenance with the power on. Most E-Stop systems work off of NC loops, and there is always redundancy (at least two NC loops) as well as some systems verify the integrity of the system loops. If STO is engaged while the VFD is running then it will coast to a stop.

VFD Overvoltage Fault - troubleshooting variable frequency drives

A VFD overvoltage fault is fairly common with VFD regular usage. Call Precision Electric for VFD repair and VFD replacement quotes.
www.precision-elec.com
library.automationdirect.com

What is VFD Safe Torque Off, and How Does it Improve Safety?

What is VFD safe torque off? The safe torque off function built-in to modern VFDs significantly improves the integration of emergency stops.
library.automationdirect.com
 
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