I think you need a VFD with Safe Torque Off (STO) function. Jim Hulbert
From: Brian Kunde [mailto:[email protected]] Sent: Thursday, March 19, 2020 1:19 PM To: [email protected] Subject: **External**[PSES] Fwd: Emergency Stop Function If any of you have a Case of Corrona, I hope it is the type that comes in bottles or cans. First, there is a guy in this group who I chatted with in the past who is like an expert in the E-Stop function. He has a Blog or Website dedicated to this topic which I cannot currently find. Can anyone help me get in contact with him? My area of need is with integrating the E-Stop function with a Variable Frequency Drive (inverter). I have to meet the international requirements as well as the USA and Canadian requirements. What I have is 3-phase AC power, through a Contactor, to a VFD, which powers a 3-phase motor. The VFD has the motor brake feature built in. Under a normal STOP command, the VFD engages the motor brake. All is fine. The VFD manufacturer's documentation shows to connect the E-STOP to the motor Contactor which OPENs power to the VFD. When the E-Stop is engaged, power to the VFD is shut down; the motor continues to spin for up to 30 seconds or more before coming to a stop. The motor Brake does not engage because it is a feature of the VFD which is powered down. This makes no sense to me. The E-STOP is supposed to stop motion as quickly as possible without causing additional Risk (according to the MD and NFPA 79 cat.2). So how is the E-Stop function supposed to work with a VFD? How is this typically done? Are we buying the wrong VFD? Thanks to all. The Other Brian - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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