ABB ACS850 Series Application Manual

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Contents

ABB ACS850 Series Application Manual Manual pdf 14 page image

14 Implementing a Safe disconnection function Connection diagramThe diagram below shows the connections. The system integrator must acquire thecomponents and do the installations drawn outside the drive border line.The output contact of the protective relay can be connected in series with another Safetorque off activation switch/relay (if present).When you install the equipment, make sure that you maintain separation of the switching(safety) signal with any other signals.1) An ATEX-compliant protective relay. The relay monitors a sensor circuit, and activates the Safe torque offfunction of the drive by opening the control circuits when necessary.2) You can use the drive STO function for several external safety functions at the same time (for example,ATEX-compliant thermal motor protection, and emergency stop). If you do, you must connect the STOactivation switches or relays used in other safety functions in series with the ATEX-complaint protectiverelay.3) Connected to a digital input on the control board for the protection relay status indication.4) The STO function of the drive must always have redundant connection. Connect the XSTO terminals 3and 4 in accordance with the above figure.+24 VControlcircuitACS8502) Safe torque offactivation switch or relay(open = active)3 3 3~Exmotor3 ~ supplyProtective relay1)ControlcircuitControl voltageSensorPotentially explosiveatmosphereXSTOXSTO134XDI 3)4)1+24 VXD24