en/ACS800-04/U4 Hardware Manuals - VAE ProSys sro
en/ACS800-04/U4 Hardware Manuals - VAE ProSys sro
en/ACS800-04/U4 Hardware Manuals - VAE ProSys sro
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50Prev<strong>en</strong>tion of Unexpected StartThe drive can be equipped with an optional Prev<strong>en</strong>tion of Unexpected Start functionaccording to standards IEC/EN 602<strong>04</strong>-1: 1997; ISO/DIS 14118: 2000 and EN 1037:1996.The Prev<strong>en</strong>tion of Unexpected Start function disables the control voltage of thepower semiconductors, thus prev<strong>en</strong>ting the inverter from g<strong>en</strong>erating the AC voltagerequired to rotate the motor. By using this function, short-time operations (likecleaning) and/or maint<strong>en</strong>ance work on non-electrical parts of the machinery can beperformed without switching off the AC power supply to the drive.The operator activates the Prev<strong>en</strong>tion of Unexpected Start function by op<strong>en</strong>ing aswitch on a control desk. An indicating lamp on the control desk will light, signallingthat the prev<strong>en</strong>tion is active. The switch can be locked out.A Gate Driver Power Supply board (AGPS) and a 3 m connection wire are deliveredwith the Prev<strong>en</strong>tion of Unexpected Start option kit. The Prev<strong>en</strong>tion of UnexpectedStart function complies with EN954-1 categories 1 and 3 wh<strong>en</strong> the followinginstallations are made:The user must install on a control desk near the machinery:• switching/disconnecting device for the circuitry. “Means shall be provided toprev<strong>en</strong>t inadvert<strong>en</strong>t, and/or mistak<strong>en</strong> closure of the disconnecting device.”EN 602<strong>04</strong>-1: 1997.• indicating lamp; on = starting the drive is prev<strong>en</strong>ted, off = drive is operative.• safety relay (type BD5935 has be<strong>en</strong> approved by ABB)(Switching/disconnecting device, indicating lamp and safety relay are not included inthe delivery.)For connections to the drive, see section Prev<strong>en</strong>tion of Unexpected Start, AGPSboard in chapter Electrical installation.WARNING! The Prev<strong>en</strong>tion of Unexpected Start function does not disconnect thevoltage of the main and auxiliary circuits from the drive. Therefore maint<strong>en</strong>ance workon electrical parts of the drive or the motor can only be carried out after isolating thedrive system from the main supply.Note: The Prev<strong>en</strong>tion of Unexpected Start function is not int<strong>en</strong>ded for stopping thedrive. If a running drive is stopped by using the Prev<strong>en</strong>tion of Unexpected Startfunction, the drive will cut off the motor supply voltage and the motor will coast tostop.Planning the electrical installation
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