Prevention Of Unexpected Start - ABB ACS800-U4 Hardware Manual

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Prevention of Unexpected Start

The drive can be equipped with an optional Prevention of Unexpected Start function
according to standards IEC/EN 60204-1: 1997; ISO/DIS 14118: 2000 and EN 1037:
1996.
The Prevention of Unexpected Start function disables the control voltage of the
power semiconductors, thus preventing the inverter from generating the AC voltage
required to rotate the motor. By using this function, short-time operations (like
cleaning) and/or maintenance work on non-electrical parts of the machinery can be
performed without switching off the AC power supply to the drive.
The operator activates the Prevention of Unexpected Start function by opening a
switch on a control desk. An indicating lamp on the control desk will light, signalling
that the prevention is active. The switch can be locked out.
A Gate Driver Power Supply board (AGPS) and a 3 m connection wire are delivered
with the Prevention of Unexpected Start option kit. The Prevention of Unexpected
Start function complies with EN954-1 categories 1 and 3 when the following
installations are made:
The user must install on a control desk near the machinery:
• switching/disconnecting device for the circuitry. "Means shall be provided to
prevent inadvertent, and/or mistaken closure of the disconnecting device."
EN 60204-1: 1997.
• indicating lamp; on = starting the drive is prevented, off = drive is operative.
• safety relay (type BD5935 has been approved by ABB)
(Switching/disconnecting device, indicating lamp and safety relay are not included in
the delivery.)
For connections to the drive, see section
board
WARNING! The Prevention of Unexpected Start function does not disconnect the
voltage of the main and auxiliary circuits from the drive. Therefore maintenance work
on electrical parts of the drive or the motor can only be carried out after isolating the
drive system from the main supply.
Note: The Prevention of Unexpected Start function is not intended for stopping the
drive. If a running drive is stopped by using the Prevention of Unexpected Start
function, the drive will cut off the motor supply voltage and the motor will coast to
stop.
Planning the electrical installation
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
in chapter Electrical installation.
Prevention of Unexpected Start, AGPS