Planning the electrical installation
70
Prevention of unexpected start-up
The drive can be equipped with an optional Prevention of unexpected start-up
function according to standards IEC/EN 60204-1:1997; ISO/DIS 14118:2000,
EN 1037:1996, EN ISO 12100:2003, EN954-1:1996 and EN ISO 13849-2:2003.
Note: The Prevention of unexpected start-up function is not SIL/PL classified.
The function disables the control voltage of the power semiconductors of the drive
output stage, thus preventing the motor-side converter from generating the 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 power supply to the drive.
The operator activates the Prevention of unexpected start-up function using a switch
mounted on a control desk. When the function is activated, the switch is opened, and
an indicator lamp will light.
For more information, see Safety options for ACS800 cabinet-installed drives
(+Q950, +Q951, +Q952, +Q963, +Q964, +Q967 and +Q968): Wiring, start-up and
operation instructions (3AUA0000026238 [English]).
WARNING! The Prevention of unexpected start-up function does not disconnect the
voltage of the main and auxiliary circuits from the drive. Therefore maintenance work
on electrical parts of the drive can only be carried out after isolating the drive system
from the main supply.
Note: If a running drive is stopped by using the Prevention of unexpected start-up
function, the drive will cut off the motor supply voltage and the motor will coast to
stop.
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