Planning the electrical installation
49
Prevention of unexpected start-up
The ACS800-07/U7 drives can be equipped with an optional Prevention of
unexpected start-up function (POUS) according to standards IEC/EN 60204-1:1997;
ISO/DIS 14118:2000 and EN 1037:1996.
The Prevention of unexpected start-up 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-up 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.
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.
For connections to the drive, see the circuit diagram delivered with the drive.
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 or the motor 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.
Summary of Contents for ACS800-U7
Page 1: ...ACS800 Hardware Manual ACS800 07 Drives 45 to 560 kW ACS800 U7 Drives 50 to 600 hp ...
Page 4: ......
Page 28: ...Operation principle and hardware description 28 ...
Page 51: ...Planning the electrical installation 51 ...
Page 60: ...Planning the electrical installation 60 ...
Page 76: ...Electrical installation 76 ...
Page 84: ...Motor control and I O board RMIO 84 ...
Page 112: ...Maintenance 112 ...
Page 138: ...Dimensional drawings 138 Frame sizes R5 and R6 64778340_1 5 K ...
Page 139: ...Dimensional drawings 139 Frame sizes R7 and R8 68749930_1 7 C ...
Page 140: ...Dimensional drawings 140 IP54 and IP54R units of frame sizes R7 and R8 68749930_6 6 C ...
Page 148: ...3AFE64702165 Rev H EN 2012 09 19 Contact us www abb com drives www abb com drivespartners ...