ABB ACS800-01 Manuel D'installation page 8

4
WARNING! The Safe torque off 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 Safe torque off function can be used for stopping the drive in emergency
stop situations. In the normal operating mode, use the Stop command instead. If a
running drive is stopped by using the function, the drive will trip and stop by coasting.
If this is not acceptable, e.g. causes danger, the drive and machinery must be
stopped using the appropriate stopping mode before using this function.
Note concerning permanent magnet motor drives in case of a multiple IGBT
power semiconductor failure: In spite of the activation of the Safe torque off
function, the drive system can produce an alignment torque which maximally rotates
the motor shaft by 180/p degrees. p denotes the pole pair number.
Note: If you add or modify the wiring in the drive safety circuits, ensure that the
appropriate standards (e.g. IEC 61800-5-1, EN 62061, EN/ISO 13849-1 and -2) and
the ABB guidelines are met. After making the changes, verify the operation of the
safety function by testing it.
CHANGED (page 62-63): Connecting the control cables / Terminals
Frame sizes R2 to R4 and Frame sizes R5 and R6:
X41 - Terminal for optional Prevention of unexpected start (+Q950) or optional Safe
torque off (+Q967)
NEW (page 73): Installation of ASTO board (Safe torque off, +Q967)
What this chapter contains
This chapter describes
• electrical installation of the optional Safe torque off function (+Q967) of the drive.
• specifications of the board.
Safe torque off (+Q967)
The optional Safe torque off function includes an ASTO board, which is connected to
the drive and an external power supply. See also chapter Safe torque off (page 2 in
this Update Notice).
Update Notice