Guidelines for planning the electrical installation 63
Implementing the Emergency stop function
For safety reasons, install the emergency stop devices at each operator control station
and at other operating stations where emergency stop may be needed. You can implement
the emergency stop function using the Safe torque off function of the drive module (see
chapter Safe torque off function on page 139). Design the emergency stop according to
relevant standards.
Note: Pressing the stop key on the control panel of the drive does not generate an
emergency stop of the motor or separate the drive from dangerous potential.
Implementing the Safe torque off function
See chapter Safe torque off function on page 139.
Implementing the Power loss ride-through function
Implement the power-loss ride-through function as follows:
• Check that the power-loss ride-through function of the drive is enabled with parameter
30.31 Undervoltage control.
• Set parameter 21.01 Vector start mode to Automatic (in vector mode) or parameter
21.19 Scalar start mode to Automatic (in scalar mode) to make flying start (starting
into a rotating motor) possible. If the installation is equipped with a main contactor,
prevent its tripping at the input power break. For example, use a time delay relay
(hold) in the contactor control circuit.
WARNING! Make sure that the flying restart of the motor will not cause any
danger. If you are in doubt, do not implement the Power-loss ride-through
function.
Using power factor compensation capacitors with the
drive
Power factor compensation is not needed with AC drives. However, if a drive is to be
connected in a system with compensation capacitors installed, contact ABB for
instructions.
Implementing a safety switch between the drive and the
motor
We recommended that you install a safety switch between the permanent magnet motor
and the drive output. The switch is needed to isolate the motor during any maintenance
work on the drive.
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