ABB ACS380 Series, Руководство по оборудованию

Страница: 58 / 186

58 Planning the electrical installation
Note: The stop key on the control panel of the drive does not generate an emergency
stop or separate the drive from dangerous potential.
Implementing the Safe torque off function
Refer to Safe torque off function on page 139 .
Using a safety switch between the drive and motor
Install a safety switch between the permanent magnet motor and the drive output.
The safety switch isolates the motor from the drive during maintenance work.
Using a contactor between the drive and motor
The control of the output contactor depends on how you use the drive.
When you use the vector control mode and motor ramp stop, open the contactor as
follows:
1. Give a stop command to the drive.
2. Wait until the drive stops the motor.
3. Open the contactor.
When you use the vector control mode and motor coast stop or the scalar control
mode, open the contactor as follows:
1. Give a stop command to the drive.
2. Open the contactor.
WARNING! In the vector control mode, do not open the output contactor when
the drive controls the motor. The vector control operates faster than the
contactor opens its contacts. If the contactor starts to open when the drive controls
the motor, the vector control tries to maintain the load current and increases the
output voltage to the maximum. This can cause damage to the contactor.