ABB ACS580-04 - Controlling a Contactor between Drive and Motor; Implementing an ATEX-Certified Motor Thermal Protection; Using a Safety Switch between the Drive and the Motor

Using a safety switch between the drive and the motor
ABB recommends to install a safety switch between the permanent magnet motor
and the drive output. The switch is needed to isolate the motor from the drive during
maintenance work on the drive.
Implementing an ATEX-certified motor thermal protection
With option +Q971, the drive provides ATEX-certified safe motor disconnection without
contactor using the drive Safe torque off function. To implement the thermal protection
of a motor in explosive atmosphere (Ex motor), you must also:
• use an ATEX-certified Ex motor
• order an ATEX-certified thermistor protection module for the drive (option +L537),
or acquire and install an ATEX-compliant protection relay
• do the necessary connections.
For more information, see:
Manual code
(English)
User's manual
3AXD50000030058CPTC-02 ATEX-certified thermistor protection module, Ex II (2) GD (option
+L537+Q971) user's manual
Controlling a contactor between drive and motor
The control of the output contactor depends on how you use the drive, that is, which
motor control mode and which motor stop mode you select.
If you have the vector control mode and motor ramp stop selected, open the contactor
as follows:
1. Give a stop command to the drive.
2. Wait until the drive decelerates the motor to zero speed.
3. Open the contactor.
If you have the vector control mode and motor coast stop selected, or scalar control
mode selected, open the contactor as follows:
1. Give a stop command to the drive.
2. Open the contactor.
WARNING!
When the vector control mode is in use, never open the output contactor while
the drive controls the motor. The vector control operates extremely fast, much
faster than it takes for the contactor to open its contacts. When the contactor
starts opening while the drive controls the motor, the vector control will try to
maintain the load current by immediately increasing the drive output voltage
to the maximum. This will damage, or even burn, the contactor completely.
Guidelines for planning the electrical installation 95