ABB ACS880-11, Hardware Manual

Page: 79 / 232

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 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 (L537),
or acquire and install an ATEX-compliant protection relay
• do the necessary connections.
For more information, see:
Manual code
(English) User's manual
3AUA0000132231 ATEX-certified Safe disconnection function, Ex II (2) GD for ACS880 drives
(+Q971) application guide
3AXD50000027782 FPTC-02 ATEX-certified thermistor protection module, Ex II (2) GD (option
+L537+Q971) for ACS880 drives 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 DTC motor control mode and the motor ramp stop mode selected, use
this operation sequence to open the contactor:
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 DTC motor control mode and the motor coast stop, or scalar control
mode selected, open the contactor as follows:
1. Give a stop command to the drive.
2. Open the contactor.
Guidelines for planning the electrical installation 79