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.
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
Implementing the power loss ride-through function
If the incoming supply voltage is cut off, the drive will continue to operate by
utilizing the kinetic energy of the rotating motor. The drive will be fully operational
as long as the motor rotates and generates energy to the drive.
If you equip the drive with a main contactor or breaker, make sure that it restores
the drive input power after a short break. The contactor must either re-connect
Guidelines for planning the electrical installation 121
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