WARNING!
If the drive is connected to multiple motors, use a separate circuit breaker or fuses
for protecting each motor cable and motor against overload. The drive overload
protection is tuned for the total motor load. It may not trip due to an overload in
one motor circuit only.
￭ Protecting the motor against thermal overload
According to regulations, the motor must be protected against thermal overload and the
current must be switched off when overload is detected. The drive includes a motor thermal
protection function that protects the motor and switches off the current when necessary.
Depending on a drive parameter value, the function either monitors a calculated temperature
value (based on a motor thermal model) or an actual temperature indication given by motor
temperature sensors.
The motor thermal protection model supports thermal memory retention and speed sensitivity.
The user can tune the thermal model further by feeding in additional motor and load data.
The most common temperature sensors are:
• motor sizes IEC180…225: thermal switch, for example Klixon
• motor sizes IEC200…250 and larger: PTC or Pt100.
See the firmware manual for more information on the motor thermal protection function.
￭ Protecting the drive against ground faults
The drive is equipped with an internal ground fault protective function to protect the unit
against ground faults in the motor and motor cable. This function is not a personnel safety
or a fire protection feature. See the firmware manual for more information.
Residual current device compatibility
The drive is suitable to be used with residual current devices of Type B.
Note:
As standard, the drive contains capacitors connected between the main circuit and the
frame. These capacitors and long motor cables increase the ground leakage current and
may cause nuisance faults in residual current devices.
￭ Implementing the emergency stop function
You can order the drive with an emergency stop function.
See the appropriate manual for more information.
Manual code
(English)
User’s manualOption
code
3AUA0000119895Emergency stop, stop category 0 (using main contactor/breaker)+Q951
3AUA0000119908Emergency stop, stop category 0 (using Safe torque off)+Q963
￭ Implementing the Safe Torque Off function
See chapter The Safe torque off function on page 243.
￭ Implementing the Power loss ride-through function
Implement the power-loss ride-through function as follows:
78 Guidelines for planning the electrical installation
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