Protecting The Motor And Motor Cable In Short-Circuits; Protecting The Motor Cables Against Thermal Overload; Protecting The Motor Against Thermal Overload; Protecting The Motor Against Overload Without Thermal Model Or Temperature Sensors - ABB ACH580-01 Hardware Manual

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Protecting the motor and motor cable in short-circuits

The drive protects the motor cable and motor in a short-circuit situation when the motor
cable is sized according to the nominal output current of the drive.
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Protecting the motor cables against thermal overload

The drive protects the motor cables against thermal overload when the cables are sized
according to the nominal output current of the drive. No additional thermal protection
devices are needed.
WARNING!
If the drive is connected to multiple motors, use a separate overload protection
for each motor cable and motor. The drive overload protection is tuned for the
total motor load. It may not detect an overload in one motor circuit only.
North America: The local code (NEC) requires an overload protection and a
short-circuit protection for each motor circuit. Use, for example:
• a manual motor protector
• circuit breaker, contactor and overload relay or
• fuses, contactor and overload relay.
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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 sensor types are PTC or Pt100.
For more information, see the firmware manual.
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Protecting the motor against overload without thermal model or
temperature sensors
Motor overload protection protects the motor against overload without using motor
thermal model or temperature sensors.
Motor overload protection is required and specified by multiple standards including the
US National Electric Code (NEC) and the common UL/IEC 61800-5-1 standard in
Guidelines for planning the electrical installation 107