ABB ACS580-07-0495A-4, Руководство по оборудованию

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58 Guidelines for planning the electrical installation
Implementing thermal overload and short-circuit
protection

Protecting the drive and input power cable in short-circuits
The drive is equipped with internal AC fuses (1) as standard. The fuses restrict drive
damage and prevent damage to adjoining equipment in case of a short-circuit inside the
drive.
Protect the input cable with fuses or circuit breaker (2) according to local safety
regulations, appropriate input voltage and the rated current of the drive (see chapter
Technical data ).

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 current of the drive. No additional protection
devices are needed.

Protecting the drive and the input power and motor cables against
thermal overload
The drive protects itself and the input and motor cables against thermal overload when the
cables are sized according to the nominal current of the drive. No additional thermal
protection devices are needed.
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 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, eg, Klixon
•
motor sizes IEC200…250 and larger: PTC or Pt100.
For more information, see the firmware manual.
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