42 Planning the electrical installation
Protecting the drive, input power cable, motor and motor
cable in short circuit situations and against thermal
overload
Protecting the drive and input power cable in short-circuit situations
Arrange the protection according to the following guidelines.
Size the fuses according to instructions given in chapter Technical data on page 383.
The fuses will protect the input cable in short-circuit situations, restrict drive damage
and prevent damage to adjoining equipment in case of a short-circuit inside the drive.
Protecting the motor and motor cable in short-circuit situations
The drive protects the motor and motor cable in a short-circuit situation when the
motor cable is dimensioned according to the nominal current of the drive. No
additional protection devices are needed.
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. It is also possible to connect a motor temperature measurement to
the drive. The user can tune both the thermal model and the temperature
measurement function further by parameters.
The most common temperature sensors are:
• motor sizes IEC180…225: thermal switch (for example Klixon)
• motor sizes IEC200…250 and larger: PTC or Pt100.
For more information on the thermal model, see section Motor thermal protection on
page 118. For more information on the temperature measurement function see
section Motor temperature measurement through the standard I/O on page 127.
Circuit diagram Short-circuit protection
Protect the drive and input
cable with fuses or ABB
manual motor starter.
M
3~
Distribution
board
Input cable Drive
1)
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