Protecting The Drive, Motor Cable And Input Power Cable Against Thermal Overload; Protecting The Motor Against Thermal Overload; Using Residual Current Devices (Rcd) With The Drive; Implementing A Bypass Connection - ABB ACS310 User Manual

42 Planning the electrical installation
Protecting the drive, motor cable and input power cable against
thermal overload
The drive protects itself and the input and motor cables against thermal overload
when the cables are dimensioned according to the nominal current of the drive. No
additional thermal protection devices are needed.
WARNING! If the drive is connected to multiple motors, a separate thermal
overload switch or a circuit breaker must be used for protecting each cable and
motor. These devices may require a separate fuse to cut off the short-circuit current.

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
page 130. For more information on the temperature measurement function see
section
Motor temperature measurement through the standard I/O

Using residual current devices (RCD) with the drive

ACS310-03x drives are suitable to be used with residual current devices of Type B.
Other measures for protection in case of direct or indirect contact, such as separation
from the environment by double or reinforced insulation or isolation from the supply
system by a transformer, can also be applied.

Implementing a bypass connection

WARNING! Never connect the supply power to the drive output terminals U2,
V2 and W2. Power line voltage applied to the output can result in permanent
damage to the drive.
If frequent bypassing is required, employ mechanically connected switches or
contactors to ensure that the motor terminals are not connected to the AC power line
and drive output terminals simultaneously.
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Motor Thermal Protection
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