ABB ACS880-34 Series - Protecting the Drive and Input Cable in Short-Circuits and against Thermal Overload; Protecting the Drive and the Input Power Cable in Short-Circuits; Circuit Breakers; Protecting the Drive and the Input Power Cable against Thermal Overload

Protecting the drive and input cable in short-circuits and
against thermal overload
￭ Protecting the drive and the input power cable in short-circuits
Protect the drive (1) with fuses (a) and the input cable with fuses (b) or a circuit breaker.
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b a
1
Size the fuses or the circuit breaker according to local regulations for the input cable
protection. Select the fuses for the drive according to the instructions given in the technical
data. The fuses for the drive protection will restrict drive damage and prevent damage to
adjoining equipment in case of a short-circuit inside the drive.
Note: If the fuses for the drive protection are placed at the distribution board and the input
cable is dimensioned according to the nominal input current of the drive given in the technical
data, the fuses protect also 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. No
separate fuses for the input cable protection are needed.
Circuit breakers
Circuit breakers must not be used without fuses.
￭ Protecting the drive and the input power cable against thermal overload
The drive protects itself and the input power cable 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, 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.
Implementing a motor temperature sensor connection
WARNING!
IEC 60664 and IEC 61800-5-1 require double or reinforced insulation between
live parts and accessible parts when:
• the accessible parts are not conductive, or
• the accessible parts are conductive, but not connected to the protective earth.
Obey this requirement when you plan the connection of the motor temperature
sensor to the drive.
You have these implementation alternatives:
86 Guidelines for planning the electrical installation