Protecting The Input Power Cable Against Thermal Overload; Cabinet-Installed Multidrives; Multidrive Modules; Protecting The Drive Against Thermal Overload - ABB ACS880 Manual

38 Electrical planning guidelines

Protecting the input power cable against thermal overload

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Cabinet-installed multidrives

The drive has overload protection as standard. If the sizing of the input power cable
is correct, the drive overload protection protects also the cable against overload. In
case of parallel input power cables, it may be necessary to protect each cable
separately. Obey the local regulations.

Multidrive modules

Drive with ACS880-304LC...+A018 diode supply module or ACS880-204LC IGBT supply
module: The drive has an overload protection as standard when the supply unit, inverter
units and other units are sized and installed correctly. See the appropriate hardware
manuals. If the sizing of the input power cable is correct, the drive overload protection
protects also the cable against overload. In case of parallel input power cables, it may
be necessary to protect each cable separately. Obey the local regulations.
Drive with ACS880-304LC...+A019 supply module: To protect the input cable against
overload, install fuses or a suitable circuit breaker at the supply side of the cabling. If
you use parallel cables, protect each cable against thermal overload individually. Obey
the cabling and protection instructions in ACS880-304LC...+A019 diode supply modules
hardware manual (3AXD50000045157 [English]).

Protecting the drive against thermal overload

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Cabinet-installed multidrives
The drive has overload protection as standard.
Multidrive modules
The drive has an overload protection as standard when the supply unit, inverter units
and other units are sized and installed correctly. See the appropriate hardware manuals.

Protecting the motor cables against thermal overload

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The inverter unit protects the motor cables against thermal overload when the cables
are sized according to the nominal output current of the inverter unit. No additional
thermal protection devices are needed.
WARNING!
If the inverter unit 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.

Protecting the motor against thermal overload

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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