Separate Control Cable Ducts; Protecting The Drive, Input Power Cable, Motor And Motor Cable In Short Circuit Situations And Against Thermal Overload; Protecting The Input Cabling And The Drive Upon A Short-Circuit; Protecting The Motor And Motor Cable In Short-Circuits - ABB ACS880-37LC-0390A-7 Hardware Manual

Separate control cable ducts

￭
Put 24 V DC and 230 V AC (120 V AC) control cables in separate ducts, unless the 24 V DC
cable is insulated for 230 V AC (120 V AC) or insulated with an insulation sleeving for
230 V AC (120 V AC).
Protecting the drive, input power cable, motor and motor
cable in short circuit situations and against thermal
overload

Protecting the input cabling and the drive upon a short-circuit

￭
To protect the input cable in short-circuit situations, install fuses or a suitable circuit breaker
at the supply side of the cabling.
The drive is equipped with fuses as standard. In case of a short-circuit inside the drive, the
fuses protect the drive, restrict drive damage, and prevent damage to adjoining equipment.

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 output current of the drive.

Protecting the drive and the power 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 motor thermal protection model supports thermal memory retention and speed sensitivity.
The user can tune the thermal model further by feeding in additional motor and load data.
Guidelines for planning the electrical installation 85
230 V AC
(120 V AC)
230 V AC
(120 V AC)
24 V DC
24 V DC