Implementing thermal overload and short circuit protections
￭ Protecting the input power cable against thermal overload
If the cables are dimensioned according to the nominal current of the drive, the drive thermal
overload protection protects also the input power cables against thermal overload. No
additional thermal protection devices are needed.
Addition: Equip the input power cables feeding a diode supply unit with D6D or D7D supply
module with the ABB specified fuses. Fuses protect the cable and limit short-circuit current
in the supply unit. Cabinet-installed multidrives: See ACS800-307 (+A003) diode supply
units hardware manual [3AUA0000102453 (English)]. Multidrive modules: See ACS800-304
(+A003) diode supply modules hardware manual [3AUA0000102452 (English)].
￭ Protecting the input power cable in short-circuits
Equip the input power cable with fuses or a circuit breaker to protect the cable in a
short-circuit situation. Select the fuses according to the short-circuit strength of the cable,
and its supports, etc.
Addition: Equip the input power cables feeding a diode supply unit with D6D or D7D supply
module with the ABB specified fuses. Fuses protect the cable and limit short-circuit current
in the supply unit. Cabinet-installed multidrives: See ACS800-307 (+A003) diode supply
units hardware manual [3AUA0000102453 (English)]. Multidrive modules: See ACS800-304
(+A003) diode supply modules hardware manual [3AUA0000102452 (English)].
￭ Protecting the drive against thermal overload
Cabinet-installed multidrives
The drive is equipped with thermal overload protection as standard. No additional protection
devices are needed.
Multidrive modules
Equip the diode supply unit with the ABB-specified input fuses for the thermal overload
protection and short circuit protection. See the diode supply module hardware manual.
The IGBT supply unit protects itself against thermal overload. No additional thermal overload
protection devices are needed.
The regenerative rectifier unit protects itself against thermal overload. No additional thermal
overload protection devices are needed.
The inverter unit protects itself against thermal overload. No additional thermal overload
protection devices are needed.
￭ Protecting against short-circuit inside the drive
Cabinet-installed multidrives
The drive is equipped with input fuses that restrict the drive damage and prevent damage
to adjoining equipment in case of a short-circuit inside the drive.
Addition: Equip the input power cables feeding a diode supply unit with D6D or D7D supply
module with the ABB specified fuses. Fuses protect the cable and limit short-circuit current
in the supply unit. Cabinet-installed multidrives: See ACS800-307 (+A003) diode supply
units hardware manual [3AUA0000102453 (English)]. Multidrive modules: See ACS800-304
(+A003) diode supply modules hardware manual [3AUA0000102452 (English)].
Electrical planning guidelines 31
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