Supply Disconnecting Device; Thermal Overload And Short Circuit Protection; Thermal Overload Protection; Protection Against Short-Circuit In Motor Cable - ABB MicroFlex e190 User Manual

42 Planning the electrical installation

Supply disconnecting device

Install a hand-operated input disconnecting device (disconnecting means) between
the AC power source and the drive. The disconnecting device must be of a type that
can be locked to the open position for installation and maintenance work.
Europe:
If the drive is used in an application which must meet the European Union Machinery
Directive according to standard EN 60204-1 Safety of Machinery, the disconnecting
device must be one of the following types:
• a switch-disconnector of utilization category AC-23B (EN 60947-3)
• a disconnector that has an auxiliary contact that in all cases causes switching
devices to break the load circuit before the opening of the main contacts of the
disconnector (EN 60947-3).
Other regions：
The disconnecting means must conform to the applicable safety regulations.

Thermal overload and short circuit protection



Thermal overload protection

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.


Protection against short-circuit in motor cable

The drive protects the motor cable and the motor in a short-circuit situation when the
motor cable is dimensioned according to the nominal current of the drive. No
additional protection devices are needed.


Protection against short-circuit in the supply cable or the drive

Protect the supply cable with fuses. Fuse recommendations are given in the chapter
Technical data. When placed at the distribution board, standard IEC gG fuses or UL
type CC fuses will protect 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.
Operating time of the fuses
Check that the operating time of the fuse is below 0.5 seconds. The operating time
depends on the type, the supply network impedance, and the cross-sectional area,
material and length of the supply cable. US fuses must be of the CC "fast acting"
type. Circuit breakers cannot be used with the MicroFlex e190 for UL compliant
applications. Fuses must be used.