ROTATION DRIVE DEVICE FOR CONSTRUCTION MACHINE

摘要

Provided is a rotation drive apparatus for rotating an upper rotary body of a construction machine, the rotation drive apparatus eliminating, while achieving a fundamental goal of stopping a rotation when an emergency stop operation is performed, wasteful stopping by a parking brake. The apparatus includes: an emergency stop switch (20); a rotation control section (12, 19) which performs control to stop a rotating motor (11) when the emergency stop operation is applied to the emergency stop switch (20); and a timer (21) which activates the parking brake (15) when a set period of time has elapsed after the emergency stop operation is performed. Preferably, the rotation control section (12, 19) detects a failure of an inverter (12) and causes the parking brake (15) to perform a braking operation before the elapse of the set period of time when the failure is detected.