MicroMaster 6SE92 - ECT Sales & Service

MICROMASTERMICROMASTER VectorMIDIMASTER VectorPrinciples of Operation2.3.1 Merits of COMPOUND BRAKING TM v’s DC Injection and Regenerative BrakingRegenerative Braking• Energy dissipated in external resistor.• Excellent braking torque.• Smooth.• In control.• Speed reduces linearly and smoothly.DC Injection Braking• Energy dissipated in motor.• Poor braking torque.• Smooth.• No control of ramp down.• 30 - 40% effectiveness of regenerative braking.• Stopping of motor shaft unknown.COMPOUND BRAKING• Energy dissipated in motor.• Good braking torque.• In control.• 50-60% effectiveness of regenerative braking.• Speed reduces linearly.• Slight speed ripple may be seen due to oscillating torque -dependent on load inertia.Siemens DA 64 – 1998/99 (04/99) 2/7