ElmoMC Power Supplies-TAM-20 - Manual (Page 13)

Tambourine 20 Power Supply Installation Guide
MAN-TAMIG (Ver. 1.501)
|Technical Specifications| www.elmomc.com
13
Table of Contents
2.3.3 Shunt Regulator
A shunt regulator is included in the power supply section of the Tambourine 20. The shunt regulator
is a switching type, wherein dissipative elements (resistors) are switched across the DC bus,
whenever the voltage reaches a predetermined level. The function of the shunt regulator is to
regulate the voltage of the DC bus during the period of motor deceleration, when there is a net
energy outflow from the motor to the servo drive. The servo drive handles this reverse energy just
as efficiently as it provides energy to the motor, hence, most of the energy is passed through the
servo drive back to the power supply, where this returning energy charges the filter capacitors
above their normal voltage level, as determined by the AC incoming voltage.
When the capacitors charge-up reaches the predetermined shunt threshold level, the shunt
regulator begins its regulating action. The bus is regulated to the specific model type voltage, until
regeneration ceases.