User Manual

Gold Bassoon Installation Guide
MAN-G-BASIG-EC (Ver. 1.002)
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Table of Contents
6.3.1.2 Single-Phase Direct-to-Mains Connection Topology
Figure 13: Non-Isolated Single-Phase Source - Connection Topology
6.3.2 Shunt Regulator
A shunt regulator is included in the Gold Bassoon. The shunt regulator is a switching type, wherein
the dissipative element (power resistor) is 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, to prevent the servo drive from disabling itself as a result of an “over-voltage”
type reason.
When the capacitors charge-up reaches the predetermined shunt threshold level, the shunt
regulator begins its regulating action. The bus is regulated to 385 VDC, until the regeneration-
energy is dissipated.
6.3.3 Fault Protection
The Gold Bassoon includes a duty cycle limiter, which inhibits shunt whenever On and Off time
exceeds 2%. This feature protects the shunt regulator when high-inertia loads are driven by the
servo drive(s) or when too high AC voltage is applied to the power supply (i.e. DC output is already
above the threshold of the shunt).