Elmo SERVO AMPLIFIER DBP SERIES - Manual (Page 25)

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DBP - Rev 6/93
4.5 Operation of the shunt regulator
A shunt regulator is included in the power supply section of the DBP. The
shunt regulator is a switching type, wherein dissipative elements (resistors)
are switched across the DC bus, whenever the voltage reaches a predetermined
level (Vr). 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 amplifier. The amplifier handles this reverse
energy just as efficiently as it provides energy to the motor, hence, most of
the energy is passed through the amplifier to the power supply, where the
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 voltage level (Vr),
the shunt regulator begins its regulating action. The bus is regulated to this
range until regeneration ceases.
All the double Eurocard size amplifiers are equipped with two outputs for
connecting an external shunt resistor , hence increasing the power dissipation
capability.
SHUNT specifications
Type Reg.
Voltage
(Vr)
Internal
Reg.
Current (A)
External Reg.
Current (A)
DBP-12/135 193 13 N/A
DBP-20/135 193 26 21
DBP-8/270 383 8 N/A
DBP-16/270 383 16 12
DBPF-12/135 193 13 N/A
DBPF-20/135 193 26 N/A
DBPF-30/135 193 26 21
DBPF-8/270 383 8 N/A
DBPF-16/270 383 16 12
DBPF-24/270 383 16 12