Operation of the shunt regulator | Elmo DBP SERIES manual

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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.	Internal	External Reg.
			Voltage	Reg.	Current (A)
			(Vr)	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

DBP - Rev 6/93

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Elmo DBP SERIES manual Operation of the shunt regulator, Shunt specifications

Contents

Rev 6/93 DBP Rev 6/93 ELMO-WARRANTY Performance How to use this manual Flow Chart Table of Contents Step Panel H, DBP1 Description Analog Section Standard Features Type Designation Digital Section Standard Features Technical Specification General Digital I/O specificationDigital Inputs Digital Outputs Digital Outputs Digital Inputs Analog Input Analog input specification Resolver Option Feature Sensors specificationEncoder Resolver Encoder Inputs 2 RS485 Configuration 1 RS232 ConfigurationBattery backup Communication Communication Current Control System Operation RS485 and Checksum Protocol CFM Time dependent peak current limit Digital current limits Digital position and speed control Velocity Mode Position ModeServo Mode Motor Off Mode Latch Mode Direct commandProgram Input condition Digit display Hardware signalAuto restart Operation of the shunt regulator Shunt specifications Commutation signals format Internal power supply failure Temperature protectionLow back-up Battery voltage Short circuit protection DBP 3U Block Diagram DCB Block Diagram DCB Components Layout DCB Resolver Option Block Diagram Resolver Board Components Layout Function Terminal Description 8ac 4ac,2ac14ac,12ac 20ac,18acPage Page Control board Function Remarks 24a Auxiliary Encoder Complementary Input Mode 24b ResolverDirection Input For Pulse Reference voltage to the resolver must be Terminals of DBP Terminals Layout DBP Panel H Mounting Type Double Eurocard Size Type DBP-6U Rack Type Connectors Mother Boards terminals MBA-DBP/3U and MBA-DBP/6U Power Terminals for MBA-DBP/3U Power Terminals for MBA-DBP/6U Circuit common DBP Rev 6/93 Signals connector J3 Signals connector J4 Pin Function Remarks Output J1A, FAN Terminals MBA-DBP/6U only Page MBA DBP/3U MBA-DBP/6U Terminal Function Terminals for DBP mounted in Encd Circuit common DBP Rev 6/93 Signals connector J3 Signals connector J4 Pin Function Remarks Output Page Page MBA-DBP/3UE MBA-DBP/6UE RS232 Communication Port ConnectorRS485 Wiring Installation procedures Mounting Load inductance AC power supply Motors windings Wiring diagrams AC power wiring Ground Guide lines for connecting non-isolated AC suppliesDo not ground AC DBP + I option AC NON-ISOLATED DBP AC DBP Isolating Transformer NON Single Phase Connection AC DBP AC Hall Sensores Connection Hall sensors wiring RS232 Communication 4 RS232 Communication wiring RS 485 Communication 5 RS485 Communication wiring RS485 Communication Differential Encoder Connection Main encoder wiring Resolver Connection Resolver wiring Differential Auxiliary Encoder Connection Auxiliary encoder wiring Input Connection Pulse/Direction signals wiring CFM function Commutation signals formatAbort logic When using an Optical encoder Setting the auxiliary position input formatWhen using Pulse and Direction signals Selecting the communication bus Setting the R/D circuit Setting the main optical encoder formatConverter Oscillator Frequency/Amplitude Selection R228,R233 OscillatorPage OFF Page Page Page Applying Power Applying power Adjustments Establishing the communication Adjusting the current limitsChecking the feedback elements Defining the amplifier type Connecting the Motor Latch mode of the protective functionsCurrent limit adjustments Self Restart LM0 Tables and Summaries Display diagnostics Control stage board Poles DIP switch Summary of DIP switches Power stage board Poles DIP switchPoles DIP switch for Resolver Appendix a Current loop response Fig. A-1 Typical current response waveforms DBP Rev 6/93 Appendix B Adding a velocity feedback This page is Blank Appendix C Differential amplifier connection See schematic in chapter Dimensional Drawings DBP1 TOP View 104 111.76 32.3 DBP2 TOP View 107 108 DBP3 TOP View 110 DBP3 Side View DBP4 TOP View DBP4 Side View DBP4 Side View DBP6 TOP View DBP6 Side View 117 DBP6 Side View DBP Rack Mounting 3U/ 13T 119 120 Front Panel for DBP 3U/13T DBP Rack Mounting 3U/20T 122 128.7 101.4123 DBP Rack Mounting 6U/14T Side View DBP Rack Mounting 6U/14T Side View 262 70.92126 DBP Rack Mounting 6U/21T Side View 128 Front Panel for DBP 6U/21T Encd 3U Encd 3U Encd 6U Encd 6U External Shunt Resistor ESR Israel List of Elmo Service Centers Finland