Phone: +39-010-659 1869 Fax: +39-010-659 1870 Web: www.gpsemi.it E-mail: [email protected] Green Power Solutions srl Via Greto di Cornigliano 6R - 16152 Genova , Italy GSCB6 SCR CONTROL BOARD Full insulation from the power circuit Insensitive to the input phase sequence Phase loss inhibit Soft-start and soft-stop functions Linear firing delay angle generation Voltage and current control loops Optional Aux. boards for communication and firing External pulse transformers LINE VOLTAGE UP TO 690V The board employs an industry-standard fixed-point 16bit DSP controller design and operates either as digital firing gate board or as stand-alone digital controller board. An auxiliary firing board is available to extend the drive capability up to 12 SCRs.The gate angle delay generation is fully digital and accepts analog control inputs. The board implements load current control loop and/or load voltage control loop. It accepts current feedback either from Current Transformer or insulated DC current feedback (0-5V or 0-10 V). Isolated RS485 and CAN interfaces are also available as optional using an auxiliary communication board. MAXIMUM RATINGS Parameter Description Conditions Value VAC (RMS) Maximum RMS mains voltage VINS (RMS) Insulation voltage between mains and control sections VCOM Analog reference command PSUP Power consumption TA Operating temperature -10 to 55 °C TS Storage temperature -65 to 65 °C ELECTRICAL CHARACTERISTICS Parameter Description PS Power supply 690 V Sine waveform T = 1min 2500 V 0 to +12 V 25 W At full load Conditions Value 2x12VAC 0.6A + 220 VAC 0 to 5 V VCOM Analog voltage type reference command αD Gate delay angle fα Gate delay angle command response frequency TSTART Soft start range 0.05 to 30 s TSTOP Soft stop range 0.05 to 30 s IGM Initial hard trigger gate current peak dIG/dt First pulse gate current derivative VGM0 First pulse open circuit gate voltage IG Sustaining short circuit gate current VG0 Open circuit gate voltage 0.5 to 179.5 deg 300 Hz With 1 ohm load resistance and 3:1 pulse transformers 2A >0.8 A/us 15 V With 1 ohm load resistance and 3:1 pulse transformers 0.5 A 7V GSCB6 SCR CONTROL BOARD Block diagram 2 x 12 VAC Local Supply 220 VAC Voltage Supervisor Synchro Unit Sync VRS, VST, VTR 3 7 RESET Phase Loss Phase Loss Logic Main Supply 12 DSP 3 Output Logic 6 6 6 Pulse Transformer Output Buffer Digital Input Unit To auxiliary firing board Inhibit 1 Inhibit 2 V/I Control Encoder 2 Input Logic 5 4 5 Amplifier Lowpass filter Analog Input Unit 3 Amplifier Lowpass filter Blocks description Unit Synchro Digital Input Analog Input Protection Adjust Output buffer Document GSCB6T002 T START T STOP RS232 Serial Interface RS485 3 CAN 2 5 IDC From mains current transformers MIN Encoder Interface 6 VCOM, IREF, VREF IDC, VDC MAX + Protection Unit I MAX / V MAX Adjust Unit SCR FIRING BOARD Description Provides opto insulated signal for mains synchronisation Defines control variable (V or I), acquires inhibit signals, provides encoder input Provides fitered input for reference and feedback signals Generates overcurrent fault signal. Current trip adjustable by means of a trimmer. Configuration of maximum and minimum delay angle, start and stop time, manual adjusting of output voltage (current) Gate pulses generation and shaping To Communication Board To SCRs SCR CONTROL BOARD Document GSCB6T002 GSCB6