Thyristor speed control unit

Features

• Mains switch and delayed response main contactor for armature and exciter voltages
• Separate fuses, which can be serviced externally, for excitation, the electronic components and three-phase current
• Exciter voltage output: 220 V, 1 A
• Thyristor power circuit with two fully controlled B6 bridges for
  circulating current-free four-quadrant operation, nominal data (U_L1N = 90 V): 0...230 V, 12 A, Indication of the active static converter via 2 LEDs
• Complete electrical isolation between power circuit and control and regulating unit
• Extensive fault monitoring with signalling and switch-off. Activation for phase-failure, rotating field fault, machine or equipment overheating and time limit
• Control and regulating electronics with extensive indication, setting and measuring possibilities

• Potentiometer for the setpoint encoder with changeover switch for single quadrant and four quadrant operation
• Run-up integrator with potentiometer for the run-up time: 0.1...100 V/s
• Speed controller with summing point:
  Two inverting input and one non-inverting input
• Variable gain V_N = 1...10 for actual speed value
• Coarse and fine adjustment of the proportional action coefficient:
  K_PN = 0.5...5/5...50
• Coarse and fine adjustment of the reset time:
  T_NN = 0.1 s...1 s/1 s...10 s
  I controller can be switched off
• Overdrive indication via LED
• Both converters I and II have a potentiometer for current limitation
  I_{max I} = 0...12 A
  I_{max II} = 0...12 A
• Instantaneous comparator with adjustable hysteresis
• Absolute-value generator with measurement socket for control signal INVert
• Adaptive current controller with summing point:
  Two inverting inputs and one non-inverting input
  Recognition of intermittent current with LED display and measurement socket for the control signal STL (intermittent current)
  Reduction of the reset time to 1/10, when intermittent current is present, can be switched off
  Coarse and fine adjustment of the proportional action coefficient:
  K_PI = 0.05...0.5/0.25...2.5
  Coarse and fine adjustment of the reset time:
  T_NI = 10 ms...100 ms/100 ms...1 s
  I controller can be switched off
  Overdrive indication with LED
• Control angle limiter with the following setting options: Rectifier stability limit 0°...80°
  Inverter stability limit 180°...100°

• Switching logic with measurement sockets for the control signals and with a control input STOP

• Four-quadrant indication with 4 LEDs

• Current measurement with current converters
• The control set provides six double-pulse trains which are switched through to the thyristors of the rectifiers I or II via 12 gate pulse transformers

Supply voltage

• Control unit: 230 V, 50 Hz
• Power circuit: via external three-phase transformer
  3 x 45/90 V, 50 Hz (735 32)