DC servo-amplifier VT-SR1-1X

analoganalogfor valves

Component series 1X Analog, Euro-card format For valves: 4WS2EE 10, 4WRD 16-3X, 4WRD 25-3X Features Voltage input Controller for valve flow and main control spool position Oscillator/demodulator for inductive position feedback Enable input Output stage with dither signal Measuring instrument for valve flow display Reverse polarity protection for the operating voltage The valve amplifiers operate with a push-pull output stage with bipolar transistors. The output of this output stage can be connected or disconnected by means of an enable circuit (relay K2). The enable is indicated by the LED "H2" on the front plate being illuminated. The switching voltage of all relays is defined by means of jumpers J12 and J13 to either 0 V or +UB (factory +UB). The output stage consists of an I controller with connected dither signal generator. The amplitude of the dither signal is set by means of R7. The pre-stage (current command value) is controlled via a PD controller. The actual current value returned is simultaneously indicated by the instrument on the front plate.