Усилители для пропорциональных распределительных клапанов VT-VRPA2-1-1X, VT-VRPA2-2-1X

Description Component series 1X Analog, Euro-card format For valves: 4WRE Features Differential inputs for voltage and current Four callable command value inputs, input for ramp time Digital inputs for enable, ramp, inverting and command value call-up Model T5 with 5 ramps and quadrant recognition Adjustable ramp times, step level and maximum solenoid current Reverse polarity protection for the operating voltage Switchable measuring socket with version T5 "Ready for operation" output Power supply unit with DC/DC converter without raised zero point Product description By closing the jumper J3, the ramp times specified above can be increased tenfold. Characteristic curve generator [11] Using the adjustable characteristic curve generator, step level and maximum values for positive and negative signals can be set separately, adjusted to the hydraulic requirements. The actual development of the characteristic curve through the zero point is not stepped but linear. Amplitude limiter [12] The internal command value is limited to approx. ±110 % of the nominal range. Oscillator [14] The oscillator creates the control signal for the inductive position transducer. Demodulator [15] The demodulator supplies the actual value signal of the valve spool position from the position transducer signal. 100 % ≙ 10 V Position controller [17] The position controller is optimized in a valve-specific manner. Power output stage [16] The current output stage creates the clocked solenoid current for the proportional valve. The solenoid current is limited to 2.5 A to 2.8 A per output. The output stage outputs are short-circuit-proof. The output stages are de-energized in case of an internal fault signal or if the enable signal is missing. Fault recognition [17] The position transducer cable is monitored for cable break and short-circuits on the primary side as well as for over-currents at the output stage. [ ] = Assignment to the block diagrams There is no switch-over between current and voltage input. The inputs are permanently available (see block diagram). Command value call-ups [4] Four command value signals "w1" to "w4" can be called up. The external command value voltages (command value 1 to 4) are either defined directly by the regulated voltage outputs +10 V and –10 V or by external potentiometers. If these command value inputs are directly connected to the regulated voltages, the command values are set at the potentiometers "w1" to "w4". When using external potentiometers, the internal potentiometers will function as attenuators or limiters. Only one call-up can be operated at a time. If several call-ups are operated simultaneously, call-up 1 has the lowest priority and call-up 4 has the highest priority. The respective active call-up is indicated by a yellow LED on the front plate. Command value inverting [7] The command value created internally from the input signals, the command value call-ups and the zero point offset signal can be inverted by an external signal