DD252103A3 - CIRCUIT ARRANGEMENT FOR REMOTE CONTROL AND MONITORING OF ACTUATORS - Google Patents

Abstract

The invention relates to a circuit arrangement for remote control and monitoring of actuators for motor-operated slide valves or valves in the field of district heating within individual objects, in which two commands and the multiple messages to be transmitted via a transmission line gegenlaeufig. The object of the invention is the reliability with minimal overhead, in the reduction of power consumption and saving of power in the command center. According to the invention, this is achieved by the fact that in the field office the two polarity-dependent quiescent current loops of a transmission line consisting of series circuits of optocouplers for message transmission and command reception, and in the command center of light emitting diodes and switchable electronic constant current sources as command elements. The circuit operates in the transmission circuit on quiescent current basis with time-selective interruptions of the respective quiescent current loop at command. Field of application of the invention are all the cases in which runtime-related actuators must be remotely controlled and monitored. Fig. 1

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a circuit arrangement for remote control and monitoring of actuators for motorized valves or valves in the field of district heating within individual objects, in which two commands and the multiple messages to be transmitted in opposite directions over a transmission line.

Characteristic of the known technical solutions

There are already known vein-saving remote control systems through which coded information can be transmitted over long distances by means of system-bound devices.

Furthermore, a circuit arrangement according to WP 31 717 is known, through which a control wire and a common connection line in each case a double command and in the opposite direction a double message to be transmitted by means of half-waves of an alternating current. For this arrangement, for example, to transfer ten double commands and ten dependent double messages, 10 + 1 control wires are needed.

Also known are circuits according to WP 139 772, WP 143 996 and WP 145 967 for transmitting information about a control system, in which a control wire and three common connection lines two double commands and in the opposite direction two double messages by half-waves and periodic switching of two common connection lines can be transmitted. In this case, 5 + 3 control wires are required in this circuit for the transmission of ten double commands and ten dependent thereon double messages. They have the disadvantage that when using the remote control system, the complex equipment technology is out of all proportion to the necessary command and reporting volume for an actuator, since the use of this technique is profitable only for a relatively large transfer volume between two objects, and that with the application of said Multi-wire method for the remote control of an actuator and its monitoring three or four pipelines are required because the transmission costs per unit of information by the necessary common connecting lines decreases only with increasing transmission volume.

Another disadvantage of using the multi-wire method is that only information with mutual dependence - so-called command-dependent messages - whose number corresponds to the command volume, can be transmitted via a control wire. With additional transmission of command-dependent messages, the transmission costs continue to increase.

When using the multi-wire method, six remote lines are needed for remote control and monitoring of an actuator. This high line effort is also nicht.gerechtfertigt.

All the methods described work with a contact-type technique, which requires a relatively large vessel volume and increased power consumption, whereby contact disturbances can not be ruled out.

Object of the invention

The aim of the invention is to provide a circuit arrangement with which the disadvantages of the known technical solutions are eliminated and softer the transmission of commands and messages for an actuator with maximum reliability, minimum transmission overhead and low power consumption is possible.

Explanation of the essence of the invention

The object of the invention is to provide a functionally reliable circuit arrangement for the remote control and monitoring of actuators, with which two commands and the multiple number of messages can be transmitted in opposite directions via a transmission line in opposite directions.

According to the invention, this object is achieved in that are connected via the transmission line between the field office and command two polarity-dependent quiescent current loops for information transmission in both directions and for remote feed of the command office of the field office, wherein the one closed-loop for signals of negative polarity from the series circuit of transmitting and receiving side two optocouplers, the two direction-determining diodes, the LED for information display and the transistor of the command element, and the other, the first opposite polarity polarity closed loop for positive polarity signals from the series circuit of transmitting and receiving side of two optocouplers, the two direction-determining diodes, the light emitting diode Information display and the transistor of the command element is that the lying with their transmitting sides in the quiescent current loops two optocouplers with their receiving sides each over their counter side-acting directional lock, connected via their time selection, on the associated memory and its amplifier for command execution, and that the two limit switches of the actuator to form the two positional messages via an amplifier to the transmitting side of the respective optocoupler are guided, which with its receiving side in each of which, the analog command opposite bias current loop is located.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. The accompanying drawings show

Figure 1: Femleitungskreis with transmitting and receiving part of the command and field office Figure 2: Block diagram of the device in the field office

The circuit arrangement is designed for actuators, which operate by means of motor drive slide, which have two stable positions, namely slide open (OPEN) or slide closed (CLOSE). The running time from one to the other stable position is in the minute range and depends on its size and application. In the relevant end position, the motor drive M is switched off in the direction of travel associated with it by means of limit switches. Two further limit switches dz and da are used for signal generation for the two messages "OPEN" and "CLOSED". For the two term-related indifferent messages "RIDE UP" and "RIDE CLOSE" there are no signaling contacts on the actuator, so that this information must be formed by reference / actual value comparison.

All messages for the actuator are visually displayed in the command station KS by the two light-emitting diodes VLA and VLZ, for whose assignment the following criteria were selected:

- Slide "CLOSED" = LED VLZ - red continuous

- Slide "TRAVEL CLOSE" = LED VLZ - red flashing light

- Slide "OPEN" = LED VLA - green steady light

- Slide "OPEN" = LED VLA - green Flashing light

- Control "LOCAL" = both LEDs continuous light

- Fault = both LEDs are dark

These messages are two switchable, electronic constant current sources TZ, TA, referred to in the following description as command elements, as follows:

- slide "CLOSED" = command element TZ

- Slide "OPEN" = command element TA

The circuit operates in the transmission line Fl 1, Fl 2 via polarity-dependent closed-circuit loops. Each stable position of the actuator M are associated with positive and negative half-waves of an AC voltage Ws, which in the command station KS in conjunction with the light-emitting diodes VLA, VLZ for optical display of the messages "OPEN - CLOSE", and at the same time as the operating voltage of both switchable electronic constant current sources TA, The transfer of one of the pending message opposite command, message "CLOSE" - command "OPEN", message "OPEN" - command "CLOSE" takes place by interrupting the negative or positive half-waves transmitted continuous signal within the command station KS means

the switchable, electronic constant current sources TA, TZ. Transmission and reception of negative half-waves takes place within the field AS by two optocouplers MAO, BZO, positive half-waves are assigned to the optocouplers MZO, BAO. The supply of the AC voltage Ws takes place at the inputs E 1 and E 2 of the opto-couplers BAO and BZO for the receipt of the commands "OPEN", "CLOSED". The input E 2 of the optocoupler BZO is connected to the output A 2 of the opto-coupler MAO whose output A 1 is connected to the common transmission line Fl 1 via the diode V 1. Analogously, the input E 1 of the optocoupler BAO is connected to the output A 1 of the optocoupler MZo whose other output A 2 via the diode V 2 is also located on the common transmission line Fl 1. At the other end of the transmission line Fl 1 within the command station KS are in each case in series with two oppositely connected diodes V 3, V 4, the light emitting diode VLA for optical display of the message "OPEN" and the switchable, electronic constant current source TZ for the command "CLOSE", and the light-emitting diode VLZ for optically displaying the message "CLOSED" and the switchable, electronic constant current source TA for the command "OPEN". At the collector of a TZ, and at the emitter of the other switchable, electronic constant current source TA is the other pole of the AC voltage Ws. - Sieves Figure 1 -

The signal processing will be described according to block diagram, Figure 2.

With the slide position "CLOSED", the limit switch dz is closed, as shown, so that this information "ZU" is written in the message memory MZ 1. At the same time, the signal corresponding to this information for the transmission of the message "ZU" is fed to the amplifier MZV for the opto-coupler MZO, by which positive half-waves are transmitted to the command station KS via the transmission line Fl 1. These positive half-waves are simultaneously transmitted to the optocoupler BAO for command reception "OPEN" whose output is connected to the negated input of the directional interlock for the command "OPEN" BA 3. The analogue signal of the slide position "CLOSED" is still at the clearing input of the message memory MA 1 for the message "OPEN" and to the negated one Inputs of the comparator MA 2 for the message "OPEN OPEN", the command memory BZ 1 for command "CLOSED" and at the input of the directional lock BA 3 for their activation By pressing the command key TA within the command station KS by opening the assigned closed-circuit current loop Half-waves on the pipeline Fl 1 interrupted, from the Optok BAO for command reception no positive half-waves are received and the signal at the negated input of the directional interlocking BA 3 for command "OPEN" is canceled. Thus, the output of the directional lock BA 3 is performed on the deletion circuit LS and the time selection BA 2. On equivalence with the selective command pulse, the time selection BA 2 supplies its output signal to the command memory BA 1 and thus writes the information "UP." The actuator M is switched on via the amplifier BAV for the command "OPEN". When inputting too short or too long command pulses, the timing selector BA 2 judges this to be a fault and does not execute the command "OPEN." Since the output of the amplifier BAV for the command "OPEN" is connected to the directional lock BZ 3 at the negated input for the duration of the life of the actuator M, a blocking signal applied. The actuation of the actuator M opens its limit switch dz and interrupts the signals present at the directional interlocking BA 3 and at the MZV amplifier for the MZO opto-coupler, message "CLOSE." As a result, no positive half-waves are transmitted from the optocoupler MZO to the command station KS the signal present at the clear input of the message memory MA 1 for the message "OPEN" and the signal present at the negated input of the comparator MA 2 for the message "OPEN OPEN" and at the clear input of the command memory BZ 1 for the command "CLOSE" are canceled. Since the information registered in the message memory MZ 1 for the message "CLOSED" is maintained until the other stable position of the actuator M is reached, the signal at the comparator MA 2 becomes effective for the message "OPEN". In connection with the pending signal of the flashing clock TG, the comparator MA 2 activates the amplifier MAV for the opto-coupler MAO for the message "OPEN OPEN", by means of which the flashing clock with negative half-waves is switched to the transmission line Fl 1. This information remains for the flashing clock This gives a continuous signal to the amplifier MAV for the opto-coupler MAO, message "OPEN", and transmits this continuous signal via the long-distance line F1 with negative half-waves. At the same time, the message memory MZ 1 is deleted by the applied signal at its clear input. The instruction memory MZ 2 is blocked by the same pending signal at the respectively negated input, and the directional lock BZ 3 is activated for the instruction "CLOSE." Through the limit switch da, the information "OPEN" in the message memory MA 1 for the message "OPEN" inscribed, whose output leads the signal to the comparator MZ 2 for the message "RIDE CLOSE", which becomes active only with the release of the blocking signal at the negated input. The transmission of the command "ZU" and the information processing within the field office AS takes place in the same way.In the block diagram of Figure 2, the possibility of control "LOCAL" for service operation is not shown. For driving, a "LOCAL" switch installed inside the field station AS disconnects the motor of the actuator M from the remote control to allow local control, while the "LOCAL" switch sends a continuous signal to both inputs the message memory MZ 1 and MA 1 are set, which lock both mutually on their negated inputs. This continuous signal is simultaneously transmitted via the amplifiers MAV and MZV in conjunction with the downstream optocouplers MAO and MZO with negative and positive half-waves to the command station Ks and there optically indicated by the two LEDs VLA and VLZ.

Claims (4)

1. A circuit arrangement for the remote control and monitoring of actuators via a vein-saving control system, in particular for the transmission of commands in one and message in the other direction, which are transmitted by positive and negative half-waves ejner AC voltage via a trunk, characterized in that on the Remote line (Fl V; Fl 2) between field station (AS) and command station (KS) two polarity-dependent quiescent current loops for information transmission in both directions and for remote feeding of the command station (KS) from the field office (AS), and wherein the one quiescent current loop for signals negative Polarity of the series connection of transmitting and receiving side (A 1, A 2 / E 1, E 2) of two optocouplers (MAO, BZO), the two direction-determining diodes (V 1, V 3), the light-emitting diode (VLA) for information display and the transistor of the command element (TZ), and the other, to the first oppositely polarized Ruhestromschlei fe for signals of positive polarity from the series connection of transmitting and receiving side (A 1, A 2 / E 1, E 2) of two optocouplers (MZO, BAO) the two direction-determining diodes (V 2, V 4), the light emitting diode (VLZ) for information display and the transistor of the command element (TA) is that the lying with their transmitting sides (E 1, E 2) in the quiescent current loops two optocouplers (BZO, BAO) with their receiving sides (A 1, A 2) respectively via their mutually acting Directional lock (BA 3, BZ 3), via their time selection (BA 2, BZ 2) via the associated memory (BA 1, BZ 1) and their amplifiers (BAV, BZV) are connected to the command execution, and that the two limit switches (da , dz) of the actuator (M) to form the two position reports via one amplifier (MZV, MAV) to the transmitting side (E 1, E 2) of the respective optocoupler (MAO, MZO) are guided, which with its receiving side (A 1 , A 2) in the opposite, the analogous command opposite Ruh estromschleife lies. 2. Circuit arrangement according to item 1, characterized in that in each case via the opposing message memory (MA 1, MZ 1) for transmission of time-dependent indifferent messages to the clock (TG) connected to each comparator (MA 2, MZ 2) in addition to the associated amplifier ( MAV, MZV). 3. Circuit arrangement according to item 1, characterized in that to form a further message (LOCAL control) at both message memories (MA 1, MZ 1) via a "LOCAL Umschaiter" a continuous signal is applied. 4. Circuit arrangement according to item 1, characterized in that lying between the emitter and base of the transistor from the command element (TZ), in the closed-loop for signals of negative polarity, and between the collector and base of the transistor from the command element (TA), in the quiescent current loop for signals positive polarity, each one quiescent current key is in series with a resistor.