SU752234A1 - Device for automatic monitoring of diversification of relay contact switching - Google Patents

Description

one

The invention relates to test equipment used in the electronic industry in enterprises engaged in the manufacture and use of electromagnetic relays. five

There are known devices for monitoring the time parameters of a relay with contact outputs, which contain a software block, a power source, memory elements and pulse counters 1. The most closest to the proposed invention is a device for monitoring the switching difference of the relay contacts, containing a linearly increasing source voltages, power supply 15 of the contact circuit, fault recorders, each of which is connected to one of the tested contacts, and a unit for controlling the magnitude of the comm-time difference tation 2J. The specified known device does not allow detecting the leading contact, in connection with which the operator must control and adjust the relay to perform additional operations using additional equipment .25

The aim of the invention is to increase the performance of the control by determining a leading contact in a monitored relay. This goal is achieved by the fact that the device for monitoring

The switching elements of the relay contacts, containing a source of linearly rising voltage, a power source of the contact circuit, a control pulse generator, a closure recorder and a closure time difference control unit, have entered the "Prohibitory and indicators, the number of which is equal to the number of monitored contacts, each element is" Prohibited one of its inputs is connected to the output of each closure recorder, one of the outputs of each element “Zanret is connected to one input of each indicator from the indicators, and the other output of each element “The prohibition is connected to another v. by the input of another element“ Prohibition.

In addition, the unit for controlling the magnitude of the time difference of the closure is made on the two-input logic element OR and NAND and the three-input logic element AND-N, the elements OR and NAND are connected to the outputs of the closure recorders, and the outputs of these logic elements are connected to two inputs of the three-input logic element NAND, the third input of which is connected to the output of the control pulse generator.

FIG. 1 shows a block diagram of the device; in fig. 2 - the nrinsnpialny scheme of the element "Prohibition; on fng. 3 shows the time diagrams of signals in the control unit of the magnitude of the time difference.

The description of the device is shown for the control of a relay having two bunches of contacts. However, a device for controlling relays with three or more load contacts is constructed similarly, by a corresponding increase in the number of parallel channels.

To the winding of the monitored relay 1, the switches of the source of the linearly rising voltage 2. The closing contacts 3 and 4 of the monitored relay are connected to the divisor dividers and to the control inputs of the recorders 5 and 6, made in the form of triggers. Voltage dividers are connected in parallel to the power source 7 of the contact circuit. An element "Ban 8" is connected to the output of the recorder 5, one of the outputs of which is connected to the indicator 9, and the second is connected to the control input of another element "Ban 10. The elements of the" Ban 10 and indicator 11 in the recorder 6 circuit are connected in the same way. Ban 8, 10 is an AND-NOT 12 and trigger 13 logic elements connected in series (FIG. 2).

The control unit of the magnitude of the time difference includes logical elements OR 14 and AND-NOT 15, one of the inputs of which are connected to each other and to the output of the recorder 5, the second inputs are connected to each other and to the output of the recorder 6, and the outputs of the logical elements OR 14 and AND- NOT 15 is connected to the inputs of the three-input logic element AND-16.

The generator control imulses 17 is connected to the third input of the logical element AND-NOT 16.

The device works as follows.

In the initial state, at the closing contacts of the monitored relay there is a potential corresponding to a logical unit.

Iri ahead of the closure to the “ground” of one nz of closing contacts (for example, contacts 4), a negative voltage drop arrives at the input of the recorder 6. A positive single signal from the output of the recorders 6 is fed to the input of the element “Ban 10”, from the direct output of which the signal goes to the indicator AND, and from the inverse output of the element “Ban 10”, the signal arrives at the control input of the element “Ban 8” and locks it. Due to this, the signal from contact 3 that has been delayed through the element “Zanret 8 will not pass, as a result of which the indicator 9 will not receive a signal.

Similarly, when the closing contact 3 is leading ahead of time, the signal will go to the indicator 9, and the signal from the contact 4 which is delayed contacting to the indicator 11 will not arrive. Thus, on the scoreboard there is information about the contact that worked ahead.

Consider the operation of the control unit of magnitude difference.

In the initial state, the output of the logical element OR 14 has a signal corresponding to a logical zero (see diagram 18 in Fig. 3), and the output of the logical element IS-NE 15 has a signal corresponding to the logical unit (see diagram 19 in fig. 3). Iri ahead of the closure of contact 4 is a positive single signal from the output of the recorder 6

(see diagram 20 in Fig. 3) arrives at the inputs of logical elements OR 14 and AND-NOT 15. At the same time, at the output of logical element OR 14, a signal corresponding to a logical unit is output, and at the output of logical element "AND-15 has logical unit is saved. The output signals from the logical elements OR 14 and NAND are input to the three-input logic element NAND

16 and open it to pass the control pulses of the generator 17 (see diagram 21 in FIG. 3). With the closure of the late Coactac 3 a positive single signal from the output of the recorders 5

(see diagram 22 in fig. 3) arrives at the inputs of the logic element OR 14 and AND-NOT 15. At the same time, at the output of the logic element OR 14, the logical unit is saved (see diagram 18 on

FIG. 3), and the output of the logical element AND-NOT 15 will have a negative voltage drop from a logical unit to a logical zero (see diagram 19 and a, fig. 3), as a result of which the logical

the AND-NE element 16 is closed for the passage of the emulsions of the generator 17 (see diagram 21 in Fig. 3).

When the frequency of the control pulse generator 17 is 1 MHz, the number of filling pulses is numerically equal to the magnitude of the time difference in microseconds.

With the immediate closure of contact 3, the operation of the control unit of magnitude of different times is similar to the one described above.

The use of the invention contributes to an increase in the productivity of monitoring electromagnetic relays during their production and use, and also simplifies the adjustment process.

Claims (2)

1. A device for automatic control of switching contact switching timing, containing a source of linearly increasing voltage supplied to the relay coil, a power source for a coactile circuit, a generator of control pulses, a fault recorder, each of which is connected to one of the studied contacts and a control unit for the magnitude of the closure different times, characterized in that, in order to increase the control performance by detecting ojurezhayush, his contact, the elements “Prohibit and indicators, the number of which is equal to the number of monitored contacts, are entered into the device connected to the output of each closure recorder, one of the outputs of each element “The ban is connected to one input of each of the indicators, and the other output of each element“ The ban is connected to another input of the element “Prohibition. 2. The device according to claim 1, characterized in that the control unit of the magnitude of the closure time is made on two-input logic elements OR and AND-NOT and three-input logic element AND-NOT, and both inputs of two-input logic elements OR and AND-NOT are connected to the outputs of recorders circuit, and the outputs of these logic elements are connected to two inputs of the three-input logic element "AND-NOT, the third input of which is connected to the output of the generator of control pulses. Sources of information taken into account in the examination 1. USSR author's certificate No. 441529, cl. G 05В 23/02, 1971. 2. USSR author's certificate number 391629, cl. H 01 H 49/00, 1969. .w g /