SU397752A1 - DEVICE FOR THE CONTROL OF PHYSICAL VALUES - Google Patents

Description

I

The proposed device relates to automation and can be used to automatically control and regulate physical factors, such as temperature.

A device is known for controlling physically available quantities, containing a measuring bridge, one of whose arms includes a sensor, a bridge power supply, an imbalance amplifier in the bridge diagonal, and an executive relay connected to the amplifier output with an output contact signaling that it is saturated; 1 . physical quantities.

The drawback of the device is its: i.e. reliability, since it is possible to issue a false command if the device fails.

The proposed device allows to obtain a more reliable result due to the fact that a self-control circuit containing two control relays, a power source of the self-control circuit and two imbalance resistors have been introduced into it. One of the resistors is connected to one of the bridge arms through a serially connected normally closed contact of the first control relay and the normally closed contact of the second control relay. The other resistor is connected to the opposite arm of the bridge through a series-connected ororm.no open contact of the first control relay and normaly malio z.mugyuty

ABOUT

contact of the second control relay. The first control relay is connected to the source; 1; 1x of the power supply circuit of the self-control through the parallel-connected 10p malpo open contacts of the output and the first control relay, the second control relay connected to the power source through the subsequent connected the executive relay and normally

0 open contact the performer of the 1st relay and the normal open contact of the first control relay and connected in parallel with the normally closed relay of the second control relay.

five

The auto-controler scheme allows for automatic verification of the control device before it is operated, which means that the control is reliable.

Diagram of the device depicted: -ia drawing.

The device contains a measuring bridge 1 with a sensor 2, the power source of the bridge. unbalance amplifier 4, executive relay 5 with pins 6, 7, 8, resistors smashed; 1sa 9 and 10, first control relay // with contacts 12, 13, 14, second relay control / 5 with contacts 16, 17, 18 and power supply 19 self-control circuit.

In the initial state, the state of KOilTpol f: 1 zic: - .: their ROLYCHINS is de-energized. The imbalance resistor 9 is included in one of the shoulders of the bridge /

0

through contact 13 of the opposing relay // and contact 17 of the control relay 15. The executive relay 5 is de-energized. The contacts 6 and 8 are open and the contact 7 is closed.

After submitting the device works as follows.

From the diagonal of the bridge / - resistor 9 - IKI, the inrush of the imbalance 4 unbalances the input of such a polarity and magnitude that the output voltage of the amplifier becomes the load voltage of the relay; Relay 5. contact 6 and the contact 7 is opened. At the power supply circuit of the power supply circuit 19, the self-control circuit is fed to the control relay 11 via the contact 6 of the relay 5. The relay 7 / is activated and self-blocked by contact 12.

Contact 14 of relay 11 prepares a trigger for relay 15, which does not work, since at that time contact 7 of relay is 5 times. Pin 13 of the relay 11 disconnects the unbalance resistor .9 from bridge 1 and connects the resistor broke) 1sa 10 into the opposite arm of the bridge. the imbalance changes the field, the output of the amplifier 4 decreases the voltage to zero, the relay 5 de-energizes its contact 7. The contact 5 of the relay 5 and the contact 14 of the relay gives power to the relay 15, which operates and its.m. m 16 sa.mloblokirovat. The contact 17 of the relay 15 disconnects the resistors 9, 10 from the bridge 1, the contact 16 of the relay 15 closes, which indicates the device is working and ready for operation.

At this point, the self-monitoring process ends and the device controls the physical quantity.

When the monitored quantity of the specified overmount 1, determined by the parameters of bridge 1, is exceeded, relay 5 is activated, its closure 8 closes, which signals that the physical quantity is out of tolerance.

And p. D ete. Invented and

A device for controlling physical, for example, temperature, containing a measuring bridge, one of whose arms includes a sensor, a bridge power supply, an imbalance amplifier in the bridge and an operating relay with an output contact, connected to the output of the amplifier, different In order to increase the reliability and control of the device, a self-control circuit is inserted in the device containing two control relays, a self-supply circuit power source: a trol and two imbalance resistors, one of which is connected to one of the arms of the bridge through the follower The o-connected normally closed contact of the first control relay and the normally closed contact of the second control relay, and the second connected to the opposite arm of the bridge through the serially connected nor.m. disconnected contact of the first control relay and the normally closed contact of the second control relay , the first control relay is connected to the power source of the self-control circuit through parallel connected normally open contacts of the executive and first control relays, the second control relay is KEY TO istochnnku supply via series connected normally open contact and relays isnolnntelyshgo nor.malno open contact of the first control relay and connected in parallel with the NO contact ni.mi nor.malno second control relay.