Relay No Nc

Posted on Apr 16, 2018 by Winifred E. Torres
Relay No Nc ~ This is images about relay no nc posted by Winifred E. Torres in Relay category on Apr 16, 2018. You can also find other images like wiring diagram, parts diagram, replacement parts, electrical diagram, repair manuals, engine diagram, engine scheme, wiring harness, fuse box, vacuum diagram, timing belt, timing chain, brakes diagram, transmission diagram, and engine problems.
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Figure 18.19 Relay symbols for n.o., n.c. contacts, and relay coil. EXAMPLE 18.2: Combinatorial circuit The combinatorial circuit of Figure 18.13 can be represented by a ladder diagram (Figure 18.20). All of the conditions have to be satisfied simultaneously. The series connection is a logical AND and the parallel connection a logical OR. The lower case characters (u , y) denote the switches and the capital symbols (Y; the ring symbol) denote the coil. The relay contacts usually have It is important because some alarm switches are available with either an NO or an NC contact but not with both, and therefore without the NONC option in the logic module two types of logic modules would be required. The logic module is converted for use

with. The logic module of relaytype annunciators may have spare (electrically isolated) auxiliary contacts that can operate shutdown and interlock systems when alarm conditions occur. The auxiliary contacts are wired to terminal and it opens the contacts in NC relays not allowing the electrical signal to pass through. NO relays function as discrete signal buffers or signal repeaters while NC relays function as signal inverters. These relays basically repeat the discrete/digital input signal with or without inversion, depending on whether the relay is NO or NC. A generalpurpose relay with three contacts, called a changeover (CO) relay is illustrated in Figure A.3. CO relays are flexible, as they can be wired either as Figure 18.19

Relay.symbols for n.o., n.c. contacts, and relay coil. EXAMPLE 18.2: Combinatorial circuit The combinatorial circuit of Figure 18.13 can be represented by a ladder diagram (Figure 18.20). All of the conditions have to be satisfied simultaneously. The series connection is a logical AND and the parallel connection a logical OR. The lower case characters (w, y) denote the switches and the capital symbols {Y; the ring symbol) denote the coil. The relay contacts usually have 14.10.3 Push Button with NO/NC Contacts Such a push button has two sets of contacts in its mechanical assembly. In the initial condition, the push button closes a set of contacts (called normally close, or NC) and the other sets of contacts remain open (called normally

open,.or NO). When the external force is applied, the contacts change state, i.e., NC contacts are opened and NO contacts are closed. Figure 14.15 shows the design and symbol. 14.10.4 Electromagnetic Relay The  25 20 SWITCH I NO NO NC NC 10 10 30 50 10 10 10 NC NC NC NC NC II NO NC NC NC NC NC NC NC NC NC NC T = 0— FIGURE 8 3PST N.O. Relay in. FIGURE 5 DPDT DIP RELAY Applied Voltage: 24 Volts DC. (Nominal) Horizontal Scale: 50 Micro sec. cm. Cycling Frequency: 45 HZ. 85. TIME N SEC AT swn CH 0 N SEC I II 0+ 0 NC NC 10 10 T NC 30 20 T T 35 5 T NO 90 55 NO NO 100 10 NO T 105 5 T T 108 3 T NO NO NO FIGURE 6 TIME AT SWITCH DPDT DIP RELAY For a small contact, relay circuit (labelled X) the statement X = 0 means that the element is

open.and X = 1 means closed. Many switches are realized by solid state gates, but electromechanical relays are still in use in many applications. Relays remain, a necessary interface between the control electronics and powered devices. Relay circuits are either normally open (n. o.) or normally closed (n.c), where 'normally' refers to the state in which the coil is not energized. Relays can If the trouble contacts in all alarm switches in the plant are standardized such that normal operating conditions will cause all trouble contacts to be NC (or NO), the required annunciator sequence is also NC (or NO). Annunciator systems are fail safe or selfpolicing if they initiate an alarm when the logic module fails because of relay

coil.burnout. The feature is standard for most NO and NC annunciator sequences; annunciators using NC trouble contacts are also fail safe against failures The ON delay timer will begin timing when the relay coil is energized. The symbols used for the timing contacts show the normal (relay coil off) condition for each contact. When the time delay has expired, the contacts will transition states (NO contacts will close and NC contacts will TR TIMING RELAY COIL KT NO CONTACT NC CONTACT KT KT NC INSTANTANEOUS CONTACT TR TR NO INSTANTANEOUS CONTACT TIMING RELAY COIL Figure 45 Electrical symbols for the 6CYCLE 1 CYCLE 1 (3 RELAYS) TABLE ICONTACT RESISTANCE INmO VACUUM PRESSURIZED ^B2 DRY SWITCHED ^C2 OPERATIONAL TEST 1d2 FIG. 7CYCLE 2

CYCLE.2 (2 RELAYS) TABLE nCONTACT RESISTANCE IN mO > < Al Bl CI Dl STAGE FIG.9 A2 B2 C2 02 STAGE FIG.IO VACUUM PRESSURIZED OPERATIONAL TEST >B3 DRY SWITCHED lc3 FIG. 8CYCLE. 144. RELAY*! RELAYS 3ELAY*3 AVERAGE XNJ. RES STAGE NC NO NC NO NC NO NC NO 33 i 8 

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