Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit with low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. Relay first used in the long-distance telegraph circuits, repeating the signal coming from one circuit and re-transmitting to another circuit.
Function of Time Delay relay is a timer for controlled equipment. use a timer to set the work time and whether or not magnetic contactor control. For example, to set the time the electric motor turn left and right, changing the relationship of the triangle and set the time of his regular electric motor turns in a certain time and other.
Working principle of magnetic induction using a timer and using electronic circuits. timer with magnetic induction works like-principle the induction motor, while the electronic timer that uses the principle of having a series of R and C are connected in series and parallel, if the voltage have filled the timer relay will be connected and the long time delay based on the size of the charging capacitor. Part timer input given the output coil symbol in the form of contacts normally open and normally closed.
Fig. Time Relay Delay
Fig note :
2,7 TERMINAL AS A SOURCE SOURCE
1,3 & 6,8 TERMINAL NORMALIC OPEN
1,4 & 5,8 TERMINAL NORMALIC CLOSE
1,3 & 6,8 TERMINAL NORMALIC OPEN
1,4 & 5,8 TERMINAL NORMALIC CLOSE
TDR is a way of working (see above symbol TDR) at the legs of source (2,7) given voltage then the timer or the snooze timer circuit would work under timed conditions. When the specified time then contact NO (1,3 & 8,6) will close and the NC contacts (1,&, 8,5) will open. Long time depending on the settings and whether or not we are doing on a timer.
Time delay relay (TDR) called also Contactor timer. Contactor timer is Contactor is used as a function of time delay relays to move the work of the control circuit to a particular circuit that works automatically. Ex from star to delta (one of the electronic circuit) automatically. The principle is the same as contactors, only has a time delay surgery. This timer contactor has contacts NO and NC contacts, such as the magnetic contactor, only works based on predetermined delay time. Usually this is called timer contactor / TDR. There are kind of TDR, such as :
*TDR with Time Delay on (On Delay)
This timer works on normal with a time delay corresponding to a given setting.
For NO, after the coil of the contactor is energized, NO contact remains open until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change the status of the open (off) to be closed (on) and will remain closed for the contactor gets power supply. If the power supply is disconnected, then the contactor will re-open.
For NC, after a given supply coil of the relay, NC contacts remain closed until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change the status of the closed (off) to open (on) and will remain open during the relay gets power supply. If the power supply is disconnected, the relay will be re-covered.
This timer works on normal with a time delay corresponding to a given setting.
For NO, after the coil of the contactor is energized, NO contact remains open until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change the status of the open (off) to be closed (on) and will remain closed for the contactor gets power supply. If the power supply is disconnected, then the contactor will re-open.
For NC, after a given supply coil of the relay, NC contacts remain closed until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change the status of the closed (off) to open (on) and will remain open during the relay gets power supply. If the power supply is disconnected, the relay will be re-covered.
* TDR with Time Delay Off (Off Delay)
This timer works contrary to the On Delay timer, current and voltage contactor magnet gets active, direct contact is active as well, but after missing voltage and magnetic contactor is off, then the last active contact will become inactive after the specified time.
For NO, after the coil of the relay given supply, NO contacts will change the status to be closed and will remain closed for a given coil supply. When the power supply is disconnected, the contact will remain closed until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change status from closed to open.
For NC, after the coil of the relay given supply, the NC contact will change the status to be open and will remain open for a given coil supply. When the power supply is disconnected, the contact will remain open until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change status from open to closed.
by Angga Hidayah Ramadhan 112110088 TI-35-INT
This timer works contrary to the On Delay timer, current and voltage contactor magnet gets active, direct contact is active as well, but after missing voltage and magnetic contactor is off, then the last active contact will become inactive after the specified time.
For NO, after the coil of the relay given supply, NO contacts will change the status to be closed and will remain closed for a given coil supply. When the power supply is disconnected, the contact will remain closed until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change status from closed to open.
For NC, after the coil of the relay given supply, the NC contact will change the status to be open and will remain open for a given coil supply. When the power supply is disconnected, the contact will remain open until a certain time, for example 5 seconds. After 5 seconds, the contact will automatically change status from open to closed.
by Angga Hidayah Ramadhan 112110088 TI-35-INT
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