What is a time delay relay?
Time relay refers to time-release relays whose output circuit needs a specified accurate time to produce jump change (or contact action) after adding (or removing) the input action signal. It is an electrical component used in circuits with low voltage or small current to connect or cut off circuits with high voltage and large current.
Time relay is a very important component in electrical control system. In many control systems, time relay needs to be used to realize time-delay control. Time relay is an automatic control electric appliance which uses electromagnetic principle or mechanical action principle to delay contact closing or breaking. The utility model is characterized in that there is a time delay from the signal obtained by the suction coil to the action of the contact. Time relay is generally used for motor starting process control as a function of time.
The main function of time relay is as an executive device in simple program control. When it receives the start signal, it starts timing. After timing, its working contact will open or close, so as to promote the subsequent circuit work. Generally speaking, the delay performance of time relay can be adjusted within the design range, so as to facilitate the adjustment of its delay time. I'm afraid that only one time relay can't start delay closing. After closing for a period of time, it can be disconnected. First, it can realize delay closing and then delay disconnection. However, generally speaking, it can be achieved by configuring a certain number of time relays and intermediate relays.
With the development of electronic technology, electronic time relay has become the mainstream product in time relay. The electronic intelligent digital display time relay using large-scale integrated circuit technology has a variety of working modes, which can not only realize long delay time, but also have high delay precision, small volume, convenient adjustment and long service life, it makes the control system more simple and reliable.
When selecting the time relay, pay attention to the current type and voltage level of its coil (or power supply), and select the delay mode, contact form, delay accuracy and installation mode according to the control requirements.
Wiring method editing and broadcasting
Time relay is a very important component in the electrical control system. It is generally divided into two types: power on delay and power off delay. From the principle of action, there are electronic, mechanical, etc. The electronic type adopts the principle of capacitor charging and discharging and then cooperating with electronic components to realize delay action. There are many mechanical styles, including air bag type using air bag and spring.
Wiring method of Time-delay relays:
1. Control wiring: consider it as a DC relay;
2. Work control: Although the control voltage is connected, whether it plays a control role is determined by the timer on the panel;
3. Functional understanding: it is a switch, SPDT, with a movable point movable arm, just like the movable knife arm of a common knife switch;
4: Load wiring: the zero line or negative pole of the power supply is connected to the zero line or negative terminal of the electrical appliance;
5. Working principle: when the timing is invalid, it is equivalent to the off state of the ordinary light switch. When it is effective, the relay acts and the electric appliance is powered on, which is equivalent to the normal on state of the electric light switch.
Selection of time relay:
The selection of time relay is mainly about the delay mode and parameter coordination. The following aspects should be considered when selecting.
(1) Selection of delay mode. The time relay has two types: power on delay or power off delay, which shall be selected according to the requirements of the control circuit. The reset time after the action is longer than the inherent action time to avoid misoperation or even no delay, which is particularly important in the case of repeated delay circuit and frequent operation.
(2) Type selection. Electromagnetic or air damping time relay with low price is generally used in occasions where the delay accuracy is not required; On the contrary, electronic time relay can be used in occasions requiring high delay accuracy.
(3) Coil voltage selection. Select the voltage of the suction coil of the time relay according to the voltage of the control circuit.
(4) Selection of power parameter changes. When the power supply voltage fluctuates greatly, it is better to use air damping type or electric time relay than transistor type. When the power supply frequency fluctuates greatly, it is not suitable to use electric time relay. When the temperature changes greatly, it is not suitable to use air damping type time relay.
(5) Brand selection: FBelec provides a series of time relay products with wide range, strong function and high precision. Time relay enables simple automation cycle to be established through wiring logic and can also be used to supplement the functions of PLC
