First pre ss the "Cancel/Resume" button of the timer to unlock the screen, then pre ss the "Calibration" button to calibrate the hour, "Calibration" button to proofread the minutes, and the "Correct Weekly" button to proofread the day of the week.

Door light timer: It is a controller that can control the door light (luminous letters) to automatically turn on and off at a scheduled time. There are many names on the market, such as timer switch, time control switch, timer, and timer. Controllers, etc., the adjustment methods are basically the same.

The relatively new door headlight timer currently on the market is the Bluetooth timer, which is an upgrade based on the push-button timer. It adds a Bluetooth connection module, and the Bluetooth is connected to the mobile phone, with a range of 15 meters. The switch is wirelessly controlled through the WeChat applet. Up to 30 groups of on and off can be set, which can be accurate to the second. It has a power-off memory function.

Illuminated character timer: A controller that controls the automatic timing on and off of door heads, signboards, luminous characters, light boxes, etc., whether it is a luminous character timer, door headlight timer, billboard timer, Advertising word controllers are the same type of products, with different names and basically the same usage methods.

What are the types of door headlight timers?

The types of door headlight timers include on-delay timers and off-delay timers. Timers, hold-on delay timers and pulse timers, etc.

The working principle of the time relay: The time relay is a control appliance that uses electromagnetic principles or mechanical principles to achieve delay control. When the coil is energized, the armature and the supporting plate are attracted by the iron core and move downward instantaneously, causing the instantaneous action contact to be connected or disconnected.

However, the piston rod and the lever cannot fall together with the armature at the same time, because the upper end of the piston rod is connected to the rubber membrane in the air chamber. When the piston rod starts to move downward under the action of the release spring, the rubber membrane As it concave downwards, the air in the upper air chamber becomes thinner and the piston rod is dampened and slowly descends.

After a certain period of time, the piston rod drops to a certain position, and the delay contact action is pushed through the lever, causing the moving contact to open and the moving contact to close. The time from when the coil is energized to when the delay contact completes its action is the delay time of the relay. The length of the delay time can be changed by adjusting the size of the air chamber inlet hole with a screw. After the attraction coil is deenergized, the relay recovers by the action of the recovery spring.

Time relay wiring diagram

1. Control wiring: Think of it as a DC relay. 3 and 7 are used to connect to 12V control voltage; 2 and 7 are used to connect to 24V control voltage. 7 of them is used as the negative pole of DC power and is connected to the neutral line when in use. 2 Connect to the 220V live wire.

2. Work control: Although the control voltage is connected, whether it takes control is determined by the timer on the panel.

3. Functional understanding: It is a switch, single pole double throw, with an active point movable arm, just like the movable arm of a common knife switch. 8 is the active point and 5 is the normally closed point. When the relay does not move, the two of them are connected. When moving, 8 and 6 are connected.

4. Load wiring: The neutral line or negative terminal of the power supply is connected to the neutral wire or negative terminal of the electrical appliance. The live wire or positive terminal of the power supply is connected to pin 8, the live wire or positive terminal of the electrical appliance is connected to pin 6, and pin 5 is left idle.

5. Working principle: During the timer invalid period, 8 and 5 are connected, which is equivalent to our normal light switch off state. When it is effective, the relay operates, 8 and 6 are connected, and the electrical power of the appliance is used, which is equivalent to the on state of our ordinary light switch.

Extended information

Types of time relays:

1. Air damping time relay: also known as air bag Type time relay, which delays based on the resistance generated by air compre ssion. It has a simple structure, is cheap, and has a large delay range (0.4~180s), but the delay accuracy is low.

2. Electromagnetic time relay: The delay time is short (0.3~1.6s), but its structure is relatively simple. It is usually used in power-off delay occasions and DC circuits.

3. Electric time relay: The principle is similar to that of a clock. It uses an internal motor to drive a reduction gear to rotate to obtain a delay. This kind of relay has high delay accuracy and wide delay range (0.4~72h), but its structure is complicated and the price is very expensive.

4. Transistor time relay: Also known as electronic time relay, it uses a delay circuit to delay. This relay has high pre cision and small size.

Reference source: Baidu Encyclopedia-Time Relay