Timer Relay

Manhua Electric: Your Professional Timer Relay Supplier!

Our staffs of Manhua Electric have over thirty years of experience in the production and export of electrical products. Our main products include switchboards, automatic transfer switches (ATS), circuit breakers, contactors, lightning arresters, photocells and timers. Starting in 2017, we started operating a warehousing center in Chicago, USA. As a supplier of United Nations tender projects, we have been participating in power construction projects in overseas markets.

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What is Timer Relay?

A timer relay is a control relay with a built-in time delay function, also called a time-delay relay or timer relay. It's a combination of an electromechanical output relay and a control circuit, allows users to open or close contacts based on a specified timing function. It opens or closes contacts after a pre-determined amount of time has elapsed, thereby providing a timed control function.

Features of Timer Relay

Clear Screen

Our timing relay is equipped with a clear LCD display, which can directly display the current mode and parameters, and supports data upload and parameter setting.

Pause Function

These relays have a pause function that displays the time when the terminal is paused and automatically stores real-time data before the battery is exhausted.

Stable Operation

Their casings are equipped with industrial-grade chips that enable accurate timing switching of circuits and resist surrounding interference.

Less Maintenance

These relays use copper galvanized pins, which are rust-free and have better electrical conductivity. Their hidden dip switches also protect against dust and accidental touches.

Application of Timer Relay

Controlling Electricity Outlets

You can manage an electricity outlet by using relays to show the flow of electricity on and off. One relay controls “On” while plugging something into the outlet. Even as any other turns it off after something is plugged in. And finishes charging or powering something tool.

Activating Lighting Fixtures

One very common use for a relay with a timer is popping lighting fixtures on and off. The technique works by turning the relay’s coil on for a sure quantity of time to set off it earlier than preventing electricity flow so that lighting fixtures can flip off once more once they have been activated. This is ideal if you need your lighting fixtures to exit mechanically while nobody is in the room!

Controlling Different Machines

Some machines are managed through strength to use the time delay relay. You should manage a system on your property, like an AC or heater, without strolling throughout their dwelling room. There are limitless opportunities for what sort of automation you may do with the time delay relay.

High-Performance Programs

These devices are regularly located in high-overall performance programs, including robotics or equipment that require precision timing operations. Some examples consist of their usage to set off valves in pneumatic cylinders, control timers on espresso makers, light structures at airports & education stations, or even power up surveillance cameras.

Light Control

In conjunction with every different, time-delay relays offer a steady frequency on/off pulsing of contacts to transfer intermittent electricity to a lamp.

Furnace Protection

The air fan has to function for a described amount of seconds to “purge” the furnace chamber of any. In all likelihood, flammable or explosive vapors earlier than a combustion-kind furnace may be lit securely. A time delay relay gives this wanted time factor for the furnace management logic.

Types of Timer Relay

On Delay Timer Relay

The on-delay time delay relay is the most common type of time relay. As the name suggests, this type of relay will start the timing action when an input voltage is applied, and energize the output after the set timing. In order to de-energize the output, this input voltage must be removed, after which the on time delay relay will reset.
On-delay time delay relays are used in applications where it is necessary to ensure that a certain process has taken place before starting another process. For example, you may use an on-delay timer in a conveyor belt application to make sure that the belt is up to speed before starting the next process.
Other common uses:
●Blower motors where are the on delay timing relay is used to delay the blower’s startup.
●Burglar alarms that need to delay the sounding of the alarm to allow authorized persons time to leave the premises.
●In industrial systems to stagger the startup of large motors so that the power supply is not overloaded.
●To operate door locks that must wait a few seconds after the power is applied to make sure that the door is closed before locking it.
●In fan controls, the on delay timer relay is used to make sure that the fan has come up to speed before energizing the blower.

Off Delay Timer Relay

The off-delay time delay relay is the second most common type of time delay relay. This type of timer relay requires a trigger to start timing after it has received an input voltage. Its output will, therefore, be energized upon the application of the trigger, after which the trigger is removed so the timing can start.
After the set timing duration, the output will de-energize. The off-delay time delay relays fit into applications where it is necessary to ensure that a certain process has taken place before stopping another process. An example is when you need to make sure a motor has cooled down before stopping it.
Here are applications:
●Elevator doors that must close after a certain amount of time.
●Coin-operated appliances such as washers and dryers that must turn off after a certain amount of time.
●Air conditioners that must turn off after a certain amount of time has elapsed.
●In gas control systems to prevent dangerous situations such as gas leaks.

One Shot Timer Relay

Also called interval-on-operate time relay, the one-shot time delay relay is a type of time delay relay that triggers only once. The output when using this type of time relay is already energized when input power is applied.
The countdown, therefore, starts when the input voltage is applied, after which the output will de-energize. The operation of the one shot timer relay makes it suitable for a variety of systems and processes, including industrial ones.
Here are applications：
●Burglar alarms where the timer relay allows authorized persons time to enter rooms and deactivate the security system without the alarm sounding.
●Dispensing equipment use one shot timers to dispense the correct amounts of a product.
●In industrial applications where a machine must be started and stopped at specific times
●The one shot timer relay is also used in welding machines to allow time adjustments for spot welding.

Recycle Timer Relay

Also known as a repeat cycle timer, a recycle time delay relay turns on and off at regular intervals. These types of relays are often used in applications where it is required to cycle power to a device or electrical system. One common use for repeat cycle time delay relays is in HVAC systems. In this application, the time relay turns on the compressor and then off again at regular intervals. This helps to prevent the system from overheating.
The applications:
●In sprinklers to cycle the times when
●Pump controls to cycle the pump and prevent it from overheating.
●In electrical equipment systems where it is necessary to turn the device on and off at specific intervals.

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Flasher Timer Relay

In a flasher timer relay, the contacts keep energizing and de-energizing at regular intervals. This is usually after the application of an input voltage. These types of time delay relays are often used in applications where it is necessary to indicate that a system or process is working.
One common use for a flasher timer is in emergency lighting systems where the light must flash at regular intervals to indicate that the system is working.
The applications:
●As an indicator in a process control system
●To indicate that a device is turned on
●In traffic signals

Function and Fundamentals of Timer Relays

Relays instruct electrical and electronic devices and machines to activate. We rely on relays to activate a multitude of appliances, machinery, and equipment ranging from motor vehicles to cell phones to furnace fans and conveyor belts. Time relays have a time-delay function built in. Triggered in different ways, time delay relays can minimize the amount of energy used to start large industrial machinery or to switch lights or machines on and off at specified times. They can also be used to ensure that different parts of a machine start separately at predetermined times, such as:

Production
Time relays may be used to control loads or production processes in a variety of ways. For instance, a time delay relay can ensure that items move from one conveyor to another when required to prevent items on a conveyor belt piling up on top of each other.

Safety
As a safety application example, furnaces or other combustion chambers require ventilation is needed to get rid of fumes and avoid the possibility of explosions. A time delay relay can provide a scheduled window to clear noxious gases from the chamber.
Typically, a time delay relay is triggered either by opening or closing a circuit or by providing an input current. The trigger signal may be designed with either a dry-contact control switch, such as a float switch, limit switch, or push button; or with voltage. However, there are multiple types of time delay relays and their timing functions operate differently.

Working Steps of Time Relays?

Let’s now see how a timer relay works. A time relay is used to control an event based on time. The time delay can be set by the user, and once it has been activated, the relay will wait the specified amount of time before executing the event. The event can be anything that the relay is designed to do, like opening or closing a circuit, turning on or off a device, etc. Here is the timer relay working principle.

(1)A time relay uses an electromagnet to operate a set of contacts, or it may be a solid state time relay and use semiconductors (electronic circuitry).

(2)When the time relay is activated, the electromagnet is energized, and the contacts are closed.

(3)Once the time delay has elapsed, the relay will carry out the event and then return to its original state, waiting to be activated again.

(4)After a pre-determined amount of time has elapsed, the electromagnet is de-energized, and the contacts are opened. The time relay delay is usually adjustable. There are also timed relays that allow users to set multiple functions, such as different timed events.

Using Benefits of Timer Relay

Delayed Start

Timer relays in motor controls have a primary purpose, to enable a delayed start. In situations where it's necessary for a motor to experience a brief delay before activation, these timer relays prove invaluable.

Control of Time-Critical Operations

Timer relays ensure accurate operations for specific duration in various applications. For instance, conveyor systems, they can effectively control the duration of product exposure to a particular process.

Safety Measures

Timer relays play a crucial role in enhancing safety in motor control systems. They are utilized to introduce a time delay before shutting down a motor in the event of an emergency or fault detection. This delay creates a critical window for implementing necessary corrective actions.

Preventing Motor Overloads

Motor overloads can cause damage and result in downtime. To prevent overheating and extend the motor's lifespan, one effective solution is the use of timer relays. These relays enable the implementation of cool down periods between motor cycles.

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Sequential Control

In complex motor control systems, where numerous operations need to occur sequentially, timer relays ensures seamless alignment between each step in the process and the subsequent one.

Delay Devices of Timer Relay

Thermostatic relay

One of the connections is a bimetallic element wrapped in an isolated heating coil in this variant of a time delay arrangement. The heating coil is given the signal strength. The delay time is the amount of time it takes to elevate the contact temperature to a point where deformation occurs, causing the contact to transfer.

Standard thermostatic time delay relays have a time tolerance (precise) of just 20%, although customized designs can have greater tolerances. These units are similarly only around 5% repeatable, but they are cheap and naturally resistant to transients.

Motor-Driven

Asynchronous motor is used to power this relay type. A basic train of machine-cut straight gears is used to propel a firing arm. The arm triggers a rapid action switch, with the delay period determined by the motor speed and gear reduction.

An electromagnetic coil clutches and disengages the trigger lock gear as needed, allowing the reset to happen instantly. A series of auxiliary contacts are frequently included with the clutch coil. The motor circuit receives power, whereas the clutch coil receives signal power.

The clutch coil controls the instance contacts, while the trip arm controls timed contacts. The delay in power interruption rises as clutch power is maintained. To put it another way, the relay accumulates as long as the motor is powered on until it reaches the predetermined time of the delay relay.

The use of an asynchronous motor ensures great precision and, when coupled with the suitable gear, allows for highly long delays of hundreds of hours. A progress indicator is sometimes included with these relays.

Factors to Consider When Choose Timer Relay

If you have a basic circuit, then you may just need one timing range; if the circuit is more complex, then several delay settings may be required. The timer relay will have a minimum and maximum time limit, and these should be within satisfactory operating levels. Timers on this relay may come in either digital or analog styles. On-delay and off-delay features help run the relay when you are not around.

A basic relay will have just one timing range, meaning you can set the relay to open every five seconds, for example. Complex circuits may require several ranges; if there are two ranges, then you can set the circuit to open in alternating patterns of five seconds then three seconds. You should check the circuit to see how many ranges it will require for proper use.

Most timer relay devices have a minimum and maximum time limit, and you cannot set a lower or higher time than these limits. The common range is about 0.01 to 0.05 seconds for the minimum, and about 50 to 100 hours for the maximum. If your circuit needs a shorter or longer time, then check the relay’s specs to ensure it fits within your requirements.

Normally a timer relay has a clock face that allows you to set the relay times, and this face comes as either digital or analog. While this is normally a matter of preference, each relay face has its own purpose. A digital face makes it easier to set exact times, especially for very short or long time limits, while an analog face is typically less expensive and it may be easier to set for medium time limits.

A majority of timer relay devices have on-delay and off-delay functions to automate the relay’s use. For example, on-delay allows you to specify when the device will turn on; if you leave the relay alone, but it needs to start working in several hours, the delay will allow it to work without you coming back to the relay. While it is possible to use a relay without these functions, you may forget to turn the relay on or off, which can have bad effects for whatever the circuit controls. This means that getting a relay with one or both of these features is usually desirable.

What You Should Know When Use Timer Relay

Starting Point

On the one hand, you should choose to power up the time relay when the control circuit that needs to execute timing sends the timing signal when choosing the timing point of the power-on delay time relay. On the other hand, when choosing the timing point of a power-off delay type time relay, you should decide to turn off the time relay’s power supply when the control circuit needs to transmit the timing signal so that the timing can be carried out.

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End Point

The timing endpoint has two definitions: one relates to the moment when the set time and timing time are equal, and the other refers to the time when the contract begins to take effect.

Reset Point

The time relay must be reset in order to clear the previous timing data for the subsequent use. The following time it is used, if it is not reset, an anomaly will happen. The duration between two uses should be longer than the reset time, which is especially crucial for electric time relays.

The Relation Between the Points

There is a reset issue after the time relay is utilised. By the time the relay outputs, the majority of the control circuits are in the circuit at the next level. The time relay’s power supply can be turned off (power-on delay type) or powered once the timing completion signal has been precisely obtained (power-off delay type). The time relay’s upper and lower control circuits contain components that cannot operate simultaneously. The gadget will behave strangely if the time relay is unable to precisely operate the upper and lower control circuits at these points.

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Frequently Asked Questions of Timer Relay

Q: What is a timer relay used for?

A: A timer relay is a device that opens or closes a circuit after a set amount of time. They are usually electromechanical and can be used in a variety of electrical systems and devices. Timer relays can be used for many purposes, including delaying the energizing or de-energizing of a circuit, controlling power outlets, activating lights, starting a motor, controlling an electrical load and so on.

Q: Where are timing relays used?

A: Timing relays are commonly used in a variety of industrial and commercial applications. Some common applications include machines, buildings, water segments, HVAC, and other applications. Some examples of their use include:
Flashing light control (time on, time off).
Engine auto start control.
Furnace safety purge control.
Motor soft-start delay control.
Conveyor belt sequence delay.

Q: How does an interval timer relay work?

A: Electromagnetism is the timer relay working principle. One relay coil is always on, while the other can be turned off and on with an electric signal sent through it from a control device such as a phone or computer system. The “on” coil receives power all the time, making it ready to activate at a moment's notice. When the control input is energized, the relay contacts immediately transfer. They will transfer back to their normal position at the end of the timing period. The control input must de-energize to reset the timer.

Q: What is a recycle timer relay?

A: A recycle timer relay, also known as a repeat cycle timer, duty cycling, or cycle timer, is a device that turns on and off at regular intervals. They conserve energy by turning a load off and on at regular intervals, and can offer precise feedback and event activation. Electronic timers trigger the pre-set time interval and transmit an output signal to the linked equipment to start pre-programmed events like alarms and on/off switching.

Q: What is the most commonly used timing relay?

A: Various types are available, but the most common, called “delay on make”, will energize the coil a set time period after power is applied to the relay. Similarly, a “delay on break” type holds the coil in for a time after the power is removed from the relay. Also, the industrial time delay relay is also one of the most common types used in manufacturing and other industrial applications. These devices are used to control the timing of conveyor belts, production lines, and other machinery.

Q: Why use a time delay relay?

A: There are various time delay relays, each with specific uses. Some common applications for time delay relays include controlling the start and stop of machines, controlling the on and off cycling of a load, and delaying the activation of a circuit. They are useful in implementing control logic with electronic control systems. Time delay relay helps to set delay time from a few seconds to even hours. Energy saving is possible.

Q: What is the difference between a timer relay and a relay?

A: Timing relays are similar to other relays in that they too use a coil to control the operation of contacts. The primary difference between a control relay and a timing relay is that the contacts of the timing relay delay changing their position when the coil is energized or de-energized. On a conventional Control Relay, the contacts are opened or closed when a voltage is applied and removed from the coil, however, for timer relays the contacts will open or close before or after an intentional time period.

Q: Can a relay be constantly on?

A: Yes, a relay can be constantly on. Many relays in industrial settings are continuously energized year-round, except during maintenance or emergency shutdowns. As long as you don't exceed the relay's voltage rating or voltage, it can be left on indefinitely. Keeping a relay constantly energized doesn't wear it out. However, keeping a relay in a constant on state can cause the coil to heat up and get damaged. This is unlikely, but will only happen if you have a low quality relay or apply excess current.

Q: Does a relay need a switch?

A: You are correct that a relay is basically just a switch, but it's a switch operated via remote control, so to speak. A regular switch controls electrical current by connecting or breaking the path of either the positive side of a circuit (most common) or the negative side of a circuit. A relay's internal mechanical switching mechanism (contacts) use an electromagnet (coil) to operate. When a relay contact is open, the coil is activated, which switches power on for a circuit.

Q: What are the three basic functions of a relay?

A: It is actually an "automatic switch" that uses a smaller current to control a larger current. Relay plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems.

Q: What are the three major parts of a contactor or relay?

A: A contactor or relay will have a coil (to develop a magnetic field when energized), an armature (which is attracted by the electromagnetic coil when energized), and then contacts (which are attached to the armature, and close when the coil energizes).

Q: What is a time delay based relay operated load?

A: A time delay based relay is a relay that stays on for a certain period of time once activated. This circuit is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to few seconds but can be increased by increasing the time constant of the mono-stable 555-timer.

Q: How is a time relay wired?

A: Pin 30 is the power supply for a relay, and pin 86 acts as the switch for that pin. 85 is the grounding pin and 87 is the pin connected to a device. When the power is switched on through pin 86, the circuit is closed, and the power source is connected through pin 30. This current then powers the device connected to 87.J

Q: Can a time relay be used for both AC and DC applications?

A: Yes, a time relay can be used for both AC and DC applications. A relay is a switch that is electrically operated and is typically used to control a high-power or high-voltage circuit with a low-power signal. The relay contacts can switch AC or DC since they are completely isolated from the coil as long as the relay coil is driven to its specified voltage and waveform.

Q: Is it possible to adjust the time delay on a time relay?

A: Yes, you can adjust the time delay on a time delay relay (TDR). In many cases, you can adjust the delay time by turning a knob. You can also change the set time delay by modifying the time adjustment potentiometer. TDRs are a combination of an electromechanical output relay and a control circuit. The control circuit includes solid state components and timing circuits that control the relay's operation and timing range.

Q: What is the accuracy of a time relay?

A: Timer calibration can be used to define the length of a second, as seen by the timer. By lowering the timer calibration value, the timer can be accelerated. Since relay timers are derived from the system clock, it would stand to reason that relay timers maintain a 3% accuracy.

Q: What is the difference between a solid-state relay and a relay?

A: Solid-state relays normally have only one output contact, while electromechanical relays can multiple output contacts. A solid-state output has no moving parts and can last longer, but can only handle small loads. Relay outputs are relatively slow to switch states, whereas solid-state outputs are much faster to switch states. Relay outputs provide a physically-opened circuit, such that no voltage leak can occur across the open relay.

Q: What is the contact rating of a time relay?

A: Timer relay contacts are generally rated for 5 to 10amp resistive loads, and can often be supplied with solid state output contacts for lower level switching applications. Timing functions for timer relays include but are not limited to: on-delay, off-delay, and interval/one-shot modes.

Q: How do you test a time relay?

A: Check the contact status: Apply the rated voltage to the control coil to test the contact status. After a delay, check if the delay contact is closed (resistance is close to 0Ω) and disconnected (resistance is infinite).
Check the resistance: Use a digital multimeter (DMM) to test the resistance between each pole of the relay and the corresponding NC and NO contacts. All NC contacts should read 0 ohms to the corresponding pole, and all NO contacts should read infinite resistance.
Check the continuity: Use a multimeter to test the continuity of the contacts. A continuity test will confirm if the relay is closed or open.
Check the coil: Use a multimeter to test the resistance of the coil. A resistance test will confirm if the coil is burned out or not.
Check the click test: Run a couple wires from the battery to the control circuit pins 85 and 86. If the relay clicks, it's working. If it doesn't click, the relay is probably bad.

Q: What are the safety precautions that need to be taken while working with a time relay?

A: Use that exceeds the specification ranges such as the coil rating, contact rating and switching life should be absolutely avoided. Doing so may lead to abnormal heating, smoke, and fire. Never touch live parts when power is applied to the relay. Always disconnect power, use insulated tools, wear protective gear, follow wiring procedures, test for live circuits, use circuit breakers, and obtain proper training.

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