Delay on break timers are used in various industrial applications to prevent equipment failure and improve safety. These timers are designed to delay the opening of a contact in a control circuit after the control voltage is removed. This delay is important to allow for the safe shutdown of equipment and prevent damage to electrical components. In this article, we will discuss the wiring diagram for a delay on break timer and its importance in industrial settings.
What is a delay on break timer?
A delay on break timer is an electrical device that is used to delay the opening of a contact in a control circuit after the control voltage is removed. This delay is typically adjustable and can range from a few seconds to minutes. The purpose of the delay is to allow for the safe shutdown of equipment and prevent damage to electrical components. Delay on break timers are commonly used in HVAC, refrigeration, and process control applications where equipment shutdown is critical.
Delay on break timers are available in various configurations, including electromechanical and solid-state. Electromechanical timers use a mechanical mechanism to provide the delay, while solid-state timers use electronic components such as transistors to achieve the delay. Both types of timers have their advantages and disadvantages, and the selection of the appropriate timer depends on the application requirements and environment.
Wiring diagram for a delay on break timer
The wiring diagram for a delay on break timer consists of several components, including the timer relay, control voltage source, load device, and control devices such as switches or contacts. The wiring diagram may vary depending on the specific application requirements and timer type. However, the following is a general wiring diagram for a delay on break timer:
| Terminal | Description |
|---|---|
| 1 | Control voltage input (+) |
| 2 | Control voltage input (-) |
| 3 | Load device input (+) |
| 4 | Load device input (-) |
| 5 | Normally open (NO) contact |
| 6 | Common (COM) contact |
| 7 | Normally closed (NC) contact |
| 8 | Delay adjustment |
The control voltage source is connected to terminals 1 and 2 of the timer relay, while the load device is connected to terminals 3 and 4. The control signal from the control device is connected to the normally open (NO) contact of the timer relay, and the load device is connected to the normally closed (NC) contact. When the control voltage is removed, the timer relay is energized, and the NO contact is closed. This maintains power to the load device for a set period determined by the delay adjustment. After the delay period, the timer relay opens the NO contact, and the load device is de-energized.
The delay adjustment is used to set the delay period for the timer relay. This can be adjusted using a screwdriver or a knob, depending on the timer type. Typically, the delay period is indicated in seconds or minutes on the timer relay.
FAQ
What is the purpose of a delay on break timer?
The purpose of a delay on break timer is to delay the opening of a contact in a control circuit after the control voltage is removed. This delay allows for the safe shutdown of equipment and prevents damage to electrical components.
What types of applications use delay on break timers?
Delay on break timers are commonly used in HVAC, refrigeration, and process control applications where equipment shutdown is critical. These timers are also used in industrial applications such as conveyor systems, pumps, and compressors.
What are the advantages of using a solid-state delay on break timer?
Solid-state delay on break timers offer several advantages over electromechanical timers, including faster response times, higher accuracy, and greater reliability. Solid-state timers also have no moving parts, making them less prone to mechanical failure.
What factors should I consider when selecting a delay on break timer?
When selecting a delay on break timer, consider the application requirements, including the delay time, control voltage, load type, and environment. It is also important to consider the timer type, such as electromechanical or solid-state, and the manufacturer’s specifications to ensure compatibility with the application.
