How to Wire Spring Wound Timer with LYS Rely for ON/OFF Delay

Electrical Technology

Wiring a Spring Wound Timer with an LY2 Surface Mount Relay for ON-Delay and OFF-Delay Operations

In today’s wiring tutorial, we will demonstrate how to wire a spring-wound timer for ON-Delay or OFF-Delay operations with the help of an 8-PIN LY2 surface mount relay. As we have used a table lamp in the following circuit, you may connect any load point, keeping the following considerations in mind:

The LY2 relay is capable of handling up to 15A for single-phase loads at 120VAC.
It can handle up to 10A at 240VAC.
You can use the relay without a base to reduce its size; in that case, be sure to connect the wires with crimp terminals.
For the yellow terminals, you may use 12-10 gauge wire, and for the blue terminals, 14 gauge wire is appropriate.
The compact size of the spring-wound timer allows it to fit perfectly in a standard switch box.
Both the spring-wound timer and LY2 relay can easily fit into a dual-wide (deep) switch box due to their compact dimensions.

Spring Wound Timer

A Spring Wound Timer is a mechanical timing device that relies on the energy stored in a wound-up spring to control electrical circuits or devices. These timers are commonly used in various applications, such as lighting control, HVAC systems, and appliances. They are widely used for ON-delay or OFF-delay operation in the circuits.

When wound manually, the timer’s spring stores potential energy, which is released gradually, enabling precise timekeeping and control. Spring wound timers offer a simple and reliable way to automate processes and ensure specific time-based operations.

LY2 Relay

The LY2 Surface Mount Relay is a versatile and widely used electrical component in control and automation systems. It features both normally open (NO) and normally closed (NC) contacts, providing flexibility in control circuit configurations.

With a coil voltage typically ranging from 12V to 240V AC/DC, the LY2 relay can seamlessly integrate into different voltage environments. Its durable construction and high switching capacity make it suitable for controlling a wide range of loads, including motors, lights, and heaters.

Following are the terminals connections of LYS Relay

7 and 8: Power terminals (Phase and Neutral (AC/DC))
5 and 6: Common
3 and 4: Normally Open (NO)
1 and 2: Normally Closed (NC)
Com 5 is NC with 1 and NO with 3
Com 6 is NC with 2 and NO with 4

Wiring the Circuit

As shown in the wiring diagram, the phase wire from the 120V AC supply is connected to the spring-wound timer and the common terminal (5) of the LY2 Relay. The second wire from the timer is connected to the power terminal (L) of the relay.

The normally closed (NC) terminal of the relay is wired to the lamp.

The Neutral wire from the power supply is connected to both the table lamp and the Neutral terminal (N) of the surface-mount relay.

Working of the Circuit

When the 120V AC supply is connected to the spring-wound timer, it activates and begins counting the predefined time period. The table lamp is OFF.

Once the preset time expires, the relay coil energizes, and the normally open contacts become normally closed (the common connects with NC). As a result, the table lamp turns ON.

This configuration achieves an ON-delay mechanism, meaning that the load does not turn on immediately but instead switches ON after the delay time expires.

You can use the same configuration (except connects the table lamp to the NO (3) terminal of relay instead of NC (5) terminal) for ON-Delay mechanism to achieve an opposite action e.g. where the connected load doesn’t turn off immediately but rather switches off later when the timer reaches the set time.