PM4HF11R-S-AC120VW

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Time Delay Relays are a class of electrical relays which are used to delay the mechanisms of an electrical device or system by a certain amount of time. The PM4HF11R-S-AC120VW is one such time delay relay which is used in various industrial and commercial applications and it is important to have a basic understanding on its working principle.

The PM4HF11R-S-AC120VW is an off-delay type of time delay relay and this means that its time delay period starts when it is turned off. It is powered with an AC voltage of 120V and rated current of 3A. It has a 24 hour timing range and the contacts are rated as normally open or normally closed. The time delay period can be adjusted by the front knob in the range 0.1 to 10 seconds.

This time delay relay is used in many industrial and commercial applications. In the HVAC industry, it is used for the control of fan coil units to permit the fan to run for a period after the compressor is shut off. This helps in clearing warm air from the heat exchanger before the fan is shut off, thus preventing compressor damage due to overheating. In the manufacturing industry, it is used for the control of automated circuit breaker systems to ensure the breaker adequately clears the circuit before switching off. It is also used for the control of heavy machinery in automated manufacturing processes to enable it to shut off and switch over to another machining program after a pre-determined period.

The PM4HF11R-S-AC120VW works using an internal oscillator and solid-state switch. Upon receiving a momentary input, the internal oscillator energizes the relay coil and the contacts assume the position dictated by the control voltage. The internal solid state switch then triggers the internal timer. The timer starts counting the delay time in 1 second increments. At the end of the delay time, the timer triggers the output switch to the set position, assuming the input signal is still present. At the same time the relay coil is de-energized and the contacts move back to their de-energized position. If the input signal is removed before the delay time runs out, the output switch is triggered to the position corresponding to the input voltage.

In summary, the PM4HF11R-S-AC120VW is a time delay relay which is widely used in the industrial and commercial sectors. It is an off-delay time delay relay and is triggered when it is switched off. It has a 24 hour timing range and the delay time can be adjusted by the front knob in the range 0.1 to 10 seconds. It works by using an internal oscillator and a solid-state switch and is used in various applications including the control of fan coil units, automated circuit breaker systems and heavy machinery in automated manufacturing processes.

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