FA155-2 Industrial Controls

Series:	*
Part Status:	Active
Lead Free Status / RoHS Status:	--

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Time Delay Relays

Time Delay Relays are a type of electronic device specially designed to provide a delay between the application of an input signal and the output actuation. They are extensively used in a variety of industrial, commercial, automotive, and military applications and serve to automate a range of processes and tasks. This article looks closely at one of the more commonly used Time Delay Relays, the FA155-2 and examines its application field and working principle.The FA155-2 Time Delay Relay is a programmable unit designed to be used both for static and dynamic loads with a variety of delay times set by a simple thumb wheel setting. The unit has a built-in 24V AC/DC power supply, and is powered through a 2-wire input connection. It is powered by a 12V DC supply, and it can also operate off a 110V AC supply. The settings for the Time Delay Relay can be both time on and time off, as well as both delay on and delay off. The FA155-2 has a variety of applications, including process control and monitoring, motor control systems, lighting systems, material handling systems, and for interfacing with PLC systems. It is well suited for both on-site and remote applications, and with its versatile settings, it can provide time delays from as little as 4 ms to as much as 240 ms.The FA155-2 Time Delay Relay functions on the principle of timing out, with a single triac connected in series with the coil of the contactor. When an external signal is supplied to the relay, the single triac switches on and in turn acts as a timer, with the current flow through the triac creating a resistive thermal energy until a specific temperature level is reached and the current is then released. The triac then turns off and a preset time delay is thereby created. The single triac functions as a monitoring device, detecting any changes in the load current and responding accordingly to adjust the current flow. It also activates or deactivates the coil current of the contactor depending on the load applied. By monitoring the current, the triac can be used to control the time delay with respect to load changes. The main features of the FA155-2 Time Delay Relay include a programmable digital LCD display for setting time delays and time ranges, three modes of time setting, an adjustable current setting, adjustable duration time setting, and universal input configurable for either 8-24V DC or 100-240V AC. It also features a wide range of integrated vacuum pickups for varying load applications, as well as a multi-directional mounting system for an interactive connection for a range of applications. In addition, the FA155-2 Time Delay Relay is UL and CSA approved.In summary, the FA155-2 Time Delay Relay is a versatile device that can be used in a range of applications and settings. It is powered by both DC and AC supplies, and its built-in digital LCD display can be programmed for different time intervals and ranges. It also functions off a single triac monitoring device, and provides an adjustable current setting, adjustable duration time setting, and a variety of vacuum pickups for different load requirements. Its UL and CSA approval makes it a safe and reliable device for any application.

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