ERDM Series, Time Delay Relays

Time Delay Relays (TDRs) are electromechanical devices utilized in various applications to enable the control of large loads using a smaller control signal. These relays incorporate a built-in time delay mechanism, allowing for precise timing in triggering the relay's operation. TDRs offer a wide range of functions to accommodate different timing requirements and operational scenarios. Some of the common functions provided by TDRs include: Interval Function: In this mode, the relay operates for a specified duration of time after receiving a control signal, and then deactivates until the next signal is received. It is often used for cyclic operations or periodic tasks. Off-Delay Function: With the off-delay function, the relay remains energized for a predetermined period after the control signal is removed. This delay ensures that the load remains powered for a specific duration before being turned off. On-Delay Function: The on-delay function introduces a time delay between the reception of the control signal and the activation of the relay. This delay allows for a temporary pause before the load is energized. One-Shot Function: In one-shot mode, the relay triggers a single output pulse of a defined duration when the control signal is received. This function is commonly used for momentary operations or as a pulse generator. Programmable (Multi-function) TDRs: These TDRs provide flexibility by offering multiple programmable timing functions in a single device. Users can configure the desired timing parameters according to their application requirements. Repeat Cycle Function: With the repeat cycle function, the relay alternates between on and off states at regular intervals, allowing for repetitive operation. Twin Timer Function: Twin timer TDRs feature two separate adjustable timers that operate independently, enabling more complex timing sequences or dual-output operations. Signal On-Off-Delay Function: This function combines both on-delay and off-delay functions, allowing for control of the load based on specific time periods for activation and deactivation. Star/Delta Controller: The star/delta controller function is commonly used in motor control applications. It provides a specific starting sequence for motors, optimizing their performance and reducing the initial high-current demand during startup. Time Delay Relays are versatile devices that find applications in various industries, including automation, control systems, HVAC, lighting, and motor control. They offer precise timing control and serve as reliable tools for coordinating the operation of large loads with smaller control signals.