KRDM221 Industrial Controls

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Time Delay Relays are electromechanical instruments that are designed to delay or initiate a series of operations following a predetermined period of time. They are commonly used in various industrial applications such as controlling motors, near- and far-field remote alarms, and process control systems. The KRDM221 is an example of a Time Delay Relay that is specifically designed for compressed air process systems.

The KRDM221 is an integral part of any automated process control system and can be used in installations where frequent field adjustments are necessary. It is equipped with an external device that allows for the control of the delay, enabling it to be adjusted in the field. This device can also be used to monitor and adjust the time delay settings. The external device is typically connected via a galvanic connection to the control unit, but can be controlled from any location when combined with a fiber-optic data connection.

The KRDM221 is built with an internal temperature control circuit, which is designed to protect the relay from malfunction due to excessive operating temperatures. This temperature control circuit can be adjusted in the field to prevent accidental over-heating or excessive cooling of the relay. This temperature control circuit also provides a significant degree of protection against over-current, voltage, and other power surges.

The KRDM221 employs an electro mechanical timing method for time delay. This allows for accurate and reliable timings ranging from one to 120 seconds. The user can adjust the time delay value in increments of 1/100ths of a second. The logic circuit is based on digital input signals (DC or AC) and employs a relay coil current for time delay. This method of time delay is suited for large industrial applications with a large power requirement.

The KRDM221 is programmed via a computer or other device. Programming involves setting the relay time delay value, the time unit (seconds, minutes, etc.), the contact type (normally open/closed, etc.), the voltage/current values, and the operation mode (cyclic, step, etc.). Once programmed, the relay can be automatically switched on/off according to the pre-set time delay values. Additionally, the KRDM221 is equipped with a digital input that can be used to reset and test the relay operation. This digital input feature ensures accurate and reliable operation.

In summary, the KRDM221 is a reliable and versatile Time Delay Relay ideal for applications requiring accurate and flexible delays. Its temperature control circuit provides additional protection against over-current, voltage, and other power surges. The unit is programmed via a computer or other device and can be manually adjusted in the field. The digital input feature ensures accurate and reliable operation and resets and tests the relay operation. The electro-mechanical time delay method ensures accurate and dependable performance.

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