CHFCAF120 EATON

CHFCAF120  EATON Relay Input Module

Product  Description：

The EATON Relay Input Module acts as a robust isolation and conditioning interface between field input devices (such as push buttons, limit switches, selector switches, or external relay contacts) and the low-voltage, sensitive circuitry of the central Programmable Logic Controller (PLC) or control system. Unlike solid-state input modules that use optocouplers, a relay input module specifically handles signals where the presence or absence of voltage (often AC or high-voltage DC) is used to trigger an internal relay coil within the module. This internal relay then provides a clean, isolated contact closure to the PLC's internal logic circuitry. The primary function of the module is to provide electrical isolation and noise immunity for the control system, protecting the sensitive electronics from voltage transients and high-voltage spikes originating from the industrial environment.

Product Parameters

The specific parameters for an EATON Relay Input Module depend on its design series and intended application, but generally include:

• Input Voltage Range: Specifies the voltage level the module is designed to accept from the field, often standard industrial voltages such as $120 \text{ V}_{\text{AC}}$, $240 \text{ V}_{\text{AC}}$, or $24 \text{ V}_{\text{DC}}$.

• Input Current: The minimum current required by the field device to reliably activate the internal relay coil, typically in the range of a few milliamps ($\text{mA}$).

• Number of Channels: The quantity of independent input points the module supports, commonly $4$, $8$, or $16$ points.

• Response Time: The time delay between the activation of the field device and the module registering the input, generally in the range of $10$ to $20 \text{ ms}$.

• Isolation Voltage: The maximum voltage difference the module can withstand between the field side and the logic side, often exceeding $2500 \text{ V}_{\text{rms}}$.

• Operating Temperature: Typically $-20^{\circ}\text{C}$ to $+60^{\circ}\text{C}$ to handle industrial environments.

Product Advantages

The EATON Relay Input Module offers distinct advantages, particularly in certain industrial settings. It provides superior electrical isolation between the field wiring and the control logic, enhancing the safety and longevity of the PLC system by preventing high-voltage surges from reaching the sensitive controller electronics. It exhibits high immunity to electrical noise, making it well-suited for applications near motor starters, variable frequency drives (VFDs), or other sources of electromagnetic interference. Furthermore, its ability to handle various input voltage levels (especially higher AC voltages) with a single module type simplifies inventory and system design. The use of a physical relay contact allows for a clear, unambiguous signal state to the control system.

Important Considerations (Precautions)

Several precautions should be taken when installing and using the Relay Input Module. Due to the presence of internal mechanical relays, these modules typically have a slower response time compared to solid-state input modules, which may make them unsuitable for high-speed or time-critical applications. The lifespan of the module is finite, limited by the mechanical wear and tear (cycles) of the internal relays, although the lifespan is very high for the input side, as the internal relay only operates once per state change. Users must ensure that the correct voltage and current characteristics of the field device exactly match the specifications of the input module to prevent damage to the internal relay coil. Proper wiring practices are crucial, including correct terminal assignment and secure fastening, to maintain signal integrity and safety.

Product Applications

EATON Relay Input Modules are widely applied in industrial environments that prioritize robustness and high isolation over speed. They are commonly used for interfacing with standard control panel devices such as emergency stop buttons, general-purpose pilot lights, and manual selector switches that operate on $120 \text{ V}_{\text{AC}}$ or $24 \text{ V}_{\text{DC}}$ power. They are ideal for monitoring limit switches and pressure switches in hydraulic or pneumatic systems. Furthermore, these modules are often utilized when interfacing with external, older control systems or machine safety circuits that rely on traditional relay logic output signals, providing a reliable and electrically isolated means of communication into the modern control system.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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