Pepperl+Fuchs KFD2-DWB-Ex1.D Rotation Speed Monitor for NAMUR Sensors and Dual Relay Trip Control

Pepperl+Fuchs KFD2-DWB-Ex1.D is a single-channel isolated rotation speed monitor designed for machinery supervision and hazardous-area sensor circuits. It evaluates pulse frequency from a NAMUR sensor or dry contact, compares the signal with configurable limits, and provides two independently adjustable relay outputs. The module is commonly selected for underspeed, overspeed, standstill, and equipment protection applications.

Core Functions

KFD2-DWB-Ex1.D accepts a pulse signal with a published frequency range of 0.001 Hz to 5 kHz. Each relay can be configured for a separate minimum- or maximum-speed limit, allowing one output to provide an early warning and the second to initiate a protective action. A start-up override prevents an unwanted low-speed trip while equipment accelerates, while restart inhibit can retain a detected fault until the required reset is completed.

• 24 V DC supply through terminals or Pepperl+Fuchs Power Rail
• NAMUR sensor or dry-contact input
• Two configurable relay contact outputs
• Line fault detection for open- and short-circuit conditions
• Front-panel display and keypad configuration
• Bounce filter and adjustable start-up override
• Functional safety capability up to SIL 2

Typical Applications

This model is often used for conveyor underspeed monitoring, pump and fan supervision, agitator rotation, crusher or mill protection, screw feeders, bucket elevators, and other equipment where shaft movement is represented by pulse frequency. Its intrinsically safe input supports a suitable field sensor in a hazardous area while the KFD2-DWB-Ex1.D is installed in the designated control cabinet.

Checks Before Replacement or Commissioning

Correct operation depends on both hardware selection and parameter settings. Before replacing an installed unit, record the complete model code and the existing configuration. Confirm the sensor type, number of target pulses per revolution, normal operating speed, alarm limits, relay logic, start-up time, and reset behavior.

• Verify that the field sensor and hazardous-area loop match the approved design.
• Calculate the expected pulse frequency from the real target count and shaft speed.
• Test both relay trip points and the start-up override.
• Confirm the response to sensor open circuit and short circuit.
• Record the final settings after commissioning.

Purchasing Information

For a quotation, provide the full model number KFD2-DWB-Ex1.D, required quantity, destination country, delivery deadline, and a clear product label photo. For replacement projects, the current parameter record and sensor model help confirm the correct item. Sunup-MTL supports model checking, sourcing, export packing, and international delivery for Pepperl+Fuchs K-System products.

Related Pepperl+Fuchs Speed Monitoring and Frequency Converter Models

The following models cover closely related rotation-speed monitoring, frequency conversion, trip-value evaluation, direction detection, and synchronization functions. Always confirm the complete model code, power supply, hazardous-area approval, input type, and output arrangement before replacement.