Pepperl+Fuchs KFU8-UFT-2.D Frequency Converter

Technical Overview

2-channel frequency converter monitors digital inputs (1mHz-1kHz) for direction, slip, sync. Provides 0/4-20mA, relay, transistor outputs. SIL 2, IP20.

Key Features

2-channel signal conditioner
Universal usage at different power supplies
Dry contact or NAMUR inputs
Input frequency 1 mHz ... 1 kHz
Current output 0/4 mA ... 20 mA
Relay contact and transistor output
Start-up override
Configurable by PACTware or keypad
Line fault detection (LFD)
Functions as a rotation direction indicator, slip monitor, frequency monitor, or synchronization monitor
Safety Integrity Level (SIL) 2 rated (IEC 61508)

Technical Specification Matrix

Parameter	Value
Signal Type	Digital Input
Input Type	Dry Contact or NAMUR
Input Frequency	1 mHz ... 1 kHz
Output Type	Current output 0/4 mA ... 20 mA, Relay contact, Transistor output
Number of Channels	2
Rated Supply Voltage	20 to 90 VDC / 48 to 253 V AC 50 to 60 Hz
Power Consumption	2.2 to 2.5 W
IP Rating	IP20
Safety Integrity Level	SIL 2 (IEC 61508)
Physical Weight (kg)	0.36
Dimensions L x W x H (cm)	11.43 x 4.06 x 11.94

Industrial Applications

1. Motor Speed and Direction Control in Manufacturing

This device can precisely monitor the speed and direction of industrial motors in conveyor systems or mixing processes, utilizing NAMUR sensors or dry contacts. It provides a 0/4-20mA signal for accurate speed control feedback to a PLC and relay outputs for direction indication or emergency stops.

Problem Solved

Ensures accurate motor speed and prevents reverse rotation, critical for process integrity and safety in applications requiring precise material handling where the IP20 rating is acceptable (e.g., inside a control cabinet).

NAMUR sensorsfrequency monitoringrotation direction0-20mA outputmotor controlindustrial automation

2. Pump Flow Rate Monitoring with Anomaly Detection

In fluid handling systems, the KFU8-UFT-2.D monitors the rotational speed of flow meters (with dry contact or NAMUR outputs) to calculate liquid flow rates. Its slip and synchronization monitoring features detect anomalies like cavitation or pump wear by comparing two flow signals or identifying unexpected frequency drops/spikes.

Problem Solved

Provides real-time flow rate data and early detection of pump malfunctions or blockages, preventing costly downtime and ensuring consistent process quality in controlled environments (IP20).

Flow measurementNAMUR inputfrequency-current conversionslip monitoringpump healthprocess control

3. Synchronization of Automated Assembly Line Sections

For complex assembly lines requiring precise synchronization between multiple sections, this frequency converter monitors the speed of two independent line segments via digital inputs. The synchronization monitor triggers alarms or adjustments (via relay or transistor outputs) if speed differences exceed tolerance, ensuring smooth material transfer.

Problem Solved

Prevents product jamming, damage, or misalignments caused by speed discrepancies between conveyor belts or robotic work cells, maintaining high throughput and product quality in automated manufacturing.

Synchronization monitordigital inputrelay outputindustrial assemblyautomationmaterial handling