Frequency Converter with Trip Values

KFD2-UFC-Ex1.D

Key Features

1-channel isolated barrier
24 V DC supply (Power Rail)
Input for NAMUR sensors or dry contacts
Input frequency: 1 mHz ... 5 kHz
Current output: 0/4 mA ... 20 mA
Relay contact and transistor output
Start-up override
Line fault detection (LFD)
Up to SIL 2 according to IEC 61508/IEC 61511

Function

The KFD2-UFC-Ex1.D is an isolated barrier designed for intrinsic safety applications. It functions as a universal frequency converter, transforming a digital input signal into a proportional analog output signal (0/4 mA ... 20 mA). It also serves as a switch amplifier and a trip alarm. The device offers adjustable switch outputs (two relay outputs and one potential-free transistor output) for functions like trip value display (min/max alarm), serially switched output, pulse divider output, and error signal output. Configuration can be done via the keypad or the PACTware software. Faults are indicated by LEDs according to NAMUR NE44, and a separate collective error message output is available.

Connection Diagram

The device features connections for Input I (intrinsically safe, terminals 1+, 3-) and Input II (non-intrinsically safe, terminals 13+, 14-). Outputs include Output I, II (terminals 10, 11, 12 and 16, 17, 18), Output III (terminals 19+, 20-), and Output IV (terminals 8+, 7-). The device is powered via 24 V DC from the Power Rail (terminals 23+, 24-).

Technical Data

General Specifications

Signal Type	Digital Input
Safety Integrity Level (SIL)	SIL 2
Supply Connection	Terminals 23+, 24- or power feed module/Power Rail
Rated Voltage	20 ... 30 V DC
Rated Current	approx. 100 mA
Power Dissipation/Power Consumption	< 2 W / 2.2 W

Input I

Input Type	Sensor acc. to EN 60947-5-6 (NAMUR) or mechanical contact
Pulse Duration	> 50 μs
Input Frequency	0.001 ... 5000 Hz
Line Fault Detection	Breakage ≤ 0.15 mA; short-circuit ≥ 6.5 mA
Startup Override	1 ... 1000 s, adjustable in steps of 1 s
Active/Passive	Startup override: 1 > 4 mA (for min. 100 ms) / 1 < 1.5 mA
Open Circuit Voltage/Short-Circuit Current	18 V / 5 mA

Output I, II

Contact Loading	253 V AC / 2 A / cos φ ≥ 0.7; 40 V DC / 2 A resistive load
Mechanical Life	5 x 10⁷ switching cycles
Energized/De-energized Delay	approx. 20 ms / approx. 20 ms

Output III

Type	Electronic output, passive
Signal Level	40 V DC

Output IV

Current Range	0 ... 20 mA or 4 ... 20 mA
Open Loop Voltage	max. 24 V DC
Load	max. 650 Ω
Fault Signal	Downscale ≤ 3.6 mA, upscale ≥ 21.5 mA (acc. NAMUR NE43)
Collective Error Message	Power Rail

Transfer Characteristics

Input I Measurement Range	0.001 ... 5000 Hz
Resolution	0.1% of the measurement value, ≥ 0.001 Hz
Accuracy	0.1% of the measurement value, > 0.001 Hz
Measuring Time	< 100 ms
Influence of Ambient Temperature	0.003 %/K (30 ppm)
Output I, II Response Delay	< 200 ms
Output IV Resolution	< 10 μA
Output IV Accuracy	< 20 μA
Influence of Ambient Temperature	0.005%/K (50 ppm)

Galvanic Isolation

Input I/other circuits	Reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V_eff
Output I, II/other circuits	Reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V_eff
Mutual Output I, II, III	Reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V_eff
Output III/Power Supply and Collective Error	Basic insulation according to IEC/EN 61010-1, rated insulation voltage 50 V_eff
Output III/Startup Override	Basic insulation according to IEC/EN 61010-1, rated insulation voltage 50 V_eff
Output III/IV	Basic insulation according to IEC/EN 61010-1, rated insulation voltage 50 V_eff
Output IV/Power Supply and Collective Error	Functional insulation acc. to IEC 62103, rated insulation voltage 50 V_eff

Directive Conformity

Electromagnetic compatibility: EN 61326-1:2013 (industrial locations)
Low voltage: EN 61010-1:2010
Conformity (Electromagnetic compatibility): NE 21:2006
Degree of protection: IEC 60529:2001
Input: EN 60947-5-6:2000

Mechanical Specifications

Degree of Protection	IP20
Connection	Screw terminals
Mass	300 g
Dimensions	40 x 119 x 115 mm (1.6 x 4.7 x 4.5 inch) (W x H x D), housing type C2
Mounting	On 35 mm DIN mounting rail acc. to EN 60715:2001

Data for Application in Connection with Hazardous Areas

EU-Type Examination Certificate

Certificate	TÜV 99 ATEX 1471
Marking	II (1)G [Ex ia Ga] IIC, II (1)D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I

Supply

Maximum Safe Voltage	40 V DC (Attention! U_m is no rated voltage.)

Input I

Voltage U_o	10.1 V
Current I_o	13.5 mA
Power P_o	34 mW (linear characteristic)

Input II

Maximum Safe Voltage U_m	40 V (Attention! The rated voltage can be lower.)

Output I, II

Maximum Safe Voltage U_m	253 V (Attention! The rated voltage can be lower.)
Contact Loading	253 V AC / 2 A / cos φ > 0.7; 40 V DC / 2 A resistive load

Output III

Maximum Safe Voltage U_m	40 V (Attention! U_m is no rated voltage.)

Output IV

Maximum Safe Voltage U_m	40 V DC (Attention! U_m is no rated voltage.)

Interface

Maximum Safe Voltage U_m	40 V (Attention! U_m is no rated voltage.)
Certificate	TÜV 02 ATEX 1885 X
Marking	II 3G Ex nA nC IIC T4 Gc
Output I, II Contact Loading	50 V AC / 2 A / cos φ > 0.7; 40 V DC / 2 A resistive load

Matching System Components

DTM Interface Technology

PACTware 5.X	Device type manager (DTM) for interface technology
PACTware	FDT Framework

Accessories

F-NR3-Ex1	NAMUR Resistor Network
K-250R	Measuring resistor
K-500R0%1	Measuring resistor
KF-ST-5GN	Terminal block for KF modules, 3-pin screw terminal, green
KF-ST-5BU	Terminal block for KF modules, 3-pin screw terminal, blue
KF-CP	Red coding pins, packaging unit: 20 x 6

Characteristic Curve

Maximum Switching Power of Output Contacts

The characteristic curve illustrates the relationship between voltage (U) and current (I) for the output contacts, indicating the maximum switching power for resistive loads (DC and AC) and the maximum switching cycles (10⁵).

Models: KFD2-UFC-Ex1.D Frequency Converter with Trip Values, KFD2-UFC-Ex1.D, Frequency Converter with Trip Values, Trip Values, Values

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