Pepperl+Fuchs KFD2-VM-EX1.35 Replacement for KFD2 Series

Product Overview

Pepperl+Fuchs KFD2-VM-EX1.35 Replacement for KFD2 Series: Smooth Migration from Legacy Solenoid Driver Systems

The Pepperl+Fuchs KFD2-VM-EX1.35 is a 24 V DC-powered, single-channel intrinsically safe solenoid driver designed for use in Zone 1/2 and Division 1/2 hazardous areas. As aging DCS and safety instrumented systems (SIS) reach end-of-life, plant engineers and procurement teams increasingly require a verified, drop-in replacement that preserves existing wiring infrastructure, maintains SIL compliance, and eliminates the need for costly panel redesigns. This listing provides exactly that: a fully tested, original-specification KFD2-VM-EX1.35 module ready for immediate deployment.

Many facilities currently operating legacy Pepperl+Fuchs KFD0 or KFD1 Series barriers are migrating to the KFD2 platform to take advantage of improved diagnostics, standardized DIN rail mounting, and broader DCS compatibility. The KFD2-VM-EX1.35 slots directly into the KFD2 Series rack system, sharing the same 17.5 mm housing width and power bus architecture as other KFD2 modules such as the KFD2-STC4-Ex1 signal conditioner and the KFD2-UT2-Ex1 universal temperature transmitter. This means your existing rack, power feed module (e.g., KFD2-PW-Ex1.D), and field wiring remain unchanged during the swap.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a legacy solenoid driver system to the KFD2-VM-EX1.35 rarely involves a single component swap. In practice, plant engineers coordinate the replacement of several interdependent modules to ensure system-wide compatibility and minimize unplanned downtime.

On the power supply side, the KFD2-PW-Ex1.D power feed module provides the 24 V DC bus voltage that the KFD2-VM-EX1.35 and adjacent KFD2 modules share across the rack. If your existing power feed module is a legacy KFD0-PW type, replacing it with the KFD2-PW-Ex1.D is a prerequisite for full KFD2 platform compatibility. Similarly, the KFD2-EB2 termination board simplifies field wiring connections and reduces commissioning time when multiple KFD2 modules are installed in the same segment.

For facilities integrating the KFD2-VM-EX1.35 into a PROFIBUS PA or FOUNDATION Fieldbus architecture, the KFD2-BR-Ex1.PA segment coupler bridges the IS barrier layer with the fieldbus backbone, enabling centralized diagnostics from the DCS without additional signal conditioning hardware. Plants running Emerson DeltaV, Honeywell Experion, or ABB System 800xA will find that the KFD2 platform maps cleanly into existing I/O assignment tables, reducing the scope of control system engineering changes.

Where the solenoid driver controls a shutdown valve or emergency isolation valve (EIV) in a SIS loop, the associated KFD2-SR2-Ex2.W solenoid driver with relay output may be specified for redundant or dual-channel configurations. Pairing the KFD2-VM-EX1.35 with a KFD2-UT2-Ex1 universal temperature transmitter in the same rack allows engineers to consolidate IS barrier infrastructure for both discrete and analog field devices within a single DIN rail segment.

On the field device side, the solenoid driver interfaces directly with NAMUR-compatible solenoid valves. If the existing valve coil impedance or current draw falls outside the KFD2-VM-EX1.35 output specification, a KFD2-SOT2-Ex2 solenoid driver with test function provides an alternative with extended output current range and integrated partial stroke test capability — particularly relevant for SIL 2 proof-test requirements under IEC 61511.

For installations where physical panel space is constrained, the compact 17.5 mm width of the KFD2-VM-EX1.35 allows higher channel density compared to older 20 mm KFD0 modules. Combined with the KFD2-GUT-Ex1.D group alarm module, the upgraded rack provides collective fault signaling to the DCS without consuming additional I/O channels — a practical advantage in brownfield retrofits where spare I/O capacity is limited.

Retrofit Guidance FAQ

Q: Can I reuse existing field wiring when replacing a KFD0 solenoid driver with the KFD2-VM-EX1.35?
A: In most cases, yes. The KFD2-VM-EX1.35 uses the same 2-wire screw terminal interface as legacy KFD0/KFD1 solenoid drivers. Field cable pairs connected to the hazardous-area terminals do not require modification. Verify that the field cable shielding and grounding scheme complies with the KFD2 installation guidelines before energizing.

Q: Is the KFD2-VM-EX1.35 compatible with my existing DCS I/O card?
A: The module presents a standard discrete output interface to the safe-area DCS I/O card. No changes to the DCS I/O card, marshalling cabinet wiring, or control logic are required, provided the existing I/O card output voltage and current specifications match the KFD2-VM-EX1.35 input requirements (24 V DC, low-current control signal).

Q: Does the KFD2-VM-EX1.35 fit into a KFD0 rack without modification?
A: The KFD2 and KFD0 rack systems use different backplane bus connectors. A direct plug-in swap into a KFD0 rack is not supported. Migration to the KFD2 platform requires installing a KFD2-compatible rack segment. TOPNLMS can advise on rack selection based on your channel count and cabinet layout.

Q: What communication protocol does the KFD2-VM-EX1.35 support?
A: The KFD2-VM-EX1.35 is a discrete (on/off) solenoid driver and does not use a fieldbus communication protocol at the module level. System-level diagnostics are available via the KFD2 segment coupler when integrated into a PROFIBUS PA or FF segment. The module’s LED indicators provide local fault and power status without requiring a handheld communicator.

Q: How long does commissioning take after installing the replacement module?
A: For a like-for-like replacement within an existing KFD2 rack, commissioning typically involves verifying terminal connections, confirming LED status, and performing a functional test of the solenoid valve stroke. No software configuration is required at the module level. Total commissioning time per channel is typically under 30 minutes for experienced IS technicians.

Warranty Assurance

Every KFD2-VM-EX1.35 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each module undergoes functional verification including power-up testing, output continuity check, and LED status confirmation. Units are packaged in anti-static protective packaging with original labeling intact.

In the event of a confirmed defect within the warranty period, TOPNLMS provides replacement dispatch within 3 business days of fault verification. Our technical support team is available to assist with installation queries, compatibility confirmation, and documentation requests including CE declarations and ATEX certificates.

For time-critical plant shutdowns or turnaround projects, expedited shipping from our Xiamen warehouse is available to destinations across Asia, Europe, the Middle East, and the Americas. Lead times and freight options are confirmed at the time of order. Bulk procurement inquiries for MRO stocking programs are welcome.

Contact our industrial automation team to confirm availability, request a datasheet, or discuss system-level migration planning:

• Email: [email protected]
• Phone/WhatsApp: +86 18359293191
• Website: https://topnlms.com

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