Danfoss 175Z Series Relay & Control Modules: 175Z2330 DT1

Technical Dossier

Product Details And Specifications

Danfoss 175Z Series: Comprehensive Module Range and Technical Overview

The Danfoss 175Z series represents a broad family of relay modules, circuit board cards, and control interface components deployed across global heavy industry sectors including petrochemical refineries, offshore platforms, district heating networks, and large-scale HVAC central plant installations. Danfoss, headquartered in Nordborg, Denmark, has supplied drive and control electronics to industrial OEMs since the 1960s. The 175Z prefix designates spare and replacement board-level components for the VLT® frequency converter product line — one of the most widely installed variable frequency drive (VFD) families in the world. These modules are embedded in critical process loops where unplanned downtime carries direct operational cost. The installed base of VLT® drives using 175Z-series boards spans multiple generations of hardware, from legacy VLT 3000/5000 platforms to VLT AutomationDrive FC 302 variants, ensuring sustained demand for both active and discontinued part numbers.

The Evolution of 175Z Series Architecture

The 175Z component numbering system was introduced by Danfoss as a unified spare parts catalog reference for board-level assemblies within the VLT® drive platform. Early iterations, associated with the VLT 3002–3800 and VLT 5001–5262 series (introduced in the late 1980s through the 1990s), used through-hole PCB construction with discrete relay logic and analog signal conditioning. These boards — including early relay output cards and gate driver assemblies — were designed for direct replacement in the field without drive reconfiguration.

The transition to surface-mount technology (SMT) in the early 2000s coincided with the VLT AutomationDrive FC 301/302 platform launch. This generation introduced IGBT gate driver boards, fieldbus option cards (PROFIBUS, DeviceNet, CANopen), and modular I/O expansion cards under the 175Z prefix. Compatibility between generations is not guaranteed: voltage ratings, connector pinouts, and firmware handshake protocols differ between VLT 5000-era and FC 302-era boards. Engineers sourcing 175Z parts must verify the drive frame size, software version, and hardware revision before substitution.

As of 2026, the VLT 3000 and VLT 5000 series are fully discontinued. Danfoss no longer manufactures or supplies original spare boards for these platforms. The FC 302 series remains in active production, though several early-revision 175Z sub-assemblies have transitioned to end-of-life status. This creates a sustained aftermarket requirement for tested, traceable surplus stock — the primary service DriveKNMS provides.

175Z Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced components within the Danfoss 175Z relay module and circuit board card family. Each entry reflects a discrete board-level assembly with a defined function within the VLT® drive architecture.

Relay Output & Control Board Modules

• 175Z2330 DT1: Relay module circuit board card; output relay interface for VLT drive control logic.
• 175Z0401: Relay output card; 3-relay output module for VLT 5000 series drives.
• 175Z0402: Extended relay output board; 5-relay configuration for high-density I/O applications.
• 175Z0403: Relay board assembly; used in VLT 3500–3800 frame sizes for motor contactor control.
• 175Z0861: Control card; main logic board for VLT 5001–5062 low-power frame drives.
• 175Z0862: Control card variant; VLT 5072–5102 mid-range frame, includes analog I/O terminals.
• 175Z0863: Control card; VLT 5122–5202 frame, supports encoder feedback input.

Gate Driver & Power Interface Boards

• 175Z0864: IGBT gate driver board; interfaces control card to power module in VLT 5000 series.
• 175Z1285: Gate driver card; FC 302 frame D/E, drives six-pulse IGBT bridge.
• 175Z1286: Power card assembly; DC bus measurement and brake chopper interface, FC 302.
• 175Z2829: Power card; FC 302 frame B, integrates inrush relay and soft-charge circuit.
• 175Z2830: Power card variant; FC 302 frame C, higher current rating soft-charge relay board.

Fieldbus Option & Communication Cards

• 175Z0114: PROFIBUS DP option card; MCA 101, plug-in fieldbus adapter for VLT AutomationDrive.
• 175Z0115: DeviceNet option card; MCA 104, CAN-based network interface module.
• 175Z0116: CANopen option card; MCA 105, DS301/DS402 compliant fieldbus adapter.
• 175Z0118: EtherNet/IP option card; MCA 121, dual-port industrial Ethernet adapter.
• 175Z0119: PROFINET IRT option card; MCA 120, real-time Ethernet for FC 302 platform.

I/O Expansion & Encoder Feedback Modules

• 175Z0172: General purpose I/O option card; MCB 101, 3 analog inputs / 2 analog outputs expansion.
• 175Z0174: Encoder input card; MCB 102, HTL/TTL incremental encoder interface for closed-loop control.
• 175Z0175: Resolver feedback card; MCB 103, for synchronous motor vector control applications.

Sourcing Hard-to-Find & Obsolete 175Z Series Parts

DriveKNMS maintains a dedicated inventory program for discontinued and long-lead Danfoss 175Z components. The VLT 3000 and VLT 5000 board families have been out of OEM production for over a decade. Facilities operating legacy drives — particularly in district energy, water treatment, and continuous process industries — face a binary choice: full drive replacement at capital cost, or sourcing tested surplus boards to extend asset life.

DriveKNMS sources 175Z modules through decommissioned plant asset recovery, authorized surplus channels, and direct OEM overstock acquisition. All units are cataloged by part number, hardware revision, and manufacturing date code. Traceability documentation is available on request. For critical applications, DriveKNMS can provide functional test reports generated on Danfoss-compatible drive test rigs prior to shipment. Lead times for common 175Z relay and control cards are typically 3–10 business days from confirmed order.

Quality Control for the 175Z Range

Circuit board assemblies within the 175Z series present specific test challenges due to their integration of relay switching circuits, analog signal paths, and high-frequency gate drive signals on a single PCB. DriveKNMS applies a multi-stage inspection protocol to all 175Z units prior to dispatch.

Visual inspection covers solder joint integrity, capacitor condition (ESR measurement for electrolytic types), relay contact resistance, and connector pin seating. Functional testing is performed by installing the board into a compatible VLT drive frame and executing a defined load cycle: no-load run, ramp-up/ramp-down sequence, and relay output actuation verification. For gate driver boards, switching waveforms are captured on an oscilloscope to confirm rise/fall times within Danfoss specification. Control cards are tested for all analog I/O channels, digital input response, and serial communication handshake with the drive's LCP panel. Units that fail any stage are quarantined and not offered for sale.