Shaanxi Zhongguan Electric Control DWK3 Series Modules

Technical Dossier

Product Details And Specifications

Shaanxi Zhongguan Electric Control DWK3 Series: Comprehensive Module Range and Technical Overview

The DWK3 series, manufactured by Shaanxi Zhongguan Electric Control Co., Ltd (陕西中冠电控), represents a purpose-built line of industrial compensation control modules deployed across heavy process industries in China and export markets. These units are installed in chemical processing plants, thermal power stations, petroleum refining facilities, and large-scale HVAC and heating compensation systems. The DWK3 platform is engineered for temperature differential compensation control, providing closed-loop regulation in environments where thermal stability is a critical process variable. Its modular architecture allows integration into both standalone control panels and distributed control system (DCS) architectures, making it a standard reference component in Chinese industrial automation infrastructure.

The Evolution of DWK3 Architecture

The DWK3 series emerged from the broader DWK (电温控) product lineage developed for industrial temperature compensation applications in the Chinese domestic market. Early iterations of the DWK platform used analog signal processing with discrete relay output stages, targeting single-zone heating control. The DWK3 generation introduced multi-zone compensation logic, improved input signal conditioning for thermocouple and RTD sensors, and expanded output configurations to support both analog (4–20 mA) and digital switching loads.

Over successive hardware revisions, the DWK3 incorporated enhanced EMI shielding to meet GB/T electromagnetic compatibility standards required for installation in power plant control rooms. Compatibility with legacy panel wiring (DIN rail mounting, standard terminal block pitch) was preserved across revisions, enabling drop-in replacement without panel redesign. As the series matured, Shaanxi Zhongguan introduced suffix variants (e.g., BZM, BZ, ZM) to denote specific output configurations, input signal types, and compensation algorithm variants. The DWK3 series is now considered a mature product line; active production of certain suffix variants has been reduced, and procurement increasingly relies on authorized spare parts distributors and secondary market inventory channels.

DWK3 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented DWK3 series range. Each model is classified by primary function. Models marked with an asterisk (*) are confirmed to have reduced production availability and are sourced primarily through spare parts channels.

Compensation Controllers

• DWK3-110BZM: Single-zone temperature compensation controller, analog output, standard mounting
• DWK3-110BZ: Single-zone compensation controller, relay output variant, panel-mount
• DWK3-110ZM: Single-zone controller, digital display, modulating output*
• DWK3-220BZM: Dual-zone temperature compensation controller, 220V AC supply, analog output
• DWK3-220BZ: Dual-zone compensation controller, relay switching output, 220V*
• DWK3-220ZM: Dual-zone controller with digital setpoint display, modulating output*
• DWK3-380BZM: Three-phase compensation controller, 380V supply, analog output, heavy industrial
• DWK3-380BZ: Three-phase relay output compensation controller, 380V*

Input Signal Modules

• DWK3-PT100: RTD (PT100) input signal conditioning module for DWK3 platform*
• DWK3-TC-K: Type-K thermocouple input adapter module*
• DWK3-TC-E: Type-E thermocouple input adapter, low-temperature range*

Output & Expansion Modules

• DWK3-AO-1: Single-channel 4–20 mA analog output expansion module*
• DWK3-DO-4: 4-channel digital relay output module, DIN rail*
• DWK3-DO-8: 8-channel digital relay output expansion, panel-mount*
• DWK3-COM-485: RS-485 communication adapter for DWK3 series, Modbus RTU protocol*
• DWK3-PSU-24: 24VDC auxiliary power supply module for DWK3 panel assemblies*

Sourcing Hard-to-Find & Obsolete DWK3 Parts

DriveKNMS maintains a dedicated inventory program for the DWK3 series, with particular focus on suffix variants and expansion modules that have exited active production. Our sourcing process covers three primary channels: manufacturer-authorized new-old-stock (NOS) from certified regional distributors in Shaanxi province; tested surplus units recovered from decommissioned control panels in Chinese industrial facilities; and cross-compatible replacement units verified against original DWK3 electrical and mechanical specifications.

For end-users operating DWK3-based control systems in long-term facilities (power plants, chemical complexes with 20+ year operational horizons), DriveKNMS provides lifecycle extension support including: exact-match spare parts with traceability documentation, functional equivalence assessments for cross-brand substitution where original parts are unavailable, and batch procurement for planned maintenance shutdowns. All sourced units are accompanied by test reports and, where applicable, original manufacturer documentation.

Quality Control for the DWK3 Range

DWK3 modules undergo a structured incoming inspection and functional verification protocol at DriveKNMS facilities before dispatch. The process addresses the specific failure modes documented in this series, including output relay contact wear, analog signal drift in the input conditioning stage, and display driver degradation in units with integrated digital readouts.

Verification steps include: visual inspection of PCB, terminal blocks, and enclosure integrity; power-on functional test at rated supply voltage (110V / 220V / 380V as applicable); input signal simulation using calibrated RTD/thermocouple signal sources across the full measurement range; output verification against rated load (relay contact closure, analog output linearity check at 0%, 50%, and 100% of range); and RS-485 communication handshake test for COM-variant modules. Units that do not meet original specification thresholds are quarantined and not dispatched. Test records are retained and available upon request.