DANFOSS FCD 311 Modules: FCD311PT4P66STR1DCF00T62C0

Technical Dossier

Product Details And Specifications

DANFOSS FCD 311 Series: Comprehensive Module Range and Technical Overview

The DANFOSS FCD 311 series is a dedicated decentralized frequency inverter platform engineered for installation directly on or near the driven motor, eliminating centralized control cabinet requirements. Deployed extensively across global heavy industry — including chemical processing plants, nuclear facility auxiliary systems, petroleum refineries, water treatment infrastructure, and continuous-process manufacturing — the FCD 311 occupies a critical position in distributed motor control architecture. Its IP66/IP67-rated enclosure variants allow direct field mounting in wash-down and outdoor environments, a specification that has made it the default selection for conveyor drives, pump stations, and fan arrays in facilities where cabinet space is constrained or hazardous area segregation is mandatory. The series supports 3-phase 380–480 V AC input across a power range of 0.25 kW to 7.5 kW, with integrated RFI filtering and brake chopper options available on selected variants. Its fieldbus-ready design supports PROFIBUS-DP, DeviceNet, AS-Interface, and CANopen communication adapters, enabling seamless integration into existing DCS and SCADA architectures without gateway hardware.

The Evolution of FCD 311 Architecture

The FCD 311 was introduced by DANFOSS Drives as a successor to the FCD 300 platform, addressing field-level integration demands that centralized VLT drives could not efficiently serve. The original FCD 300 required separate mounting enclosures and lacked native IP66 protection; the FCD 311 resolved both constraints by integrating the power electronics, control board, and EMC filter into a single sealed housing. Early production units (circa 2000–2005) used a parallel communication interface requiring dedicated FCD 300 protocol converters. From approximately 2006 onward, DANFOSS standardized the FCD 311 on the FC Series communication protocol stack, enabling backward-compatible fieldbus adapters shared with the VLT Micro Drive FC 51 and VLT HVAC Drive FC 102 families. This architectural convergence significantly reduced spare parts complexity for multi-drive installations. The FCD 311 series entered its mature/end-of-active-production phase; DANFOSS has positioned the VLT Decentral Drive FCD 302 as the primary modern replacement. However, the installed base of FCD 311 units in legacy chemical and water utility plants remains substantial, and long-term maintenance support — including refurbished units, tested spare boards, and compatible fieldbus adapters — remains commercially essential through specialist distributors.

FCD 311 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the DANFOSS FCD 311 series, classified by power rating and enclosure/communication configuration:

FCD311PT4P66STR1DCF00T62C0: 3-phase 380–480 V, IP66, PROFIBUS-DP, 1.1 kW decentralized inverter — the subject unit of this listing.
FCD311PT2P26STR1DCF00T62C0: 3-phase 380–480 V, IP66, 0.25 kW, standard I/O, no fieldbus adapter.
FCD311PT3P06STR1DCF00T62C0: 3-phase 380–480 V, IP66, 0.37 kW, standard I/O configuration.
FCD311PT4P06STR1DCF00T62C0: 3-phase 380–480 V, IP66, 0.75 kW, standard I/O, no fieldbus.
FCD311PT4P66STR1DCF00T62C1: 3-phase 380–480 V, IP66, 1.1 kW, PROFIBUS-DP, brake chopper variant.
FCD311PT5P56STR1DCF00T62C0: 3-phase 380–480 V, IP66, 1.5 kW, standard I/O.
FCD311PT7P56STR1DCF00T62C0: 3-phase 380–480 V, IP66, 2.2 kW, standard I/O.
FCD311PT9P06STR1DCF00T62C0: 3-phase 380–480 V, IP66, 3.0 kW, standard I/O.
FCD311PT11K6STR1DCF00T62C0: 3-phase 380–480 V, IP66, 4.0 kW, standard I/O.
FCD311PT15K6STR1DCF00T62C0: 3-phase 380–480 V, IP66, 5.5 kW, standard I/O.
FCD311PT18K6STR1DCF00T62C0: 3-phase 380–480 V, IP66, 7.5 kW, standard I/O, top of range.
FCD311PT4P66STR1DCF00T62C0-AS: AS-Interface communication variant, 1.1 kW, IP66.
FCD311PT4P66STR1DCF00T62C0-DN: DeviceNet communication variant, 1.1 kW, IP66.
FCD311PT4P66STR1DCF00T62C0-CO: CANopen communication variant, 1.1 kW, IP66.
FCD311PT7P56STR1DCF00T62C0-PB: PROFIBUS-DP, 2.2 kW, IP66, high-demand conveyor drive configuration.
FCD311PT11K6STR1DCF00T62C0-DN: DeviceNet, 4.0 kW, IP66, pump and fan duty variant.

Sourcing Hard-to-Find & Obsolete FCD 311 Parts

As the FCD 311 series has transitioned out of active DANFOSS production, procurement through standard distribution channels has become unreliable. DriveKNMS maintains a dedicated inventory program for FCD 311 lifecycle support, covering refurbished drive units, tested control boards, replacement keypads (LCP), and compatible fieldbus adapter modules. All sourced units undergo full functional verification prior to dispatch. For facilities operating FCD 311 drives in critical process loops — where unplanned downtime carries significant operational cost — DriveKNMS offers advance exchange programs and consignment stock arrangements. Customers requiring long-term maintenance contracts for multi-unit FCD 311 installations are encouraged to contact the technical sales team directly to discuss volume pricing and guaranteed lead times.

Quality Control for the FCD 311 Range

The FCD 311's integrated architecture — combining power stage, control electronics, and fieldbus interface in a single sealed housing — requires a structured test protocol that differs from modular rack-based drives. DriveKNMS applies the following verification sequence to all FCD 311 units processed through its facility: (1) Visual and mechanical inspection of the IP66 enclosure seals, cable entry glands, and terminal block integrity. (2) Power-on functional test at rated input voltage with motor load simulation across the full speed reference range (0–50/60 Hz). (3) Fieldbus communication verification — PROFIBUS-DP, DeviceNet, AS-Interface, or CANopen — using protocol-specific test masters to confirm node addressing, parameter read/write, and control word response. (4) Thermal cycling test to verify gate driver and IGBT module performance under load. (5) Parameter backup and factory reset confirmation prior to packaging. Units that fail any stage are quarantined, documented, and either repaired to specification or classified as non-serviceable. Test records are retained and available to customers on request.