NORD NORDAC SK 700E Drives – SK700E-112-340-A-GBB-BY

Technical Dossier

Product Details And Specifications

NORD NORDAC SK 700E Series: Comprehensive Module Range and Technical Overview

The NORDAC SK 700E is a compact, decentralized frequency inverter series developed by Getriebebau NORD GmbH & Co. KG (NORD Drivesystems), headquartered in Bargteheide, Germany. Since its introduction, the SK 700E has been deployed across heavy-process industries including petrochemical plants, water treatment facilities, cement production lines, pulp and paper mills, and marine logistics infrastructure. Its defining characteristic is the ability to mount directly onto the motor or gearmotor — eliminating centralized control cabinet wiring and reducing installation footprint in environments where panel space is constrained.

The SK 700E operates across a power range from 0.25 kW to 22 kW (three-phase input), with supply voltage classes covering 230 V and 400/500 V AC. The series supports multiple fieldbus protocols natively or via plug-in option boards, including PROFIBUS DP, CANopen, DeviceNet, and Modbus RTU — making it compatible with both legacy DCS architectures and modern PLC-based control systems. Its IP55/IP65/IP66 enclosure ratings allow direct installation in wet, dusty, or chemically aggressive environments without additional protective housing.

As of 2026, the SK 700E series has entered the mature-to-declining phase of its product lifecycle. NORD has transitioned its primary development focus to the NORDAC FLEX SK 200E and NORDAC LINK SK 250E platforms. Facilities still operating SK 700E drives face a narrowing window for OEM spare part availability, making third-party sourcing and lifecycle extension planning a critical operational priority.

The Evolution of SK 700E Architecture

The SK 700E succeeded the earlier NORDAC SK 700 (non-E) platform, which lacked integrated fieldbus capability and required external communication adapters for all network protocols. The "E" designation introduced an embedded electronics architecture with a unified parameter structure (NORD ParameterBox compatible) and a standardized option slot system for fieldbus boards.

Early SK 700E units (pre-2010 production) used a discrete IGBT gate driver board separate from the main control PCB. Later revisions consolidated these into a single-board design, improving thermal management but creating a firmware compatibility boundary — drives manufactured before and after this revision do not share identical parameter sets, which is a critical consideration when performing drop-in replacements in multi-drive installations.

The GBB suffix in the model string (as in SK700E-112-340-A-GBB-BY) denotes the integrated gearbox-mounted variant with a specific mechanical interface configuration. The BY suffix indicates a bus-capable variant with a specific fieldbus option pre-installed at the factory. These suffix codes are not interchangeable; substituting a non-GBB or non-BY variant into a GBB-BY installation requires mechanical adapter plates and fieldbus reconfiguration.

NORD's successor platforms (SK 200E, SK 250E) are not backward-compatible with SK 700E mounting interfaces or parameter structures. Migration requires new motor mounting hardware, updated PLC function blocks, and full recommissioning — a project-level undertaking that justifies maintaining SK 700E spare inventory for operational continuity.

NORDAC SK 700E Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed models within the SK 700E series, organized by power class and configuration. Each entry reflects a distinct hardware variant with specific electrical and mechanical parameters.

0.25 kW – 0.75 kW Class (Single & Three-Phase)

• SK700E-250-123-A: 0.25 kW, 230 V 1-phase input, standard IP55 enclosure, no fieldbus
• SK700E-370-123-A: 0.37 kW, 230 V 1-phase input, compact housing, analog I/O
• SK700E-550-123-A: 0.55 kW, 230 V 1-phase input, integrated brake chopper
• SK700E-750-323-A: 0.75 kW, 400 V 3-phase input, standard I/O, IP55

1.1 kW – 2.2 kW Class

• SK700E-112-323-A: 1.1 kW, 400 V 3-phase, standard housing, no fieldbus option
• SK700E-112-340-A-GBB-BY: 1.1 kW, 400 V 3-phase, gearbox-mount (GBB), factory fieldbus (BY)
• SK700E-152-323-A: 1.5 kW, 400 V 3-phase, standard enclosure, analog setpoint
• SK700E-152-340-A-GBB: 1.5 kW, 400 V 3-phase, gearbox-mount variant, no fieldbus
• SK700E-222-323-A: 2.2 kW, 400 V 3-phase, standard housing, digital I/O expanded
• SK700E-222-340-A-GBB-BY: 2.2 kW, 400 V 3-phase, gearbox-mount, factory fieldbus

3.0 kW – 7.5 kW Class

• SK700E-302-323-A: 3.0 kW, 400 V 3-phase, standard IP55, brake chopper integrated
• SK700E-402-323-A: 4.0 kW, 400 V 3-phase, extended I/O, PTC input
• SK700E-552-323-A: 5.5 kW, 400 V 3-phase, standard housing, fieldbus-ready slot
• SK700E-752-323-A: 7.5 kW, 400 V 3-phase, higher current rating, IP55

11 kW – 22 kW Class

• SK700E-113-323-A: 11 kW, 400 V 3-phase, enlarged heatsink, panel or wall mount
• SK700E-153-323-A: 15 kW, 400 V 3-phase, forced-air cooling, extended I/O
• SK700E-223-323-A: 22 kW, 400 V 3-phase, maximum power class in series, IP55

Fieldbus Option Boards (plug-in, SK 700E compatible)

• SK TU4-PBR: PROFIBUS DP slave option board for SK 700E
• SK TU4-CAO: CANopen option board, DS402 drive profile
• SK TU4-DNO: DeviceNet adapter for SK 700E slot

Sourcing Hard-to-Find & Obsolete SK 700E Parts

DriveKNMS maintains a dedicated procurement channel for NORD SK 700E units that are no longer available through standard distribution. As NORD's active product portfolio shifts toward the SK 200E and SK 250E platforms, authorized distributors are progressively reducing SK 700E stock. Lead times from OEM channels for specific suffix combinations (particularly GBB-BY variants) now routinely exceed 16–24 weeks where stock exists at all.

DriveKNMS sources SK 700E units through verified industrial surplus channels, decommissioned plant asset liquidations, and direct manufacturer overstock. All units are inspected prior to listing. For GBB-suffix (gearbox-mount) variants, mechanical interface dimensions are verified against NORD's published flange specifications before dispatch.

For facilities operating 10 or more SK 700E drives, DriveKNMS recommends establishing a minimum 2-unit buffer stock per critical drive position. The cost of a single unplanned production stoppage in a continuous-process environment — chemical, food processing, or logistics — routinely exceeds the cost of maintaining a 5-unit spare inventory by a factor of 10 to 50. This is not a speculative estimate; it reflects standard downtime cost modeling for motor-driven conveyor and pump applications.

Quality Control for the SK 700E Range

SK 700E units sourced through secondary markets require structured inspection before deployment. DriveKNMS applies the following verification steps to all SK 700E inventory:

• DC Bus Capacitor Assessment: Electrolytic capacitors on the DC bus are the primary aging component in any VFD. Units are tested for capacitance retention and ESR (equivalent series resistance) against NORD's published specifications. Capacitors showing more than 20% capacitance loss are flagged for replacement before sale.
• IGBT Gate Driver Integrity: Gate drive signals are verified under load simulation. Asymmetric switching behavior — a common failure mode in aged IGBT modules — is identified and disqualifies the unit from sale as-is.
• Firmware Version Verification: SK 700E firmware version is read via NORD ParameterBox or compatible interface. Units with firmware below a known stable release threshold are documented; buyers are informed of version status before purchase.
• Fieldbus Communication Test (BY variants): For units with the BY (fieldbus) suffix, the option board is tested for correct protocol handshake and data exchange. Non-functional fieldbus boards are replaced or the unit is sold as a non-BY variant with clear disclosure.
• Connector and Terminal Inspection: Power terminals, control terminals, and option board connectors are inspected for corrosion, mechanical deformation, and contact resistance. Corroded terminals are cleaned or replaced; units with deformed housings affecting IP rating integrity are not sold as IP55/IP66 rated.

For SK 700E availability, cross-reference requests, or bulk spare part sourcing:

• Email: [email protected]
• WhatsApp: +86 18359293191
• Web: driveknms.com