ABB KRAFT-DC2 Migration-Ready DC Drive Control Board

Overview

ABB KRAFT-DC2 Migration-Ready DC Drive Control Board for Legacy Control Systems

The ABB KRAFT-DC2 is a migration-ready DC drive control board engineered for direct replacement and retrofit integration within ABB KRAFT Series legacy DC drive systems. As industrial facilities face increasing pressure to modernize aging automation infrastructure, the KRAFT-DC2 provides a reliable, drop-in compatible solution that preserves existing control logic, minimizes rewiring effort, and reduces unplanned downtime during system transitions. Whether you are replacing a failed board in an emergency shutdown scenario or executing a planned control cabinet upgrade, the KRAFT-DC2 is pre-tested, warehouse-stocked, and dispatched globally with a support terms confirmed by quotation.

The KRAFT-DC2 board interfaces directly with the KRAFT Series drive chassis, maintaining compatibility with the original backplane connector layout, field bus addressing, and terminal wiring scheme. Engineers undertaking a retrofit must verify the DC bus voltage rating, armature current capacity, and field excitation circuit parameters against the existing drive nameplate before installation. The board’s onboard firmware is factory-configured for standard KRAFT Series operation; however, sites running customized speed reference scaling or torque limit profiles should back up the existing parameter set via the drive’s serial interface prior to board swap.

During retrofit planning, it is essential to confirm that the control cabinet’s 24 VDC auxiliary power supply — often shared with the SDCS-CON-4 control section or equivalent — can sustain the KRAFT-DC2’s logic power draw without voltage sag. In multi-drive cabinets where the KRAFT-DC2 operates alongside ABB DCS800 series converter modules or SDCS-PIN-205 power interface boards, bus loading calculations should be revisited to prevent nuisance trips during simultaneous start sequences. Signal isolation between the KRAFT-DC2 analog reference inputs and upstream PLC analog output modules is strongly recommended, particularly in environments with high-frequency VFD switching noise on shared cable trays.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful KRAFT-DC2 retrofit begins well before the board arrives on site. Maintenance engineers should compile the existing drive’s parameter printout, terminal wiring diagram, and cabinet layout drawing as the baseline reference package. In systems where the KRAFT-DC2 controls a DC motor coupled to a process-critical load — such as a winder, extruder, or crane hoist — the retrofit scope typically extends beyond the control board itself.

Facilities running ABB SDCS-CON-4 control units in adjacent drive bays should audit the shared fieldbus segment to confirm that adding or replacing the KRAFT-DC2 does not disrupt node addressing on the existing communication ring. Where the drive communicates upstream to a DCS or SCADA via a PROFIBUS DP or Modbus RTU link, the GSD file or register map should be validated against the replacement board’s firmware version to avoid data mapping mismatches that could affect HMI display values or interlock logic.

I/O wiring adaptation is another critical checkpoint. The KRAFT-DC2’s analog input terminals for speed reference and current feedback must be matched to the existing cable terminations; any shield grounding changes should be documented. In cabinets where the KRAFT-DC2 shares a DIN rail with ABB SNAT 601 TAI analog input modules or similar signal conditioning hardware, terminal block labeling should be verified against the as-built wiring schedule before energization. For sites using a programming cable such as the ABB NDPA-02 or equivalent USB-to-serial adapter for parameter upload, confirm driver compatibility with the site laptop’s operating system before the maintenance window begins.

Where the retrofit is part of a broader control cabinet upgrade — for example, migrating from a standalone KRAFT Series drive to an ABB DCS800 platform — the KRAFT-DC2 may serve as an interim replacement to restore production while the full migration is engineered. In this scenario, the board’s support terms confirmed by quotation provides a meaningful operational buffer, allowing the facility to plan the next-phase upgrade without the pressure of an unprotected spare.

Downtime Control During System Migration

Minimizing production downtime during a KRAFT-DC2 board replacement requires a structured pre-outage preparation protocol. The maintenance team should complete all parameter backups, spare parts staging, and wiring verification during a scheduled inspection window prior to the actual board swap. On the day of replacement, the sequence should follow: controlled drive shutdown, DC bus discharge confirmation, board extraction, KRAFT-DC2 installation, parameter restore, no-load test, and finally supervised production restart.

Protecting the original program logic is non-negotiable. If the existing KRAFT Series drive stores application-specific speed ramps, torque limits, or interlock sequences in non-volatile memory on the control board, these must be extracted and documented before the old board is removed. Where the drive is integrated into a larger PLC-controlled process — for example, a Siemens S7-300 or Allen-Bradley ControlLogix system managing the drive via analog speed reference — the PLC program’s drive fault handling routines should be reviewed to ensure they respond correctly to the KRAFT-DC2’s fault output signal levels and timing.

Field control continuity during the swap can be maintained by placing the process in manual bypass mode where the plant design permits, or by coordinating with the operations team to schedule the outage during a low-production period. Post-installation, a phased ramp-up — starting at 10–20% speed and progressively increasing to full load while monitoring armature current, field current, and drive temperature — is the recommended commissioning approach to confirm the KRAFT-DC2 is operating within specification before returning the drive to automatic control.

Retrofit Support FAQ

Q1: Is the KRAFT-DC2 a direct drop-in replacement for the original KRAFT Series control board?
Yes. The KRAFT-DC2 is designed as a direct replacement for the standard KRAFT Series DC drive control board, maintaining the same backplane connector, terminal layout, and firmware baseline. Minor parameter adjustments may be required to match site-specific speed reference scaling or field excitation settings. Pre-shipment functional testing is performed on every unit before dispatch.

Q2: What commissioning steps are required after installing the KRAFT-DC2?
After physical installation, restore the parameter set from your backup, verify the speed reference input signal level at the analog terminals, confirm field excitation circuit continuity, and perform a no-load test run before returning the drive to production. If the drive communicates with a SCADA or HMI system, validate that all data points are reading correctly before releasing the drive to automatic control.

Q3: Can the KRAFT-DC2 be used in a cabinet alongside other ABB drive modules?
Yes. The KRAFT-DC2 is compatible for use in multi-drive cabinets alongside ABB DCS800 series converters, SDCS-PIN-205 power interface boards, and SNAT series I/O modules, provided that auxiliary power supply capacity and fieldbus node addressing are verified before energization. Signal isolation between the KRAFT-DC2 analog inputs and adjacent drive control signals is recommended in high-noise environments.

Q4: What does the support terms confirmed by quotation cover, and is stock available for urgent orders?
The support terms confirmed by quotation cover manufacturing defects and functional failures under normal operating conditions from the dispatch date. Multi-region stock is maintained to support urgent replacement requirements, with fast global dispatch available. Contact the sales team directly for lead time confirmation and emergency order processing.

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Product Identification

Brand / Ecosystem

ABB
ABB

Model / Series

KRAFT-DC2

Product Family

Variable Frequency Drives

Availability Status

Available on request after model and quantity confirmation

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B2B RFQ, replacement inquiry and project spare-part request

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Specification & Inquiry Focus

Drive range

AC drives, VFDs and accessories

Common needs

Voltage, kW/HP and load type

Project support

Motor control, energy saving and spares

Inquiry Support

• Input/output voltage and kW/HP confirmation
• Energy-saving motor control inquiry
• Accessory and spare-unit support

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• Quantity and required delivery time
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