Description
ABB 07KT98C (GJR5253100R028) – AC31 CPU Module for Like‑for‑Like Legacy Control Replacement
The ABB 07KT98C, ordering code GJR5253100R028, is an AC 31‑series CPU used to keep legacy cabinets running with minimal disruption. From my experience, the “C” hardware variant is the one maintenance teams pick when they want a straightforward drop‑in swap—same base, same field terminations, and no cabinet redesign. You might notice it plugs onto the standard AC 31 backplane and brings expansion I/O up cleanly, which is a real time saver during tight outage windows.
Company’s Order Placement Process and Guarantees
- Warranty period: 365 days
- Delivery time: 1 week for in‑stock; no more than one month at the latest
- Payment method: 50% advance payment, full payment for delivery
- Express delivery methods: FedEx, UPS, DHL
- Process: Confirm model and quantity → Proforma Invoice → Advance payment → Functional testing and packing → Final payment → Express shipment with tracking
Key Features
- Drop‑in AC 31 replacement – Fits the original AC 31 base; field wiring typically remains untouched.
- “C” hardware variant – In many cases offers improved stability and broader firmware compatibility versus earlier builds.
- Backplane I/O integration – Talks to AC 31 expansion I/O over the native bus; addressing usually stays consistent.
- Built‑in serial ports – Typically RS‑232/RS‑485 for programming and device links (S‑Bus/Modbus are common on this family).
- Service‑friendly diagnostics – Front LEDs and simple power‑up checks make commissioning quicker during planned stops.
Technical Specifications
| Brand / Model | ABB – 07KT98C (GJR5253100R028), AC 31 CPU module |
| HS Code | 853710 (Programmable controller modules) |
| Power Requirements | 24 VDC via the AC 31 base/backplane (typical) |
| Dimensions & Weight | Standard AC 31 footprint; approx. 0.4–0.6 kg module class |
| Operating Temperature | 0…55 °C cabinet ambient (typical for ABB PLC hardware) |
| Signal Input/Output Types | Backplane interface to AC 31 I/O bases; field signals remain on terminal bases; optional fieldbus via add‑on modules |
| Communication Interfaces | RS‑232/RS‑485 serial for programming/devices (S‑Bus/Modbus RTU commonly supported); no integrated Ethernet on this class |
| Installation Method | DIN‑rail on AC 31 base; plugs into backplane with front‑accessible indicators |
Application Fields
Where 07KT98C typically fits best in day‑to‑day work:
- Legacy AC 31 cabinets in water/wastewater, HVAC and utilities
- OEM/discrete machines where a like‑for‑like CPU swap avoids a full migration
- Process skids with serial instruments and compact I/O counts
- Brownfield life‑extension projects across ABB installed bases
Advantages & Value
- Reliability: Like‑for‑like CPU swaps typically stabilize scan behavior and clear intermittent controller faults.
- Compatibility: Keeps the existing AC 31 base, I/O modules and serial links intact—no rewiring in most cases.
- Downtime savings: Faster restoration than migrating platforms; less requalification effort and documentation churn.
- Support: We can power‑up test, verify port LEDs/activity, and share a brief functional report before shipment.
“Swapped a failing CPU for 07KT98C. Project restored on the first try, RS‑485 links came up clean, and the plant hit the restart target.” — Controls technician, district water utility
Installation & Maintenance
- Cabinet setup: Mount on the AC 31 base; keep ventilation paths clear and follow derating guidance.
- Power & grounding: Provide a clean 24 VDC source; bond cabinet ground; segregate noisy loads from logic wiring.
- Programming & backups: Keep a current project backup; confirm clock/battery settings if your application uses them.
- Serial links: Match baud/parity; set RS‑485 termination/polarity; ground shields correctly to avoid loops.
- Handling & safety: Power down before removal/insertion; use ESD precautions when handling the CPU and connectors.
- Routine care: Quarterly dust removal, connector reseat checks, and periodic review of diagnostic/event logs.
Quality & Certifications
- Quality system: Manufactured under ISO 9001 processes (typical for ABB PLC hardware).
- Compliance: Suitable for CE/UL compliant industrial control panels; RoHS status may vary by production year.
- Warranty: 365‑day warranty from shipment date.
Share your AC 31 rack layout, I/O base types, firmware note (if known), and connected serial devices (protocol/baud). We’ll confirm 07KT98C (GJR5253100R028) compatibility and prepare a concise functional test record before dispatch.
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