The power limit card in a Ross Hill / NOV SCR system. It caps total drawn power so the connected engine-generator sets are not pulled past their rating.
Independent sourcing, not an authorized distributor. Ross Hill and NOV are trademarks of their respective owners, used here for reference only. We supply this item as new-surplus, used-tested, and reconditioned, with condition disclosed before sale.
| Part number | 0509-7497 |
|---|---|
| EI reference | EI-0509-7497 |
| Stock code | EL09-7497-01 |
| System | Ross Hill / Hill Hayes / NOV SCR drilling |
| Function | SCR house control |
| Condition | New-surplus, used-tested, reconditioned |
| Also searched as | 0509-7497 · 05097497 · 7497 · EI-0509-7497 · EL09-7497-01 · Ross Hill · NOV · Hill Hayes |
An SCR drilling system can demand more power than the generators online can deliver — drawworks hoisting while the mud pumps are loaded is the classic case. The power limit controller watches total demand and rolls back SCR firing before the engines are dragged down. When this card fails, the protection it provides disappears quietly: nothing looks wrong until a heavy simultaneous load pulls the plant down.
Most people arrive at this page from a symptom, not a part number. These are the failure signatures associated with this item. They are starting points for diagnosis, not a substitute for it.
| What you are seeing | What it usually indicates |
|---|---|
| Engines bog or black out on simultaneous heavy loads | Power limiting not rolling back SCR demand |
| Limit appears to act far too early, choking normal drilling | Limit setpoint or card output drifted |
| Load never limits at all regardless of demand | Controller output stuck — protection effectively absent |
| Erratic limiting that does not track generators online | Card or its inputs degraded |
Revisions differ across the production life of this equipment, and on some Ross Hill items the dash suffix carries a calibration rather than a revision level. We verify the exact dash number and revision against the physical unit before quoting, and we will send photos of the plate on the unit we are offering.
Send a photo of your nameplate, or type out what it reads, and we will match the revision rather than guess at it.
Supplied as new-surplus (unused, from the secondary market), used-tested, or reconditioned, with condition disclosed before sale and photos on request. Availability on legacy Ross Hill and NOV items changes constantly — send the number and we will tell you what we can actually find rather than quote something we cannot deliver.
Condition always disclosed before sale. Photos on request. Same-day response on most requests.
Condition disclosed before sale. Same-day response on most requests.