Ross Hill 0509-7497: Power Limit Controller PCB

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 supplier. RHCC 0509-7497 is identified from the installed number. Manufacturer and trademark names are used for reference only, and condition is disclosed before sale.

Part number	0509-7497
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 · Ross Hill · NOV · Hill Hayes

What it does

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.

Symptoms that point here

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
Power limit function engaging when it should not	The power limit controller PCB owns this function: verify at this board before condemning AC or DC modules

Confirm the installed unit

For 0509-7497, send the complete dash number and a clear nameplate or board-label photo. The quoted unit is matched to the supplied identifier before condition and lead time are confirmed.

Condition and sourcing

RHCC 0509-7497 is quoted only after current availability, condition, and lead time are confirmed. Any offered unit is identified as new-surplus, used-tested, or reconditioned before sale.

If the observed failure does not line up with RHCC 0509-7497, use the SCR Drive Fault Finder to narrow the subsystem before requesting a part.

FAQ

What is the Ross Hill power limit controller?

Part 0509-7497. It caps total system power draw so the online engine-generator sets are not loaded past rating during simultaneous heavy demand.

What happens if it fails?

Often nothing visible until a heavy combined load: then the plant can be pulled down. Loss of limiting is a protection loss, so it is worth confirming rather than deferring.

Can you supply a replacement?

We source it as new-surplus, used-tested, and reconditioned, with condition disclosed before sale.

Availability & Quote

For RHCC 0509-7497, condition is disclosed before sale. Item photographs are supplied with an actual offer.

Request a quote by emailing sales@edmundsonindustrial.com or by calling (832) 975-8827

Ross Hill / NOV Cross-Reference SCR House Replacement Parts Ross Hill AC Module Ross Hill DC Module SCR Bay Components Ross Hill / NOV SCR Houses Model 1400 Model 1500 Rebuild & Retrofit

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