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Drilling Rig Electrical · Ross Hill / NOV

Ross Hill AC Control Module

The AC firing and protection module in Ross Hill and NOV SCR drilling systems — part 0521-2500-14. Surplus, replacement, and cross-referenced.

The 0521-2500-14 is the AC control module in Ross Hill and NOV SCR drilling systems — it generates the SCR gate-firing signals and handles assignment and protection for the drive. Edmundson Industrial sources it new old stock, surplus, used-tested, and reconditioned. Send the number and we'll tell you what we can find.

Independent sourcing, not an authorized distributor. Ross Hill and NOV are trademarks of their respective owners, used for reference only. Condition is disclosed before sale.

Status

Part number0521-2500-14 (also seen as 521250000)
EI referenceEI-0521-2500-14
SystemRoss Hill / Hill Hayes / NOV SCR drilling
Module typeAC control — firing and protection
FunctionGenerates SCR gate-firing signals; drive assignment and protection
NOV equivalentNumber carried forward (verify against the label)
Pairs withDC control module 0522-2400-23
ConditionNew old stock, surplus, used-tested, reconditioned

Verify the exact dash number and revision against the module label before ordering.

Where it sits in the SCR system

AC inputBus from diesel engine–generator sets, commonly 600 V AC
ConversionPhase-angle-controlled SCR (thyristor) AC-to-DC
DC output0–750 V DC, stepless
Per-SCR currentabout 1600 A continuous, typical
Assignable toDrawworks, mud pumps, and rotary table
ControlAC firing / assignment module plus DC regulation module (handwheel / throttle setpoint)

Typical SCR drilling-system values; configurations vary by rig. Verify against the equipment.

Condition & sourcing

We supply Ross Hill and NOV AC modules as new, new-surplus, used-tested, and reconditioned, with condition disclosed before sale and photos on request. We are an independent surplus and sourcing company, not an authorized distributor.

FAQ

What is the Ross Hill AC control module?
It is the AC control board in a Ross Hill / NOV SCR drilling drive, part 0521-2500-14. It generates the SCR gate-firing signals and handles drive assignment and protection.
Is the Ross Hill AC module the same as the NOV AC module?
In most cases yes. NOV carried the Ross Hill AC numbering forward, so 0521-2500-14 is typically the same part. We verify against the label before quoting.
What is the difference between the AC and DC module?
The AC control module handles firing and protection; the DC control module handles regulation, setting the SCR phase angle from the handwheel setpoint. They work together as a pair.
Can you supply a replacement?
Yes. We source 0521-2500-14 as new old stock, surplus, used-tested, and reconditioned, with condition disclosed before sale.

Request a Quote

Request a Quote

or send the part number to sales@edmundsonindustrial.com · (832) 975-8827 · Houston, TX. Same-day response on most requests.

Related

Send 0521-2500-14 and your need-by date.

Condition disclosed before sale. Same-day response on most requests.

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