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Drilling Rig Electrical · DC control

Ross Hill 0522-2400-27: DC Control Module, Series Type

The series-type DC control module in the Ross Hill / NOV 0522-2400 family. Series and shunt boards are not interchangeable.

Independent supplier. RHCC 0522-2400-27 is identified from the installed number. Manufacturer and trademark names are used for reference only, and condition is disclosed before sale.

Part number	0522-2400-27
Manufacturer	Ross Hill / NOV
System	Ross Hill / Hill Hayes / NOV SCR drilling
Module type	DC control: series type
Distinguishing feature	1K ohm resistor
Condition	New-surplus, used-tested, reconditioned

Also searched as

0522-2400-27 · 0522240027 · 0522-2400 · 2400-27 · Ross Hill DC control module series · RHCC DC module

What it does

The DC control modules in a Ross Hill SCR house close the regulation loop for the DC drilling motors: taking the driller's setpoint and controlling SCR firing to hold speed and current. The 0522-2400 family covers several variants, and the dash suffix is what tells you which configuration a given board was built for.

This one is recorded as the series type, carrying a 1K ohm resistor. Series and shunt field configurations are genuinely different electrical arrangements with different load behaviour, so the distinction is not cosmetic.

Series and shunt are not the same board

This is the single most useful thing to take from this page. Within the 0522-2400 family you will find at least a series type and a shunt type, plus a regulation variant and the standard module NOV renumbered. They share a family number and a form factor. They are not documented as interchangeable, and a board that drops into the rack is not evidence that it is the right board.

Number	Part description	Relationship
0522-2400-27	DC control module, series type, with 1K ohm resistor.	this page
0522-2400-00	DC control module, shunt type.	Different field configuration
0522-2400-23	DC control module, regulation. Sets SCR phase angle from the driller's handwheel setpoint.	Different variant
0522-2400-21	DC control module, standard. NOV 6415-2400-21.	Different variant

Symptoms that point here

Starting points for diagnosis, not a substitute for it.

What you are seeing	What it usually indicates
Motor will not hold speed under load	Regulation loop: check the module and its feedback
A replacement board went in and behaves differently	Wrong variant for the field configuration: check the dash number
Fault clears on reseat and returns	Card-edge connector or backplane, not necessarily the card
One drive misbehaves and the others are fine	Compare dash suffixes across the boards in the house
No field or weak field on the DC motor	Field regulation: confirm series vs shunt from the motor, not the drawing; the -27 is the series type

Nameplate & revision

We verify the exact dash number against the physical unit before quoting and send photos of the label on the unit being offered. Send a photo of your board, or type out exactly what the label reads, and we will match the variant rather than guess at it.

What to send us

These are the details that let us identify the right unit instead of guessing at it.

The complete number as stamped, including the dash suffix
Whether the motor field is series or shunt wound, if you know
Any revision letter or date code on the board
Rig, drive, and what the module is assigned to
A photo of the board label and, if possible, the board itself
Quantity and your need-by date

Condition and sourcing

RHCC 0522-2400-27 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 0522-2400-27, use the SCR Drive Fault Finder to narrow the subsystem before requesting a part.

Identification checkpoint

For RHCC 0522-2400-27, confirm module type: DC control: series type; distinguishing feature: 1K ohm resistor. Use the installed label and complete suffix before treating another item as equivalent.

FAQ

What is the Ross Hill 0522-2400-27?

It is the series-type DC control module in the Ross Hill / NOV 0522-2400 family, identified with a 1K ohm resistor.

What does 'series type' mean here?

It refers to how the DC motor field is configured. A series-wound field and a shunt-wound field behave very differently under load, and the control module that regulates them is matched to the configuration. This is why a module from the same family is not automatically a replacement.

Can I fit a -23 or a -00 in place of a -27?

We would not tell you that you can. The -23 is recorded as the regulation module and the -00 as the shunt type. They are different variants within one family. Confirm the dash number on your board before ordering anything.

What is the 1K ohm resistor for?

It is an identifying feature of this dash-number variant. Its circuit function is not required for part-number matching; send a clear board photograph for comparison.

Can you supply one?

We source these as new-surplus, used-tested, and reconditioned, with condition disclosed before sale. Availability on legacy Ross Hill boards changes constantly: send the number and we will tell you what we can actually find.

Availability & Quote

For RHCC 0522-2400-27, 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 0522-2400-00 Shunt-Type DC Module Ross Hill 0522-2400-21 DC Module (NOV 6415-2400-21)Ross Hill DC Module 0522-2400-23 Ross Hill / NOV Cross-Reference SCR House Replacement Parts

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