Ross Hill 0522-2400-21: DC Control Module (NOV 6415-2400-21)
The standard DC control module in a Ross Hill / NOV SCR drive, and the one Ross Hill number we have confirmed NOV reissued under its own number.
Independent supplier. RHCC 0522-2400-21 is identified from the installed number. Manufacturer and trademark names are used for reference only, and condition is disclosed before sale.
| Part number | 0522-2400-21 |
|---|---|
| NOV part number | 6415-2400-21 |
| Manufacturer | Ross Hill / NOV |
| System | Ross Hill / Hill Hayes / NOV SCR drilling |
| Module type | DC control: standard |
| Pairs with | AC control module 0521-2500-14 |
| Condition | New-surplus, used-tested, reconditioned |
Also searched as
0522-2400-21 · 0522240021 · 6415-2400-21 · 6415240021 · 0522-2400 · 2400-21 · NOV 6415-2400-21 · Ross Hill DC control module · RHCC DC module
Why this number matters
When NOV took on Ross Hill Controls and the Hill Hayes SCR line, most of the part numbering carried straight across: the Ross Hill number and the NOV number are usually the same number. This module carries a confirmed Ross Hill-to-NOV cross-reference. A unit stamped 6415-2400-21 and a unit stamped 0522-2400-21 identify the same item.
That matters commercially, because a buyer holding one number will often be told the part does not exist by a supplier who only indexes the other. If you have been quoted 'no longer available' against one of these numbers, it is worth trying the other.
Where it sits in the SCR system
The DC control modules are the regulation side of a Ross Hill SCR drive. The AC module handles gate firing, drive assignment, and protection; the DC module closes the current and speed loop that gives stepless control of the DC drilling motors. They work as a matched pair, and a fault in one is regularly misattributed to the other.
The 0522-2400 family
Several dash variants exist. They are not documented as interchangeable, and we do not treat them as such.
| Number | Part description | Relationship |
|---|---|---|
| 0522-2400-21 | DC control module, standard. NOV 6415-2400-21. | this page |
| 0522-2400-23 | DC control module, regulation. Sets SCR phase angle from the driller's handwheel setpoint. | Different variant |
| 0522-2400-27 | DC control module, series type, with 1K ohm resistor. | Different variant |
| 0522-2400-00 | DC control module, shunt type. | Different variant |
| 0521-2400-21 | Exact-match identifier that requires a physical board label; no interchange is assigned. | Nameplate confirmation required |
| 0521-2500-14 | AC control module: the other half of the pair, not a DC module. | Different function |
We will not tell you that two of these substitute for one another. Send the number that is actually on your board, and the rig and drive it came out of.
Nameplate & revision
We verify the exact dash number against the physical unit before quoting, and we send photos of the label on the unit being offered. If your board carries both a Ross Hill number and an NOV number, send both.
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
- Any second number on the same label: Ross Hill and NOV numbers often both appear
- Any revision letter or date code
- Rig, drive, and what the module is assigned to (drawworks, mud pump, rotary table)
- What the system is doing that led you here
- A photo of the board label and the card edge if you can take one
- Quantity and your need-by date
Condition and sourcing
RHCC 0522-2400-21 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 0522-2400-21, use the SCR Drive Fault Finder to narrow the subsystem before requesting a part.
Identification checkpoint
For RHCC 0522-2400-21, confirm nov part number: 6415-2400-21; module type: DC control: standard; pairs with: AC control module 0521-2500-14. Use the installed label and complete suffix before treating another item as equivalent.
FAQ
What is the Ross Hill 0522-2400-21?
Is 0522-2400-21 the same as NOV 6415-2400-21?
What is the difference between 0522-2400-21 and 0522-2400-23?
I have a module stamped 0521-2400-21, not 0522. Which is it?
Can you supply a replacement?
Availability & Quote
For RHCC 0522-2400-21, condition is disclosed before sale. Item photographs are supplied with an actual offer.
Related
Want a quick quote for 0522-2400-21?
Fill out your contact info here, and we'll get a quote sent to you ASAP!