NOV 10509209-001: Dynamic Brake Resistor Bank
The NOV 10509209-001 dynamic brake resistor bank: where braking energy from a drilling drive is dissipated as heat.
Independent sourcing, not an authorized distributor. Ross Hill, NOV, and other manufacturer names and part numbers are used for reference only. Supplied as new-surplus, used-tested, or reconditioned, with condition disclosed before sale.
| Part number | 10509209-001 |
|---|---|
| Manufacturer | NOV |
| System | Ross Hill / Hill Hayes / NOV SCR drilling |
| Function | Dynamic braking |
| Condition | New-surplus, used-tested, reconditioned |
Also searched as
10509209-001 · 10509209001 · 10509209 · NOV 10509209-001 · dynamic brake resistor · dynamic braking resistor bank · DB resistor · brake resistor bank · drilling rig brake resistor
What it does
When a drilling drive brakes dynamically, the motor is driven by the load and acts as a generator. That energy has to be dissipated somewhere, and the resistor bank is where it goes: converted to heat and carried away by airflow.
These assemblies live harder than almost anything else on a rig: repeated thermal cycling, vibration, and in many installations direct weather exposure. Failures are usually blunt rather than subtle: open elements, cracked or distorted grids, and degraded terminations.
Symptoms that point here
Most people reach this page from a symptom rather than a part number. These are starting points for diagnosis, not a substitute for it.
| What you are seeing | What it usually indicates |
|---|---|
| Reduced braking capability | Open element in the bank |
| Braking falls off as the assembly heats | Partially degraded elements |
| Visible cracked, burned, or distorted grids | Inspect the whole bank, not just the visible face |
| Discoloured or loose terminations | Connection resistance: common and often repairable |
| Overtemperature or airflow alarms at the bank | Cooling path obstruction before assuming element failure |
| Weak or absent dynamic braking | Resistor bank: a different item from DWDB grid resistor 0100-1000-04; send the number on your unit |
Related and confusable numbers
| Number | What it is | Substitute? |
|---|---|---|
| 10509209-001 | NOV dynamic brake resistor bank identified by this exact assembly number. | This item |
| 0100-1000-04 | Ross Hill DWDB grid resistor assembly: drawworks dynamic braking. Related function, different assembly and numbering. | Different item |
Do not confuse this with the Ross Hill 0100-1000-04 DWDB grid resistor assembly. Both dissipate braking energy, but they are different assemblies carried under different numbering. If you are unsure which one is on your rig, send a photo of the bank and its plate. See the DWDB grid resistor page for the Ross Hill assembly.
Nameplate & revision
We verify the exact dash number and revision against the physical unit before quoting, and we send photos of the plate on the unit being offered. Send a photo of your nameplate, or type out what it reads, and we will match the revision rather than guess at it.
Condition & sourcing
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 equipment changes constantly: send the number and we will tell you what we can actually find.
Starting from a symptom: a gate firing pulse failure, a misfire, phase loss, one leg dead? The SCR Drive Fault Finder maps what you are seeing to the suspect module and part number.
FAQ
What is NOV 10509209-001?
How is it different from the Ross Hill DWDB grid resistor?
Can a resistor bank be repaired rather than replaced?
What causes these to fail?
Do you supply complete banks?
Availability & Quote
Condition disclosed before sale. Photos on request. Response timing is confirmed with the request.
Related
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