Ross Hill 0000-8500-18: AutoSync AC II Module
The engine-calibrated AutoSync AC II generator-synchronising module, with the identification details that keep it from being mistaken for 0000-8500-00.
Independent supplier. RHCC 0000-8500-18 is identified from the installed number. Manufacturer and trademark names are used for reference only, and condition is disclosed before sale.
| Part number | 0000-8500-18 |
|---|---|
| Manufacturer | Ross Hill / NOV |
| System | Ross Hill / Hill Hayes / NOV SCR drilling |
| Function | Generator synchronising: engine-calibrated variant |
| Condition | New-surplus, used-tested, reconditioned |
Also searched as
0000-8500-18 · 0000850018 · 00008500-18 · 0000-8500 · 8500-18 · AutoSync AC II · Auto-Sync · Auto Sync · AC Module Auto Sync
What it does
The AutoSync AC II is the control that brings an incoming generator into synchronism with the running bus, matching voltage, frequency, and phase angle, and issues the permissive to close. On a diesel-electric rig, sets are paralleled and dropped as load changes, so this function runs constantly.
What makes the -18 worth its own page is that the dash suffix on this family is an engine calibration, not a revision level. The module has to be matched to the engine it is watching: the flywheel tooth count and magnetic-pickup frequency the card expects are set by the calibration. Fit the wrong one and it will bolt in, power up, and still fail to sync the set properly.
Calibration recorded for this dash number
These are the figures our file carries against the -18. Treat them as a starting point for identification, not as a specification for your set: confirm against the unit and the engine before ordering.
| Parameter | Recorded value |
|---|---|
| Engine | CAT 3512B |
| Rated speed | 1200 RPM |
| Generator output | 600 V 3-phase 60 Hz |
| Flywheel teeth | 183 |
| Magnetic pickup | 3660 Hz @ 1200 RPM |
| Timing constant on plate | 199.4 µsec |
| PMG | 240 VAC 120 Hz 1-phase |
One useful internal check: 183 flywheel teeth turning at 1200 RPM produce 3660 pulses per second, which is exactly the pickup frequency recorded. The two figures corroborate each other, which is a good sign that the calibration record is sound. It is still not a substitute for reading your own nameplate.
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 |
|---|---|
| A replacement module was fitted and the set still will not sync | Calibration mismatch: check the dash number against the engine |
| Set syncs on one engine but not on an otherwise identical one | Different calibration between the two modules |
| Sync is slow or hunts before closing | Matching loop degraded or drifting |
| Hard or rough closure when paralleling | Out-of-phase closure risk: stop and investigate before repeating |
| Intermittent behaviour that worsens with vibration | Check card-edge connectors before condemning the card |
| Generator will not sync even after a module swap | Calibration mismatch: the -18 suffix is an engine calibration, not a revision; match it to the engine before condemning hardware |
Related and confusable numbers
| Number | What it is | Substitute? |
|---|---|---|
| 0000-8500-18 | AutoSync AC II, the calibration covered by this page. | baseline |
| 0000-8500-00 | Same module family, base number. Rev C and Rev E both confirmed in service. A different calibration from the -18. | NOT a substitute |
| 0001-2657 | AC Module Auto Sync Aux II PCB: the auxiliary card inside the assembly, and frequently the item that actually failed. | Different item |
| 0001-2656-00 | 3-phase AC control module, EMD engine applications. | Different engine family |
We do not claim that any two dash numbers in this family are interchangeable. If you need to move a module between sets, send us both dash numbers and both engine configurations and we will tell you what we can and cannot confirm.
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 calibration 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 part number including the dash suffix, exactly as stamped
- Any revision letter on the card or plate
- Engine make, model, and rated speed of the set
- Generator voltage, phase, and frequency
- Flywheel tooth count and magnetic-pickup frequency if you have them
- A photo of the module plate and of the card edge, if you can take one
- Quantity and your need-by date
Condition and sourcing
RHCC 0000-8500-18 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 0000-8500-18, use the SCR Drive Fault Finder to narrow the subsystem before requesting a part.
FAQ
What is the Ross Hill 0000-8500-18?
Can I fit a 0000-8500-00 in place of a -18?
What engine is the -18 recorded against?
Is the -18 still available?
How do I tell which one I have?
Availability & Quote
For RHCC 0000-8500-18, condition is disclosed before sale. Item photographs are supplied with an actual offer.
Related
Want a quick quote for 0000-8500-18?
Fill out your contact info here, and we'll get a quote sent to you ASAP!