Combining CMC16 200-530-025-014 with MPC4 200-510-017-017 in one Vibro-Meter VM600 rack gives a critical rotating machine two different functions from the same sensor signals. MPC4 executes protection trips before damage occurs. CMC16 captures high-resolution dynamic data for vibration diagnostics and predictive maintenance. This article explains what each card does, how they work together, and what to check before sourcing or installing.
How the two cards divide the machine protection job
On a critical pump, compressor, or turbine, protection and condition monitoring are not the same task.
- Protection must compare signals against setpoints and shut the machine down immediately.
- Condition monitoring must record spectral, orbit, phase, and trend data so maintenance can find the root cause.
MPC4 200-510-017-017 handles the first task. CMC16 200-530-025-014 handles the second. Running both in the same VM600 rack avoids the need for two separate systems.
What CMC16 200-530-025-014 does
CMC16 is a condition monitoring card. It provides up to 16 dynamic input channels for signals from proximity probes, accelerometers, velocity sensors, and similar transducers.
Typical CMC16 functions include:
- Vibration spectrum and orbit plot acquisition
- Phase and bode data during startup or coastdown
- Bearing condition trending
- Shaft position monitoring
- Slow-roll and transient data capture
CMC16 does not execute machine trips. Its value is diagnostic. When a machine trips, CMC16 data shows what happened before the trip, which helps distinguish unbalance, rub, surge, misalignment, or bearing damage.
What MPC4 200-510-017-017 does
MPC4 is a machinery protection card. It is a 4-channel protection module used for radial vibration, axial thrust, differential expansion, eccentricity, and speed protection.
Its main functions are:
- Configurable alarm and danger setpoints
- Direct relay outputs for alarm and trip
- Independent hardware protection path
- Trip multiplication and time delay control
- Compatibility with external trip relays such as RLC16 200-570-101-013
MPC4 is designed to protect the machine even if the monitoring software or communication fails. That hardware independence is the key difference from CMC16.
How they work together in one VM600 rack
A typical installation uses both cards in the same 204-040-100-011 rack or 204-040-100-012 backplane configuration.
Example: gas compressor with high radial vibration.
- MPC4 compares radial vibration against the danger setpoint.
- If the signal exceeds the limit, MPC4 drives the trip relay and shuts the compressor down.
- CMC16 has already stored pre-trip data showing whether the vibration rise was sudden rub, progressive unbalance, or surge-related instability.
That combination reduces repeat failures. Protection stops the incident. Condition monitoring tells you what to fix.
Sensor and wiring considerations
Use the correct transducer type for each card.
- TQ402 111-402-000-012 or TQ402 111-402-000-013 proximity probes for shaft vibration and thrust
- TQ412 111-412-000-012 or TQ412 111-412-000-013 for restricted-space or high-temperature applications
- CA202 144-202-000-203 or CA202 144-202-000-205 accelerometers for casing vibration
- CP515 143-515-000-111 for dynamic pressure signals
- EA402 913-402-000-012 or EA402 913-402-000-013 extension cables with proper shield
Key wiring rules:
- Keep shield drain connected at one end only.
- Verify probe gap voltage using 204-215-000-101 calibrator.
- Do not parallel sensor signals to both cards without checking input impedance and manufacturer guidance.
- Route signal cables away from power and inverter cables.
Configuration rules that reduce false trips
Before commissioning CMC16 and MPC4 together, check these points.
- Map each CMC16 channel to the correct machine point. Wrong mapping creates false diagnostics.
- Set MPC4 alarm and danger values from machine OEM data or API 670 guidance.
- Apply trip time delay only when the process requires it.
- Confirm CPUM firmware compatibility. Use CPUM 200-595-067-114 or a confirmed later version.
- For relay outputs, wire RLC16 contacts according to the safety logic, not as a convenience.
- Confirm that MPC4 has a valid hardware trip path. Software-only alarming is not protection.
Application examples by industry
| Industry | Machine | CMC16 role | MPC4 role |
|---|---|---|---|
| Oil & gas | Gas compressor | Orbit, bearing wear trending | Radial vibration and thrust trip |
| Power generation | Steam turbine | Startup bode, eccentricity trend | Eccentricity and thrust protection |
| Petrochemical | Centrifugal pump | Bearing defect spectrum | Casing vibration trip |
| Paper | Dryer bearing | High-frequency envelope analysis | Radial vibration protection |
| Steel | Gearbox | Gearmesh and bearing diagnostics | Overall vibration alarm |
This combination fits any plant where a critical machine needs both continuous diagnostics and hard shutdown logic.
Spare part selection and compatibility checks
When sourcing CMC16 200-530-025-014 and MPC4 200-510-017-017, confirm these before ordering.
- Exact model code. Suffixes after 200-530-025 or 200-510-017 affect input type, relay outputs, and hardware revision.
- Rack compatibility with 204-040-100-011 and backplane 204-040-100-012.
- CPUM firmware version. A newer module may not work with an old firmware image.
- Existing module versions in the rack. Mixed revisions sometimes work, but verify with the supplier.
- For MPC4 replacement, confirm relay output contact configuration matches the existing trip circuit.
A practical spare strategy:
- Keep one MPC4 spare per installed protection loop.
- Keep one CMC16 spare for every three to five monitoring racks.
- Keep sensor and cable spares on the same shelf, because sensor failure is a common cause of false trips.
Common installation mistakes
These mistakes cause avoidable trips or missed diagnostics.
- Installing CMC16 alone on a machine that needs protection.
- Replacing MPC4 with a different suffix without revalidating trip logic.
- Using long unshielded sensor cables, which introduces noise into both cards.
- Setting MPC4 trip thresholds from guesswork instead of machine OEM values.
- Mapping CMC16 channels by physical slot instead of machine point.
- Leaving the OK relay unwired or bypassing the trip path during commissioning.
- Ignoring CMC16 data storage and communication status until after a trip, when the pre-trip data is already lost.
Fault symptoms and quick checks
| Symptom | Check first |
|---|---|
| CMC16 data loss | CPUM communication, backplane slot contact, storage capacity |
| MPC4 false trip | Sensor gap voltage, threshold setting, cable drift, shield damage |
| Noise on CMC16 spectrum | Grounding, shield termination, cable routing near inverters |
| MPC4 no relay output | RLC16 wiring, trip multiplier, OK relay status |
| CMC16 channel offline | Channel initialization, signal input type setting |
| Both cards show intermittent fault | Rack grounding, power supply, backplane connector seating |
Before replacing a card, always capture the fault code and check the sensor loop first. Inexpensive sensor and cable problems are more common than module failures.
FAQ
Can CMC16 trip the machine?
No. CMC16 is a condition monitoring card. MPC4 provides the machine protection trip.
Can I install CMC16 without MPC4?
Yes, but only for condition monitoring. A critical machine should still have a hard protection loop from MPC4 or an equivalent protection card.
How many channels do these cards support?
CMC16 supports up to 16 dynamic channels. MPC4 200-510-017-017 is a 4-channel protection card.
Do CMC16 and MPC4 share the same sensor signal?
In many VM600 configurations they can, but the wiring method must be checked. Never simply bridge terminals without confirming input impedance and signal routing.
What should I provide to confirm compatibility before buying?
Provide the full model code, CPUM firmware version, rack model, and a photo of the existing backplane slot if available.
CMC16 200-530-025-014 + MPC4 sourcing support
Joyoung International Trading Co., Limited supplies CMC16 200-530-025-014, MPC4 200-510-017-017, related VM600 rack modules, sensors, and relay cards. We support system matching, firmware compatibility checks, and fast delivery for critical spares.
For stock confirmation or technical consultation, contact Li Hao at [email protected] or +86-181-5013-7565. Browse Vibro-Meter VM600 spare parts at Vibro-Meter VM600 spare parts.
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