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Phone: +86 16626708626Description
Key Technical Specifications
- Application: Channel unit card for AUTRONICA KM-2 fault alarm and monitoring systems (engine room alarm, machinery monitoring).
- Part Number: 7251-044.0001 (also seen as 7251-044.0000).
- System Compatibility: KM-2 alarm panels; commonly deployed with KMG-200 (group alarm), KME-210 (action alarm), KMK-200 (acknowledge/test) modules.
- Function: Provides monitored input channels for sensors/switches (e.g., pressure, temperature, level, flow) and conditions signals for group/action alarm logic.
- Channel Count: Typically 8–16 channels per card (KM-2 channel units commonly in this range; exact count depends on revision and wiring).
- Input Type: Dry-contact / switch inputs; 24 V DC monitoring typical for KM-2 family (verify against panel wiring diagram).
- Logic Levels: Open/closed contact detection with debounce/delay settings (Dly A / Dly B parameters seen on labels).
- Power Supply: Module runs from panel 24 VDC rails; KM-2 cabinets typically 24 VDC control voltage.
- Current Consumption: Low (channel cards are signal-conditioning; bulk draw is in power/relay modules).
- Environmental: Marine ambient −5 to +55 °C typical for KM-2 cabinets; IP30–IP40 for control equipment.
- Mechanical: PCB module format for KM-2 cabinet/backplane; screw-terminal wiring per installation handbook.
- Weight: ~100–120 g per card (as listed by marine suppliers).
- Certifications: Marine approvals (DNV/GL/ABS) on KM-2 system level; card-level compliance per OEM test reports.
Product Introduction
The AUTRONICA KMC-234 (7251-044.0001) is a channel unit PCB used inside KM-2 fault alarm and monitoring systems to condition and monitor discrete sensor inputs (pressure, temperature, level, flow switches) for engine room and machinery alarm panels.. It feeds conditioned alarm states into group/action alarm modules (KMG-200, KME-210) and acknowledge/test units (KMK-200, KRR-1)..
Field teams keep KMC-234 cards as critical spares for legacy KM-2 installations because a single failed input channel can mask machinery faults or cause nuisance alarms.. We stock verified units (New Surplus or Refurbished) and can supply terminal photos and wiring references on request..
KMC-234
KMC-234
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| One channel always shows alarm (or never alarms) | Input stage failed; wiring open/short; debounce mis-set | ✅ High | Measure voltage at input terminal with sensor open/closed; compare to adjacent good channel; check Dly A/Dly B settings . | Repair wiring; adjust delays; if channel still stuck, replace KMC-234. |
| Multiple channels erratic; panel nuisance alarms | 24 V rail sag; backplane contact issue; ESD damage | ✅ Medium | Measure 24 VDC at module rails under load; reseat card; inspect for burnt components . | Stabilize power; clean contacts; replace module if multiple channels fail. |
| Panel shows “Channel Fault” on KMC-234 | Internal monitoring circuit fault; firmware/config mismatch | ✅ Medium | Swap with known-good KMC-234; if fault follows card, it’s hardware . | Replace KMC-234; verify configuration matches panel type. |
| Alarms not acknowledged; test button no effect | Issue upstream (KMK-200/KRR-1) not | ❌ Low | Test acknowledge/test functions at KMK-200/KRR-1; verify wiring to bell/sounder . | Focus on acknowledge/test modules; rarely the cause. |
| Intermittent alarms after vibration (marine) | Terminal screws loose; card not fully seated; connector fatigue | ✅ Medium | Inspect terminal tightness; reseat card; check backplane pins . | Re-terminate; add lock washers; replace module if backplane damaged. |
❗ Before swapping, photograph terminal wiring (sensor inputs, 24 V, 0 V), the card label (, 7251-044.0001, Dly A/B values), and the panel’s channel map. Send those plus a description of the sensor type (N/O vs N/C) and we’ll confirm the exact wiring map.
Frequently Asked Questions (FAQ)
Q: Is the hot-swappable in a live KM-2 panel?
A: No. Treat it as non–hot-swap. Power down the panel or at least disable the 24 VDC to the channel rack before pulling the card. I’ve seen panels lock up when channel cards are yanked live.
Q: Can I substitute 7251-044.0000 for 7251-044.0001?
A: Often yes, as they’re the same family with minor revision changes. Always verify the delay settings (Dly A/Dly B) and channel mapping match your panel config before swapping.
Q: How many channels does this card provide?
A: Typically 8–16 channels per card depending on revision and wiring. Check your panel’s channel map and the card label (some list “Dly A 255, Dly B 255” for max delay).
Q: What input types does it support?
A: Dry-contact / switch inputs (N/O or N/C) from machinery sensors (pressure, temperature, level, flow). The card conditions these for group/action alarm logic in KM-2 panels.
Q: What voltage does it run on?
A: 24 VDC control voltage typical for KM-2 cabinets. The module itself is low-power; bulk draw is in power/relay modules.
Q: Why is pricing lower than factory-new?
A: KM-2 is a legacy marine platform; genuine new cards are scarce. Our stock is surplus or refurbished OEM hardware, priced to reflect availability while maintaining traceability and testing. If you need exact delay settings or channel mapping for a specific panel, tell us your KM-2 cabinet number and we’ll match it.
Q: Can I use this in AutroSafe or BS-100 fire panels?
A: No. is specific to KM-2 machinery alarm systems. AutroSafe and BS-100 use different module families (BSE/BSJ/BSB for I/O; BSA/KDM for CPU) .
