Description
Key Technical Specifications
- Product Model: K9202
- OEM Part Number: 996920202
- Manufacturer: HIMA (Germany)
- Product Type: Cabinet Cooling Fan Module
- Application: HIMA Planar4, HIMax, HIQuad Racks
- Function: Forced Air Convection / Thermal Management
- Design: Modular, Hot-Swappable Cartridge
- Noise Level: Low-Noise Industrial Grade
- Reliability: High MTBF, Vibration Resistant
- Maintenance: Tool-less Replacement (Typical)
Product Introduction
Silicon hates heat, and safety PLCs hate downtime. The HIMA K9202 (996920202) is the dedicated fan module designed to keep the QMR (Quadruple Modular Redundant) processors in Planar4 and HIMax systems from cooking themselves. It’s not just a fan; it’s a precision airflow cartridge that slides into the rack to maintain the strict thermal envelope required for SIL3 safety integrity.
Bottom line—this is a wear item. Bearings fail, dust cakes on, and airflow drops. The K9202 is engineered for hot-swapping, meaning you can replace a failing unit without powering down the safety system or tripping the process. Just verify the airflow direction arrows on the chassis; installing it backward creates a hot pocket that will trigger thermal alarms faster than you can grab a screwdriver.
Troubleshooting Quick Reference
| Fault Symptom | Probable Cause | Relevancy | Quick Check | Fix / Action |
|---|---|---|---|---|
| High Temp Alarm | Fan Failure / Clogged Filter | 90% | Check LED status / Airflow feel | Replace K9202; clean intake filter |
| Intermittent Fan Stop | Loose Backplane Pin | 60% | Reseat module firmly | Clean contacts; check locking lever |
| Excessive Noise | Bearing Wear / Debris | 80% | Listen for grinding/rattle | Replace K9202 immediately |
| No Power to Fan | Fuse / Backplane Power | 50% | Measure 24V at socket | Check rack PSU; inspect backplane pins |
| System Warning | Missing Module | 40% | Verify physical presence | Slide K9202 in until click |
Application Scenarios & Pain Points
SIL3 Safety Instrumented Systems:
HIMA systems run hot because they run four processors in parallel. The is critical for maintaining the <55°C internal rack temp required for long-term electrolytic capacitor life. If your control room AC fails, this fan is your last line of defense. Don’t let it be the single point of failure.
Harsh Environment Installations:
In refineries or offshore platforms, conductive dust and oil mist are the enemy. The pulls this gunk directly through the backplane. If you’re in a dirty environment, inspect these fans quarterly. A clogged doesn’t just overheat; it acts as an insulator, trapping heat against the CPU.
Preventive Maintenance Swaps:
Fans have a mechanical life, usually 3-5 years in continuous duty. Don’t wait for the thermal alarm. Schedule replacements during turnarounds. The cost of a fan is nothing compared to the cost of a forced SIS shutdown due to a thermal trip.
Real-World Case:
Operator at a gas plant reported “Cabinet Over Temp” on a redundant HIMax rack. They swapped the CPU, thinking it was a sensor fault. No change. Finally pulled the ; the fan was spinning, but the blades were coated in 2mm of polymerized oil, moving zero air. Replaced the , temp dropped 15°C in 2 minutes. Lesson: Spinning ≠ Cooling. Check the blades.
HIMA 996920202 K9202
Compatible Replacement Models
✅ Drop-in Replacement: (996920202)
Exact match. Slide-in, lock, done. Verify the 996920202 number; some older revisions had different blade pitches.
⚠️ Software Compatible: K9202B
Updated revision. Same form factor, potentially higher airflow or better bearing seal. Plug-and-play, but check the HIMA manual for any updated thermal setpoints in the configuration.
❌ Hardware Incompatible: K9203
Different physical dimensions or connector layout. Do not force; you will bend the backplane cooling pins.
