DS3800HAFA1B1C GE Turbine Control | Coated Heat Sink Fan Module

Description

Product Core Brief

• Model: DS3800HAFA1B1C
• Brand: GE (General Electric)
• Series: Mark IV Speedtronic Turbine Control System
• Core Function: Provides coated active cooling fan assembly with Revision C control firmware for Mark IV heat sinks.
• Type: Heat Sink Fan Assembly
• Key Specs: Heat sink fan; 24 VDC; conformal coated; Rev C fan control; forced-air cooling; VME form factor; LED status.
• Condition: New Original (New Surplus) — not refurbished.

Key Technical Specifications

• Function: Active cooling fan assembly
• Fan Voltage: 24 VDC
• Fan Current: 0.2 A
• Airflow: 20 CFM
• Material: Aluminum
• Cooling Type: Forced-air
• Firmware: Revision C (improved fan control, temperature monitoring)
• Conformal Coating: Acrylic-based polymer coating on PCB (both sides)
• Mounting: VME rack
• LED Indicators: Module status (green), fan status (green/red)
• Operating Temperature: –30 to +65 °C ambient
• Humidity Resistance: 95% non-condensing (coated PCB)

Quality Inspection Process (SOP Transparency)

This is what every DS3800HAFA1B1C goes through before it ships:

Incoming Verification: The OEM packing slip is matched against the shipping manifest. Visual inspection includes checking the GE holographic label (or classic Speedtronic logo), verifying the heat sink fan has no dents or damage, and examining the fan blades for any obstructions or damage. The conformal coating is inspected for uniformity under a magnifying glass.

Live Functional Test: The heat sink fan is installed in a test rack with a known-good module and verified to fit correctly. The fan is powered on and verified to spin correctly. Thermal performance is checked by running the module at full load and measuring the heat sink temperature—must be within spec.

We test the Rev C fan control firmware by varying the module temperature and verifying the fan speed adjusts correctly. We test the temperature monitoring by applying a heat source and verifying the module detects the temperature change.

Conformal Coating Inspection: We inspect the coating with a UV light (the coating contains a fluorescent tracer). Any spots that don’t fluoresce indicate missing coating. We also perform an adhesion test by applying and removing a piece of tape—the coating must not peel off.

Electrical Parameters: A Fluke 1587 insulation tester measures isolation between the fan and the backplane. We look for >20 MΩ at 500 VDC. Power consumption is measured at full fan speed—must be <5 W.

Mechanical Inspection: The heat sink fan is inspected for proper fit and alignment. The fan blades are inspected for damage.

Final QC & Packaging: The QC report lists the fit test, fan operation, Rev C fan control test, conformal coating inspection, and thermal performance. The heat sink fan goes into a new anti-static bag with a tamper-evident seal, then into a double-walled carton with foam inserts. A “QC Passed” label with the test date and technician’s ID goes on the outer box. All test data and photos are available on request.

Field Replacement Pitfalls

The DS3800HAFA1B1C is the coated heat sink fan with Rev C control. Here’s the field-tested list:

Conformal Coating Damage
The conformal coating can be damaged by excessive heat, chemicals, or physical abrasion. ❗ Use only isopropyl alcohol (70% max) for cleaning. Don’t use acetone, MEK, or other aggressive solvents.

Fan Failure
The HAFA1B1C’s fan can fail over time. ❗ Check the fan regularly for noise or vibration.

Rev C Firmware Compatibility
The Rev C fan control firmware requires CPU firmware v3.0 or later. I had a plant where a HAFA1B1C was installed with a CPU running older firmware—the temperature monitoring didn’t work. ❗ The Rev C HAFA1B1C requires CPU firmware v3.0 or later. Check your CPU’s firmware version.

Airflow Obstruction
The HAFA1B1C relies on forced-air cooling. ❗ Ensure the fan has adequate airflow.

Fan Voltage
The HAFA1B1C’s fan is 24 VDC. ❗ Use 24 VDC fans only.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

The DS3800HAFA1B1C is a legacy heat sink fan assembly with coating and Rev C firmware. Refurbishment risk is moderate.

New Original (New Surplus) means this unit came from GE’s production line, sealed in an ESD-safe bag. The conformal coating is fresh and uniform, the Rev C firmware is genuine, the fan is new, and the module has zero operating hours. The serial number traces to GE’s production database.

Refurbished risk: The fan may be worn or damaged, and the conformal coating may be damaged. I saw a refurbished HAFA1B1C in a plant that had a noisy fan—the bearings were worn. The refurbished fan cost 180; the new surplus unit was 280. The module overheated and failed.

Real cost: A failed fan can cause a module to overheat and fail. The cost of a module failure is tens of thousands of dollars. A new surplus fan is cheap insurance.

What we provide: We include a photo of the OEM packing slip. The anti-static bag is sealed with a tamper-evident label. The QC test report lists the fit test, fan operation, Rev C fan control test, conformal coating inspection, and thermal performance. You get a 12-month warranty.

Pricing context: Our price sits 30-50% above refurbished alternatives but 20-40% below GE’s current factory list price.

Performance Benchmarks & Test Results

Measured during our QC test. Conditions: test rack with a Mark IV backplane simulator and a CXCIA CPU module (firmware v3.0), 24.0 VDC supply (Fluke 8845A), ambient 24 °C.

• Fit Test: Heat sink fan fit correctly on the module.
• Fan Operation: Fan spun correctly. No noise or vibration.
• Rev C Fan Control Test: Fan speed adjusted correctly with temperature variation.
• Temperature Monitoring Test: Temperature sensor responded correctly to heat application.
• Conformal Coating Inspection: Uniform coating coverage under UV light. Tape adhesion test passed.
• Humidity Test: The module was placed in a humidity chamber at 95% RH, 40 °C for 24 hours. After the test, insulation resistance remained >20 MΩ at 500 VDC.
• Thermal Performance: Module temperature stabilized at 45 °C. Heat sink temperature stabilized at 35 °C. Within spec.
• Airflow: 20 CFM measured. Within spec.
• Power Draw: 4.5 W at full fan speed. Within the 5 W max spec.
• Isolation Resistance (Fan to Backplane): Measured 40 MΩ at 500 VDC—well above the 10 MΩ minimum.
• MTBF (Published): GE’s datasheet listed 110,000 hours at 40 °C for the HAFA1B1C. Based on field data, expect 10-15 years of service under normal conditions.

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