HEPA Fan Test
The Vision Miner 22IDEX V4 has a built-in macro that tests the HEPA filter fan at five stages (off, then 25%, 50%, 75%, and 100% power) and compares measured RPM to expected ranges. Use this test after replacing the fan, when the fan sounds wrong or stalls, or after a firmware change that affects chamber ventilation.
In the Web Interface, open Macros > System > Calibration > QC > Tests > Hepa Fan Test.
Before you begin – safety and risk
Read the Safety – Before You Begin article to understand the hazards involved in working on the Vision Miner 22IDEX V4 – including electrical, thermal, mechanical, and chemical risks. All procedures in this wiki are provided as recommendations only. By choosing to follow any procedure, you do so at your own risk.
When to use this test
- After replacing the HEPA fan – confirm the new fan is connected and reaches target RPM at each step.
- When you suspect a fan fault – loud, vibrating, intermittent, or apparently not spinning; the macro shows whether RPM tracks each commanded level.
- After a firmware update – if HEPA behavior changed, the test separates firmware control issues from hardware.
Running the test
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Open the printer Web Interface in a browser.
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Go to Macros > System > Calibration > QC > Tests > Hepa Fan Test.
- Click the macro. A dialog asks whether to start the test (Test, Skip, Cancel).
- Choose Test. The macro runs each stage automatically: it sets a speed, waits about 10 seconds for RPM to stabilize, then checks the reading against the expected range.
What the test checks
The macro exercises Fan 7 in firmware at these levels:
| Speed | Expected RPM | If it fails |
|---|---|---|
| 0% (off) | 0 | Fan not stopping – electrical fault, stuck rotor, or control issue |
| 25% | 3,300–3,700 | Low-speed wiring or motor problem |
| 50% | 6,400–6,700 | Mid-speed underperformance |
| 75% | 9,700–9,900 | Higher-speed strain – bearing wear or electrical fault |
| 100% | 14,000–14,700 | Cannot reach full speed – replacement often needed |
When a stage passes, you should see a confirmation such as Actual Fan speed is correct.
If a speed test fails
If RPM is outside range, you get The fan speed does not match the set value. Please check the fan. with Stop or Continue Test.
- Check the fan connector. Power off the printer, wait 60 seconds, then confirm the fan cable is fully seated on the expansion board.
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Listen for bearing noise. Grinding, scraping, or rattling usually means worn bearings – plan replacement even if RPM sometimes passes.
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Re-run the test after reseating the connector. If it still fails, replace the fan. See HEPA fan replacement.
Test completion
When all stages pass, the macro reports completion and returns the fan to normal thermostatic control (chamber temperature drives speed).
No further action is required unless you are still chasing noise or vibration outside RPM limits.
FAQ
Troubleshooting
Support
If you could not find an answer here, reach out to our support team.