Haitian HT014: Haitian Haitian Injection Molding Machine...

Symptoms

The injection pressure has exceeded the maximum allowed during the hold phase. The controller logs an overpressure alarm and the cycle aborts to prevent mold damage.

Possible Causes

Injection pressure sensor calibration drifted high
Material viscosity higher than expected due to moisture or wrong material
Nozzle tip freeze-off causing a blockage against the mold
Mold vent blocked, preventing the melt from filling the cavity

Troubleshooting Steps

Step 1: Verify the pressure sensor reading against a calibrated reference
Recalibrate or replace the sensor if the reading is off by more than 5%
Step 2: Check the material moisture content using a moisture analyzer
Dry the material if moisture exceeds the specified maximum
Step 3: Inspect the nozzle tip for solidified plastic (freeze-off)
Clean the nozzle and verify the nozzle temperature is at setpoint
Step 4: Check the mold vents for blockage with plastic or debris
Clean the vents carefully to prevent mold damage

How to Reset

Reset: After the root cause is corrected, clear the alarm and restart the injection cycle.

Common Replacement Parts

Pressure sensor: Strain gauge, 0-200 bar, 4-20mA (Match to injection machine model)
Nozzle tip: Match to mold sprue bushing (Check for wear and freeze-off)
Moisture analyzer: Halogen, 0.01% resolution (For material moisture verification)

Frequently Asked Questions

Q: What injection pressure should I use?
First stage (fill): typically 60-80% of max. Second stage (hold): 40-60% of fill pressure. Consult the material processing guide for specific recommendations.
Q: What causes freeze-off?
Nozzle temperature too low, contact force insufficient, or cycle time too long. Ensure the nozzle temperature is 10-20C above the material melt temperature.
Q: How do I check material moisture?
Use a moisture analyzer or dehumidifier dryer readout. For PET: <0.02%. For PC: <0.02%. For ABS: <0.1%. Nylon: <0.2%.

Haitian Haitian Injection Molding Machine Error Code HT014