1. Check the status and I/O signals.
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Before inspection, ensure the motor is switched on and the mold is fully open.
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Access the IO Output page (F10 -> F4 -> Press F4 to check the gain signal pin (usually pin 09 ).
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Perform a “forced” signal output to the monitor to see if the indicator lights on the motherboard illuminate. If the lights do not illuminate, the motherboard may have faulty contacts.
2. How to swap spare contact pins on the board
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If pin 09 fails, the technician will instruct you to switch to the backup pin (e.g., pin 29 ).
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On-screen operation: Go to the configuration page (F6), enter the password 1234 , then go to page F3 to change the output port address from 09 to 29.
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Hardware procedure: Move the signal wire from pin 09 to pin 29 on the motherboard.
3. Check the wiring and connectors of the solenoid valve.
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Check the 24V power supply at the forward valve connector.
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In the video, the specific fault identified was a loose signal wire at the valve connector . After reconnecting and securely attaching the connector, the function of the valve worked normally.
4. Inspect the coil and clean the valve.
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If there is 24V power going to the valve but the alarm still doesn’t work:
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Measure the coil resistance: If there is no resistance, the coil is burned out and needs replacing.
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Valve cleaning: If the solenoid is still good (has resistance), the hydraulic valve needs to be removed for cleaning as there may be internal mechanical blockage.
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This process helps users gradually eliminate causes ranging from software and control boards to the final actuator, the hydraulic valve.