Mitsubishi GPS elevator shows "EF" fault handling - News - Global IC Trade Starts Here Free Join

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

SMD aluminum electrolytic capacitor

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Failure phenomenon:

Every time the elevator runs to the first floor to stop the elevator, the car interior lighting is automatically extinguished, and the elevator cannot be summoned. The fault code of the control cabinet P1 computer board is displayed as “EF” (ie “cannot start”), and the main computer board is After the reset process, the elevator resumes normal operation, but after running to the first floor, the above failure occurs again.

Processing:

1. "EF" is a very general fault indication, and there are many possibilities for causing the above-mentioned fault phenomenon, mainly including P1 elevator brainboard failure, forced speed change distance of the lower station, and weighing feedback data error.

2. Check and operate the elevator. If the forced speed change switch is normal under the test of the machine room, no problem is found.

3. Entering the hoistway and the pit to detect the respective forced speed change switches, no problems were found.

4. Detect the verticality of the forced speed change switch against the iron, and no problem was found.

5. Detecting the horizontal distance between each forced speed change switch and the collision iron, the distance is a normal range;

6. Enter the equipment room, confirm that there is no one in the car, and after the car door and the hall door have all been closed, disconnect the door machine switch to prevent the passenger from entering the car, and set the WGHO dial switch on the P1 main computer board to “0”. Bit, to cancel the weighing device (the decimal point of the digital display on the P1 main computer board will jump to the left and right), call the elevator in the machine room, and the elevator will resume normal operation, which means that the original elevator failure is caused by the weighing device. of.

7. Enter the symmetrical device of the car to check and find that the weighing device is skewed. After the adjustment, the elevator resumes normal operation.

Note: After the elevator returns to normal, the WGHO DIP switch on the P1 board should be returned to its original position.

This case reveals:

1. The weighing device feeds back the data of the main computer board. If an error occurs or conflicts with the weighing data stored in the EEPROM, the elevator will stop running. Therefore, when the elevator replaces the wire rope or the car is refurbished, it should be symmetrically placed. Make adjustments and re-write the weighing data.

2. Although this fault is not caused by the forced forced speed change, if the forced speed change deceleration distance changes due to some reason, it may also cause the same fault phenomenon as this case.