OTIS OVF30 Frequency Inverter is the earlier model used in OTIS 300VF control system. Due to it is over 10 years since from used begin, so there is relatively high damage in using ABA26800XU1 / ABA26800XU2. Now, ElevatorVip company has repaired so many ABA26800XU1 and ABA26800XU2, and then we hope show the experience of easy to damage and not easy to find failure to share with you.
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Failure No.1: Power on normally, and the words ‘X04A’ displays on the frequency converter motherboard, the UDX indicator light keeps turning on and off continuously, at the same time, UDX relay keeps absorption status continuously, and also BRK indicator light is off.
Solution No.1: The failure is usually caused by a problem with IGBT drive signal circuit of the driver board not be captured, which is caused by the increase of resistance value of R118-R124=499Ω. Replacing the broken resistance can solve the problem.
Failure No.2: Power on normally, and the words ‘X04A’ displays on the frequency converter motherboard, the UDX indicator light keeps turning on and off continuously, at the same time, UDX relay keeps absorption status continuously, and also BRK indicator light is on shortly and then goes off.
Solution No.2: This fault is generally caused by the increase of the resistance value of current sampling resistance in the current detection loop. The resistance value of R146, R149, R152 and so on becomes larger, so replace all the bad resistances then will it goes well.
Failure No.3: Power on normally, the words ‘!04A’ displays on the frequency converter motherboard.
Solution No.3: The fault should be verified with Elevator Service Tool (Elevator Testing Tool), the fault code ‘M4-2-1’, which means ‘UDX not picked NC’, the UDX NC is poor contact or bad action, finally detect the resistance in R78, R75, R77 and R83, to confirm it is normal or not, if it is damaged, just replace it then will be fine; the another situation is ‘UDX not picked NO’, which means R78 resistance is damaged.
Warm Reminder: During check and repair ABA26800XU1/XU2 Motherboard of OTIS OVF30 Frequency Inverter should be used Elevator Service Tool (Elevator Testing Tool), which will find the failures quickly.
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