Some Valuable Experiences in Maintenance Methods of OTIS OVF30 Frequency Inverter Board (ABA26800XU1 and ABA26800XU2)

The model of OTIS OVF30 Frequency Inverter is an early equipped in the 300VF control system of OTIS elevator. Due to the service life is longer (at least 10 years), there has a high damage rate of ABA26800XU1(or XU2) in the frequency inverter. ElevatorVip has accumulated rich maintenance experiences in the past few years, now we are showing the experiences of maintenance and how to troubleshoot issue to everyone as below:

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Failure 1: Power on works well, fault code: ‘X04A’ displays on the frequency inverter board, the UDX light flash alternatively, UDX relay switch turn on and off alternatively, and BRK light doesn’t work.
Fault Point: This fault is generally caused by an issue in drive signal return circuit of IGBT. Generally, it is caused by that R118-R124=499 ohmic resistance is increased, please just replace the broken resistance, which works well.

Failure 2: Power on works well, fault code: ‘X04A’ displays on the frequency inverter board, the UDX light flash alternatively, UDX relay switch turn on and off alternatively, and BRK light is on once, then off.
Fault Point: This fault is generally caused by the limit value of current sampling resistor is increased in the current checking circuit. Usually, the resistance value of R146, R149, or R152 is increased, please replace it, which works well.

Failure 3: Power on doesn’t work properly, fault code: ‘!04A’ displays on the frequency inverter board.
Fault Point: The OTIS Elevator Test Tool (TT) is needed to troubleshoot the fault, if there displays ‘M4-2-1’ on the TT, which the fault is ‘UDX not pickd nc’ means UDX replay NC doesn’t work normally or action incorrect, in final it was found that the resistors in R78, R75, R77, and R83 had deteriorated, after replacing the deteriorated resistors, it started normally. If the fault code is ‘UDX not pickd no’ means the R78 is broken.

Tips: The OTIS Test Tool (Part number: GAA21750AK3) is important tool during maintenance of ABA26800XU1 and ABA26800XU2, which is useful tool according to fault code to check the fault point at your jobsite.

How to check and repair ABA26800XU1/XU2 Motherboard of OTIS OVF30 Frequency Inverter?

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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