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one cycle fault

Created by: FEPD at: 7/11/2014 5:38 PM (11 Replies)

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7/11/2014 5:38 PM	Rate (0)
FEPD Member Joined: 6/6/2012 Last visit: 9/21/2024 Posts: 4 Rating: (0)	Good morning: I have a VFD GEN4 of 400 HP to 4.16 KV,when i aplied 4.16Kvto the 30 seconds next the vfdpresent the one cycle fault. Next of check the xformer windingsand cells i found all normal, thenI changed the parameters 7080 and 7081 to 0.0005 and 30%and the faultdisappeared. I start up the vfd with motor empty without problem but in thestop the one cycle fault again appeared. I appreciate your help with it

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7/14/2014 4:08 PM	Rate (0)
N. Vijay Silver Member Joined: 3/17/2013 Last visit: 8/25/2024 Posts: 481 Rating: (43)	Hi Is this a old drive ruunning or new commissioning? As explained in manual, it is related to excessive reactive current on input side in the rare event of secondary faults. try to reduce 7080 and increase 7081. After Stop command again same fault coming or the fault is different like 'excess loss' Upload the event,fault and history logs Regards, Vijay

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7/14/2014 4:38 PM	Rate (0)
FEPD Member Joined: 6/6/2012 Last visit: 9/21/2024 Posts: 4 Rating: (0)	Good morning: I appreciate your help, we write to Brasil factory and they answered that was necessary set the input current ofVFD because the xformer power was 500 Hp, 61 Aand the power of VFD was 400 Hp, 49 A.We made the adjustment and thefault disappeared. Best regards

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This contribution was helpful to 1 thankful Users N. Vijay

9/23/2014 12:04 PM	Rate (0)
boyn84 Posts: 21 Rating: (0)	Good day, We fased with a same problem: when ramping up the synchronous motor 2,2MW (rated current 251A) after 25Hz an error occurs: InputOneCycle (Input/output current does not rise above 100 A). We performed the following steps to solve this problem: - Changed parameters: reduced ID7080, decreases and increases ID7081 - Current drive nameplate - 257a, current transformer nameplate - 295A, have changed the ID2020 to 295 - Initially tried to parameter values 3110, 3120, 3130, referred in the document A5E03017950 test with synchronous motor, also tried on the values of these parameters by default. We could not get a sucsess. What else can we do to solve this problem? With best regards
boyn84 Posts: 21 Rating: (0)
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9/25/2014 6:42 PM	Rate (0)
FEPD Member Joined: 6/6/2012 Last visit: 9/21/2024 Posts: 4 Rating: (0)	Hi, do you lead parameter 7080 and 7081 in factory default? and next you set the input current of VFD? Idid this steps and the faultONE CYCLE disappeared, but nextwhen i startup the motor the Fault Excessive Drive Loss appeared.Then i set the scaler of the input currentand the fault dissapeared. Regards,

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9/26/2014 5:38 AM	Rate (0)
boyn84 Posts: 21 Rating: (0)	Good day I should check again your steps. What the value of input current scaler did you set? With best Regards
boyn84 Posts: 21 Rating: (0)
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10/16/2014 6:44 PM	Rate (0)
liul_sharp Posts: 2 Rating: (0)	Hi, You can check the power supply of the Hall, make the +/- 15VDC is no offset. The error of +/-15VDCmustsmaller than+/- 0.02VDC.
liul_sharp Posts: 2 Rating: (0)
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10/28/2014 2:30 PM	Rate (0)
N. Vijay Silver Member Joined: 3/17/2013 Last visit: 8/25/2024 Posts: 481 Rating: (43)	Hi What is the Firmware with your CPU Regards, Vijay

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10/28/2014 6:15 PM	Rate (0)
boyn84 Posts: 21 Rating: (0)	Good day Finally we finded out the problem with the InputOneCycle. The St.Petersburg Robicon manufacturer adviced us to change the polarity on to phase B input CT . Before changing wiring was correct and corresponded to documentation, but after changing the problem has disappeared. We successfully tested VFD with full load and performed the SyncTransfer . Thank you for your help With best regards
boyn84 Posts: 21 Rating: (0)
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This contribution was helpful to 1 thankful Users N. Vijay

1/13/2015 12:01 PM	Rate (0)
Gennadiy Posts: 29 Rating: (1)	Boyn 84, I hope you have correct readings in Debug tool - Advanced, after changing the wiring! Otherwise your drive works without protection! Is the drive located in Komsomol'sk-Amur? I want to add one more thing to OneCycle protection. In my experience, in smaller drives (200-400KW) working with high input voltage (110-115% of rated) and with small loador just in idle state, the transformer can be oversaturatedand may takehigh reactive current. in this case, the only way to preventstopping with fault is to change level 8 (hidden) parameter - reactive current treshold.
Gennadiy Posts: 29 Rating: (1)
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