Sinamics V50 AC Drive Tripping in Power Fluctuation

I would check cable connection length and other parameters for proper installation first, then check for components that might be added...

http://www.sinomation.com/UserFiles/download/1275981752.pdf

Cable length is within 20 meter.

There is no mention of Sinamics V50 in siemens website.

Is it possible to control DC bus under-voltage? I think DC bus over-voltage can be controlled to a certain extent by using Vdc controller.

Thanks for the manual.

You might check for imbalance in supply voltage, which can be caused by having other equipment drawing on single phase in three phase system...

http://ecmweb.com/content/riding-through-unstable-power-conditions-vfds

https://support.industry.siemens.com/tf/ww/en/threads/159/?page=0&pageSize=10

https://support.industry.siemens.com/tf/ww/en/posts/sinamics-v50-drive-drive-tripping-problem-f0002-fault/106519/?page=0&pageSize=10

Voltage imbalance is well within permissible limit. 5VAC for 415VAC supply.

Article was informative.

GA from me

It is a centrifugal fan used for cooling purpose.

Check cable quality, rating along with cable length. If you have power electronics hardware work experience, replace or add high voltage Electrolytic capacitors on DC Bridge.

Wouldn't there be any bus overvoltage issue in normal condition in case we add capacitors? Moreover I am not really sure whether it is permissible to do that.

Well, one possible tricky issue is a feature called "bus regulation", which may be called something different in the Sinamics drives, but you should be able to interpolate their terminology. It is a feature usually used when a load cycles back and forth from motoring to regenerating. But if your load is not doing that, this feature can often create problems with fluctuating line supplies. It's hard to know exactly what the potential issue is sometimes, but what I usually do in a situation like this is to find that parameter and if it is enabled, disable it or if it is diabled, enable it and see if the problem goes away. If it does, you fixed it!

Do NOT however just add capacitors to the DC Bus! That is an irresponsible suggestion. Every drive must employ what is called a "pre-charge circuit" which works to limit the capacitor charging current when the drive is initialized. If you just add capacitors to the bus, the extra charging current they will attemp to draw can overwhelm the current limiting components of the pre-charge circuit and damage them, which can then result in the entire drive being damaged.

I will try to find that. thanks.