Hi members, i am in need of some help on a 380v CNC Router, where it goes completely haywire with Grid 380Volt, sometimes spiking to 395Volt. 
Municipality cannot seem to get it right. 
the CNC runs fine, when running under half speed. 
i managed to check the units’ internal transformer and found that it outputs around 241Volt, to the electronics side of the CNC. 
My question is: wil an Inverter fix this issue, or would i need a Power Transformer/stabiliser, to keep outgoing power stable. 

TIA 

15 minutes ago, Ollie said:

Hi members, i am in need of some help on a 380v CNC Router, where it goes completely haywire with Grid 380Volt, sometimes spiking to 395Volt. 
Municipality cannot seem to get it right. 
the CNC runs fine, when running under half speed. 
i managed to check the units’ internal transformer and found that it outputs around 241Volt, to the electronics side of the CNC. 
My question is: wil an Inverter fix this issue, or would i need a Power Transformer/stabiliser, to keep outgoing power stable. 

TIA 

In order to provide some practical to do some questions. 

What is the power used by the whole unit at maximum speed? 

In which part of the country are you? 

Does the CNC work mostly during sunlight hours? 

Indicate what roof area and direction do you have for panels? 

As our standard voltage in SA is 230/400V +|- 5%. Thus your unit should not be affected if all is well with all controller functions. 

The answer is yes if used via the correct mode/inverter to not just pass the grid voltage to the CNC.

Also another solution without going the inverter route to provide stable power. 

More about it after answers above. 

Thanks for the swift reply Scorp007. 

We are based in Gauteng. 
The unit is a 3phase CNC Router, with it’s own built in transformer, to run SW Computer and lights at 220v. 
the router arm motors and vacuum pumps runs off 380v. I need to check, but it seems to draw about 16Amps. The total size of the unit with bed is approx 4m x 6m and is used to cut & drill Cupboard panels.  

I believe it is the continous fluctuation/spikes, that create the problems
ideally it would be simpler if i could just stabilize the incoming voltage. 
 We have about 10 different machines in the shop, but this is the critical component to the business running fluently. It was fine, up untill about 2 weeks ago, when municipality worked on the power outside our building, where the main sub for our area is located. 
thanks

10 minutes ago, Ollie said:

Thanks for the swift reply Scorp007. 

We are based in Gauteng. 
The unit is a 3phase CNC Router, with it’s own built in transformer, to run SW Computer and lights at 220v. 
the router arm motors and vacuum pumps runs off 380v. I need to check, but it seems to draw about 16Amps. The total size of the unit with bed is approx 4m x 6m and is used to cut & drill Cupboard panels.  

I believe it is the continous fluctuation/spikes, that create the problems
ideally it would be simpler if i could just stabilize the incoming voltage. 
 We have about 10 different machines in the shop, but this is the critical component to the business running fluently. It was fine, up untill about 2 weeks ago, when municipality worked on the power outside our building, where the main sub for our area is located. 
thanks

From what we know my 1st step would be to create a stable supply via a pure sine inverter running from battery purely for the control system with the electronics. Low power unit. This would be the 240V AC that you mentioned. A cheaper solution would be to provide 230V AC from a voltage stabiliser. I guess both these units need not be more than 1.5kW but this is a very wild estimate. Measurements need to be taken to confirm power rating. This area will be more prone to fluctuations based on my limited exposure to them. The main AC motors should not give any hiccups. 

Just my view based on what is mentioned without actually measuring or seeing the type of problems on the unit.