3 Phase Current draw???

[bherr]

As many on the CNC forum know I've been having problems with my BP series II Interact 4, were the spindle keeps shutting down during a cycle run. Today I got out my Fluke Amp meter and decided to measure the current draw on the three legs of the phase converter during a cycle run. Here are my readings:
Leg #1 8.1 amps
Leg #2 7.8 amps
Leg #3 3.2 amps

Now I'm no rocket scientists, but it seems to me that the third leg is way to low for current. the voltages are as follows

#1 - #2 ----- 230 volts
#2 - #3 ----- 220 volts
#1 - #3------ 225 volts these are all with the machine running a cutting cycle.

Anyone got any suggestions? or can tell me if these readings are good??

Ben

[Al_The_Man]

You didn't say wether this is a Rotary PC or static.
You may need to improve the power factor by a bit of Cap tuning.
Here is some JPG from the help I got from the Guru, Fitch Williams.
These are for a RPC.
Al.

[pointcloud]

Check your drives. HOT?

Check the compasitors, are there any leaks?

Also you can reverse the rotation on the phase converter, but you would have to change the drives on the machines too. But this can sometimes be a problem solver..

The veriances can be what you have listed.

Normally rotery phase converters do not give problems after start up has taken place..

Think its a drive...though...

[Al_The_Man]

BTW when you take a current reading, make sure you do not include any loads that are 1 phase fed from the main two 1phase supply.
IOW make sure the current reading is for 3 phase loads only, otherwise you will get an unbalanced reading.
Al.