Dear All
Tell me the set up details for doing Motor current Analysis in SKF CMVA 60.

Regards
Guru

Hi, Guru!!
Better place for your question is SKF @ptitude Exchange Forum . It is not easy involve someone in MCSA without reading User Manual for instrument CMVA60. I have worked with CMVA60 for 2 years and I found 12 motors with rotor bars problem. I will try to explain you my setup for MCSA:
1. Motor must be loaded at > 75% of rated full load and its HP rating must be > 10HP (7,5 kW)
2. In setup for current analysis :
In field Type: choose Current Zoom
In field Line frequency :you choose frequency in your country 50 or 60 Hz
In field Full scale :you choose predictable full load of motor
In field Input :you choose the sensitivity of the current clamp when you directly measuring the motor line current. If you measure motor current from line current transformer ,for example, if the transformer is 100 / 1 A , then the normal current clamp sensitivity must be changed from 1mV/Amp to 0,01 mV/Amp.
In field Detection choose: RMS
In field Lines: I choose 400 Lines
In field Number of Average :I choose usually 4
In field Averages Type choose : Average
In field Average Mode choose :Cont.
In field Average Overlap choose : 50%
In field Window choose :Hanning
In field Synchronous RPM choose synch.rpm of your motor: 3000,1500,1000 or 750
In field Motor Nameplate data I usually shoose OFF
3. Then you must install and turn on Current clamp and in Current Analysis press Take Data.
4. When you save the results of MCSA in Review mode you can see results and Rotor bar condition


Happy New year and Good hunting, Guru !!

This message has been edited. Last edited by: Panta,

Thanks panta...Its working....

Gurusamy,

Thank YOU for the update and closure of the post.It is right thing.

Have nice day ,
Panta

"If you measure motor current from line current transformer".
I do not understand this statement.
I have never done the test before.Should the test be done for all three wires (3 phase).

Panta means your current measurement must be correctred for the multiplication (or attenuation) factor built in to your clip-on magnetic current probe (or the current transformer built onto the motor's circuit. This allows the tester to show the proper current through the motor, when you are actually measuring only the current generated by the probe.
If the motor is running as a balanced 3-phase machine, you need to measure only one phase. You need three phases when you suspect the armature is the problem, or if it is blowing one fuse and leaving the other two alone. But since a broken bar in the rotor will rotate past all three phases, measuring only one phase for this kind of test works OK.