Good afternoon , A colleague and I have been asked to install a compressor with a 3.3kV 1MW motor as its prime mover. We have been chasing the manufacturer for the typical Starting characteristic. We have been assured that the compressor can only start in an unloaded condition. That would...
Good points all round, We should not be where we are the kit should have been speced correctly, But we are where we are. What we are trying to achieve is a reduction without the disruption of TX change outs etc. We adhere strictly to G5-4/1 and are penalised by our DNO if we transgress. We also...
We are looking at installing Active Filters to mitigate enhanced harmonic propagation due to the addition of non linear loads to our network. We are experiencing about 2.8% Voltage THD at the 11kV point of common coupling which can peak at around 7% when differnet switching configurations are...
As a final update on this problem we have now changed out the remaining 2 failed motors. The same fault has been found on inspection of the failed WEG motors. We retrofitted ABB motors and have had no further failures to date. So as a summary we have had a 75% failure rate on the 4 WEG pump...
Motor connected up in Delta as per nameplate first thing we checked. ABB machines also connected up in Delta now running a month. Had one of the failures independently inspected and found to have shorted turns on one phase also loose rotor bars. WEG contacted and a poor response recieved...
We have just fitted four lowara pumps that came with WEG motors (37kW 400V 2 pole) . These motors are controlled by ABB acs 800 active front end drives. Within a week we had lost Three of the four Motors, motors taking very large currents and tripping on overcurrent before they got anywhere near...
