Hi Engineers,
I am looking for guidance on selection of Low Voltage Drives on the basis of:
1.Dimensioning- torque,overloadability
2.Performance- V/f control, sensorless vector control,closed loopp vector control,static & dynamic accuracy of speed & torque, respose time
Searching threads...
Motor size classification is getting confusing. Some vendors are following Size classification other than the NEMA standard.
Could you please help me with any information regarding correlation beetween the different size classifications?
Hi,
This question is baffling me ever since I am working in this crane.
This crane lifts containers of max. load 40T. It uses rectifier-drive for control of all motors. The kVA rating of the diesel generator set is 670kVA. CAlculating the max kVA load including all auxillary drives, it comes to...
Hi,
With 2 of our alternators down with IR value of 1M? it is a precarious condition for us. Any one of the working alternators gets broken down then it would be disastor.
The heating with sodium vapour lamps and heat radiators is proving to be very slow.
I need your help with the...
Hi,
I am new to alternators and AVR cards. I would like to know the reasons(and consequences) of isolating the AVR card before meggering the alternator.
Hi All,
Please, suggest for troubleshooting circuits having different types of sensors e.g. fluid level, proximity, limit switch etc.;output going to relay which sends 24V input to PLC.
Also how to troubleshoot the 2 point or 3 point sensors with power ON or OFF.
Thanks,
D'man
dear pals,
i am curious about nitrogen injection in a transformer under vacuum. it is generally being done in the oil cooled transformers, after draining the oil.
the transformer is subjected to impedance heating under vacuum. then impedance heating is stopped and nitrogen is injected. after...
hi all guys,
whenever we are testing a variac at no load, a specific turn of the coil is getting heated very quickly. this is happening with the specific turn on which the carbon brush is placed. also this does not happen with the whole winding, only at one or two turns.
first we thought that...
