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All loads will be controlled manually through ON/OFF Backup supply will be used only during emergency

Thanks Brian I will use shunt trip as well besides LOTO

from the technical point of view, what is better 1- using 1250 A change over switch OR Using separate isolator and circuit breaker for each source and depending on LOTO theory?

Hi lads, need advice here we are building low voltage distribution panel to supply loads such as compressors, dryers, etc the main supply will be from the utility and we use 1250A LOAD BREAK SWITCH, at the same time the same panel will be supplied from the emergency supply which will be the...

Hi Lads just to let you know , after several trails and many attempts were taken we changed the drive and adjusted parameters like old drive and motor is working well thanks for your support

NEW MOTOR WORKED WEEL FOR OVER YEAR WITHOUT ANY PROBLEMS TILL LAST WEEK CONTROL MODE IS SCALER CONTROL MODE OPEN LOOP CONTROL SYSTEM WITHOUT FEEDBACK OVER CURRENT APPEATS AFTER 3 OR 4 MINUTES FROM STSRTING SPEED WITH FREQUENCY OVER 30 HZ

I checked all parameters all were good increased acceleration and deceleration times performed ID RUN ... the drive only worked well to values under 35 HZ When I increased the value over 35 HZ ..over current fault appears also ..mechanical team checked belts ..all is t=well checked bearing...

it was working well, motor was changed over year

I have Electric Motor 30kw operates with ABB ACS 550 VSD .. I Face Repeated over current fault when i increased frequency to 40hz ..which equals 1150 RPM ..where rated speed of motor 1500 RPM THE MOTOR used to drive supplu air fan for AHU system ...when we operate the motor in low speed 900...