Hi everyone
We have a 0.55KW gear motor in our factory that because of process reasons needs to work at a much lower than its rated speed constantly. The rated electric motor speed is 4Poles/1500RPM and the installed VFD needs to set the frequency to about 20Hz constantly. This motor’s winding...
@RRaghunath
Thanks for the reply
I started this motor yesterday, only to check the starting current. Because this motor is connected to a fan and motor is designed oversized (330KW, 560A on nameplate) it has a large starting current (560*4=2220A) but after reaching its rated speed, it only...
@LittleInch
Thank you for the reply
This DG is going to be used only 10-12 times a year and each time about 2-3 hours. Is it still going to be a problem?
Because motor is connected to a soft starter, it is not a massive spike, it starts with low current then slowly increases to 2220A and then...
Hi everybody. I want to size a stand-by diesel generator for a plant and I need a bit of help here
The final steady-state load is 750KVA, 630KW, 1100A. Derating Factor in the location is 12%.
My main concern is that this diesel generator should be able to start an electric motor that has a heavy...
@RRaghunath
Thanks for the response. This happens to some of our motors and their modules that are designed poorly and require more maintenance. Also some of the conveyors need regular maintenance and for that we need to isolate power supply to the motor frequently.
Rack-in & rack-out is done by...
Hello everyone.
We have several 400V MCCs in our factory with withdrawable unit cubicles (SIVACON 8PT). The current practice for disconnecting power supply to electric motors in our factory is that we switch off the MCCB and we also withdraw the power unit completely. Because of the high number...
@RRaghunath
Thanks for the reply. Yes, at 400V we have a generator connected to the bus in case of power outage or transformer failures.
in fact, there are two voltage monitoring relays at 400V level, one with (27, 47 & 59) functions sensing busbar voltage which kills the control circuit voltage...
Hi everyone,
In our factory, we have five 400V MCC panels which there is an undervoltage relay in the incoming of each panel. I want to reset the settings of these relays which are a bit too sensitive and incoherent with each other (some are 0.8Vn, 100ms and some are 0.75Vn, 4s)
1) Is there any...
