Recent content by ws0619

Hi all, I would like to install Capacitor Bank into my control panel board which contains of few 10HP induction motors. Currently I'm just able to measure the Ampere for every induction motor by using current meter. How to calculate the reactive power for 10HP 3phase 4pole induction motor by...

Hi, I want to connect my PLC at the control panel board to my office PC. There are two ways available for me to connect it. One is by using RS485 and one is by ethernet cable. The main concern is the cable has to travel for a far distance, about 7.8meter and the environment is full of...

Attached with the bearing fail photos.It is actually fail on the load side bearing, but the bearing that located near to cooling fan of induction motor, it is in good condition. Hope you all can enlighten me on how to cure bearing failing problem. Thanks!

I have sent most of the motors for rewinding, asking the technician to take the photos on the broken bearing part. I plan to reduce the environment temperature,maybe is because of high environment temperature, causing motors easily to trip. Fixed speed induction motor, direct connect the motor...

Hi, Is it possible to install two main drives in one chain conveyor to boost up the chain conveyor speed? If possible how to synchronize between the two main drive motors. The motors will control by inverter. Thanks!

thanks for your idea.Now i am looking on the lubricant melting temperature. Most of the motors have bearing problem initially then develop into winding short-circuited problem.

Hi, To rise the oven temperature, I try to increase my oven blower motor HP from 7.5HP to 10HP then to 15HP. The result is I have achieved my objective, the oven temperature rise when I increase the motor HP.However, those induction motors cannot run more than half year. The major problem is...

2 incoming blowers (bring air from outside into the room) total up are 3200CFM, and the exhaust fan is 3500CFM. Base on the calculation you provided to me, I'm not sure how much KW heat dissipated from the transformer, and I can't contact back the manufacturer.So, I will plan to install another...

very hot inside the room (those heat dissipated from the transformer itself), even wall fans have installed the room still in hot condition. Two blower fans installed(top right side of the room) at the wall to blow out the hot air and one air blower installed near the door (bottom left side of...

Yes,is a oil-filled transformer,there is a temperature indicator for the oil provided by manufacturer. The standard temperature given by manufacturer is around 50-60degreeC,and currently the temperature rose to 65degreeC. For the temporary solution, i have to cool down the temperature of the...

Neither can i install a new transformer or change to a higher kVA one, it's restricted by the space available. I need to reduce the temperature 1st while thinking a way to reduce the load's current consumption. Thanks a lot guys!

Hi, I have one 2500KVA transformer with 11kV/433V. The maximum current at low voltage side for this transformer provided by producer is up to 3333.49A. Currently, this transformer is running with 2700A which is about 80% of transformer usage and the temperature of the transformer has reached to...

Hi! May I know what type of this source code it is?It looks like assembly code, but I'm not sure. LIST p=16f648a include "P16f648a.inc" __config h'3f18' PC equ h'02' cblock h'20' endc org h'0000'...

Because I need a switching function of transistor, and what I learned just on theory about transistor.I don't know what transistor to use, so I just google for the switching transistor and I get this type of transistor. Is it not suitable to use 2N2222?

Hi! I saw this words "transition frequency" in the 2N2222A transistor data sheet.f=100MHz. What's this actually? I want to use this transistor 2N2222A to act as a switching application for turning on the motor by using microcontroller. So what should I consider when using this transistor...