Successful voltage protection relay for High-Risk Applications
Reliable voltage protection relay Styles for Industrial and Industrial Applications
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At work we have an exhaust extraction fan that has a 15 HP motor. It is showing a draw on two legs at start up of over 200 Amps leveling to 35 amps once at speed. The third leg has only a 150 Amp draw leveling to around 30 amps. Is this normal? It is causing the thermal protection device to trip off. Once it gets to speed it is fine, I think, but by then the thermal device is tripped off. Any suggestions as to the first check? This system has been in place for 10 years with no problems (or maintenance). The motor seems fine when it is running. The fan must be heavy because it takes a long time to stop once it has had power removed. It is up on a roof with limited access, I will be looking at it tomorrow. I didn't expect it here but only an hour old and already three fantastic answers! I'm going to leave it open and see how many more great answers there are out there! Thanks guys. I'm glad I took a breath and stepped back today and didn't start buying the wrong parts to throw at it. $$$$$$
And got the following answer:
USA NEMA standard motors have a code letter on the nameplate to indicate starting current, not a precise value. However 200 amps is in the range to be expected. The unbalance among the phases seems a little higher than expected. Check to see what the voltage is and how well balanced it is. Check the connections at the overload relay, starter, disconnect etc. Is this a new installation or an old installation that formerly worked properly? PS1 If the fan takes a long time to coast to a stop, it is probably a bit if a strenuous job for the motor to start it. It might not take a big change in the system to get to the point where the overload relay trips during starting. It could be bearings wearing out or dirt building up. It could be something like an increase in overall system load that reduced the supply voltage a little. It could be an increase in single phase loads that caused some unbalance in the three phase voltage. It could be a couple of shorted turns in one phase of the motor due to years of hard starting.
The voltage protection relay operate particularly properly with different applications which are particular to energy distribution and protection. The relays come with wide adjustment ranges with a scale that may be simple to read either in 3 or 4 digits in line with the model. These voltage protection relay assistance in escalating the flexibility of your applications, decrease the overall power and maintenance expenses. You will discover relays which are utilized for basic purposes which are available in trusted styles with fast replacement choices. And you will find models which can be used for industrial applications and heavier duty applications that work on substantial loads. These goods are produced to meet the lifetime industrial control desires from the applications.
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