Hi All,
Given the impressive amount of knowledge gathered in my first topic, I really wsnted to open a new one.
The broad question is:
What's the differenxe between Circuit Breaker, Motor Starter and Thermal Overload Relay when protecting a motor?
I can see that at first glimspse they seem...
Thank you all, great allure of information. I will put everything together and do this magic.
My only concern about this project is spotting the blind corners. A small mistake and I will send to hell both AHU and Control Panel.
Hi Che Kuan Yau
A1. Please tell us a little more the reasons WHY/WHAT are you after; stating that "...the operator is acting on a selector switch with SD/OFF/VSD positions " If you are a technical school or a test lab to illustrate/study the difference between SD and VSD, then we can...
Hi Bill
Google zero speed switches.
These often are used on conveyors and belt drive applications to detect belt slip and blockages and jam ups.
This is your best proof that the motor has stopped before being re-started.
I will. That sounds good.
I would consider a check circuit as well. When...
Hi Lionel
Instead of a timer, I tend to wire controls so the selection is locked until the motor is stopped. So when the selector is in VFD mode, switching the selector does nothing until the VFD and motor are stopped.
Very happy not to use the timer. How can I implement that? Not sure how to...
Thanks Keith. Well, now I see why there is a request for a digital timer in the bill of materials. I suppose the client wants to make sure (as you pointed) that no harmful switching is applied when the motor is still running).
By the look of it, it seems there is no automated equipment that does...
Hi All,
I'm new into this forum so apologies if this topic was already discussed in the past.
I'm supposed to draw a control panel which would include both VSD and Star/Delta motor starter. Baaically, the operator is acting on a selector switch with SD/OFF/VSD positions. Do you happen to have a...
