Noted. And we have already communicated this to customer, but thank you for the confirmation.
They are, in my opinion, actually slightly better than doing it with contactors in that there is no torque surge when banged on with a contactor, so the valve lasts longer and there are no contacts to burn out and / or weld.Hello again,
jraef, thank you, I think that answers the question for me. It is possible, but you shouldn't. It won't be any better than using contactors.
g, they are not too big, 400VAC/0.1kW.
from my own experience, if its "not fit for purpose" then you will waste time and money doing a compromise and it will forever haunt you and eventually you will change it out.
just do it right first time around.
i use this saying "i have time to do it right, but don't have time to do it again"
Hi guys,
Yes I know the AUMA supplied positioners, they are great. My customer "forgot" to order them with the valves. So all we have is a valve, with a 3 phase motor, position feed back, and limit switches.
They do not seem to understand the issue, we have told them to return the units to AUMA and let them add whatever they need to make it suitable for our system.
So I am just brain storming possible solutions here, my idea for using a VSD is to be able to slowly jog the valve motor, in either direction, using the pot meter as feedback.
We have done this with contactor based motor reversing, but it has shown to be pretty hard on the system.
So, again, the thought just crossed my mind and I was wondering if any of you has done it this way before.
Thanks again!!!!