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Budokan
04-04-2004, 08:50 AM
I noticed recently that the solenoid coil on these valves are marked for a 220-240VDC supply (For AKV Use Only), however the controller was switching a 220AC supply.

Is there an obvious explanation for this.

Mark
04-04-2004, 09:36 AM
Hi Budokan :)
Danfoss make the AKV coil in various voltages as you know.
The 220- 230v a/c coil is around 10w the d/c version is 20w.Usually there is a part number stamped on it which will enable you to identify as to whether it is the correct coil fitted.
If not it could possibly be a printing mistake as i have had in the past.
Kind regards mark :)

Andy
04-04-2004, 10:07 AM
Hi :) Danfoss AKV coils are 240vdc, nothing else will work. The controller monitors the suply to the coil and if the coil has went open circuit or down to earth the controller will bring up an error indicating such. The use of a DC coil is to aid in this function. Other EEV controllers use 204vac, but will not be able to tell when the coil is faulty.
Kind Regards Andy. :)

Budokan
04-04-2004, 10:15 AM
Andy, What type of controller are you talking about - Danfoss?

The application was some new display cases with RDM control. My initial thought was a factory mix up.

It's been a while since I have worked on Radford controls but I am sure they used a low dc voltage coil?

Budokan
04-04-2004, 10:17 AM
Mark, What would be good to establish is do different control manufacturers have different coil ouputs.

Andy
04-04-2004, 10:23 AM
Hi Budokan :)
different manufacturers use differing coil voltages, some 240vac some 240dc and as you sate some 24vdc. You just need to keep a copy of the relevant instruction manual to be sure which is right. :o
The original system is Danfoss with a 240vdc coil, this is the one they all copy, but I suspect it is patented and the use of a different coil is one way of deviating from the patent as filed by Danfoss.
Hope this helps.
Regards. Andy. :)

Peter_1
04-04-2004, 12:20 PM
I have here the AKV catalog in front of me:

Available standard by Danfoss 230 VDC (for EKC414A, EKC414C, AKC72A, AKC 114-6 and AKC25H5 controllers), 24 VAC (EKC315A, EKC347, AKC24P2, 24 W2 and 24 W3) 230 VAC (for other controllers and PLC)

So, 230 VDC and 24VAC is standard Danfoss.

You can control an AKV in fact with any coil because they're controlled via PWM, so how the inner spindle in the AKV is lifted up is not important

Radford PCB's are provided to control directly the AKV's without an original Danfoss controller. They can control also different brand of stepper motors.

Peter

Mark
05-04-2004, 04:51 PM
Hi Budokan :)


I noticed recently that the solenoid coil on these valves are marked for a 220-240VDC supply (For AKV Use Only), however the controller was switching a 220AC supply.

A D/C coil would not work on A/C unless used in conjunction with a voltage rectifier. ;)

Kind regards Mark :)

Mark
05-04-2004, 07:20 PM
Mark, What would be good to establish is do different control manufacturers have different coil ouputs.

Budokan, hi :) the cheapest and favourable voltage is 220-230v A/C .Not to say that all controllers use this ;) Its all down to individual requirements from customers and controller specifications :) .

Kind regards Mark