Driving PVE-valve over a long distance (300m)

[Marbek_Elektronik]

Hello,

have anyone some experience about this?

A customer wants to connect a PVE-valve (PVEA?) over 300m to an analog joystick!

Maybe, there are some problems:
1. 300m cable (1,5qmm) -> 2x3,5 Ohm resistance.
2. What's about the disturbance?

Have you tested such cases?

What do you suggest to do?

It will be installed in russia.
So I don't know, if it is an good idea to use can bus.
It  have to be an simple solution.

Thanks for helping.

[Neil]

Hi Marbek_Elektronik.

I looked at a PVEA application over 80m and like you, I was conscious of the potential risk of voltage drop and disturbance etc.
After much thought and deliberating I decided to use a output expansion module at the valve, with a small MC12 to profile my input device.



Regards Neil

[Marbek_Elektronik]

Yes, that was my thought too.
But the customer needs 300m and he wants to roll up the cable every day.
So the cable become very expensive.

I think, a joystick with 4..20mA output and a adapter from 4..20mA to PVG-Signal is good.
(We have such adapters)
Because you only need 2 wires.

But perhaps somebody have done this with normal 3-wire cabel over 300m and it works well?

Best regards,
Bernd

[Gregor]

Hi there,
you should use a PVE with active fault monitoring, because some of those adapers, especially the 4-20mA types where not that satisfying as they should.
If you have a wire break on the signals leads, your PVE will start moving uncontrolled.
I had problems with these adapters with an PLC. If a have to use adapers i try to use the +/- 10 Volts Signal.
But these will have the same problems with the distance.
I would prefer a solotion with a CAN-BUS, too...

Regards
 Gregor