PVEM wiring

[Earthmover]

Hi - this is not necessarily a PLUS+1 question per se but I need some help with controlling a 12V PVEM as a newbie.

We have 12v type 157B4116 PVEM's with Hirschmans which we wish to use as bi-directional proportional control on a motor.  We are using ethernet controlled digital to analogue outputs rather than Plus+1 stuff as we have a very particular requirement. 

Electrically we have 12 V (U+) on Pin 1, an Earth and the control/proportional signal on Pin 2.  This would map to Prop2/US2 on a Sauer controller.  The set up is the same as the minimum safety electrical diagram you see in the PVG pdf documents.

My expectation that was that a control signal of 6v would put the valve in a closed neutral position.  A signal of 3 to <6v would run fluid one way and >6v to 9V the other way.  The problem is that only the >6v to 9v signal works and sends fluid one way only.  Nothing happens with a <6V signal.  The wiring diagrams are not that clear (to me).

Can anyone tell me what I've missed or offer a troubleshooter?  The diagrams do show a separate signal line onto Pin1 coming from N_SW-Out.  What does this do and should we be using it?

thanks - I'm desperate as we're supposed to have a system test Monday!

[CShultz]

Hello,
This may be a little delayed, however I believe you need to use three pins on the PVEM Hirschmann Coils.
1 for Supply Voltagee
1 for Control Voltage
1 for earth ground

Did you have proportional control of the one direction that is properly worked?
I will try and help any way I can.
I am a newbie too.. so I know the feeling.

Cheers!

[bgtwuk]

Are you sure the valve is not expecting 24 volts?

[Marbek_Elektronik]

Hi,

1. 157B4116 is PVEM, 12V (11..15V)
2. Be care to use PWM Output. PVEM needs analog signals.
We have adapters 0..10V or 4..20mA to Sauer - dAnfoss 25..75% (10..30V)
I think this is not your problem, but please only use analog signals.
Please measure the signals.

3. Maybe the problem is a hydraulic problem, pilot oil.....?

For new pojects I would use PVEA.

Best regards,
Bernd