Author Topic: Plus+1 PWM output to Parker VPL Valve  (Read 6185 times)

Offline paul.knapp

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  • Plus+1 programmer and control electrical designer
    • Hydraulic Frac Control Automation & Data Van Management Suite
Plus+1 PWM output to Parker VPL Valve
« on: February 06, 2017, 07:30:35 PM »
I have prgrammed the Plus+1 to control a Parker VPL valve and verified that it is outputting a 0 to 100% duty cycle, 24V amplitude square wave, and 75Hz.  The Parker representative has verified that the valve is a 75Hz VPL valve.  It is mounted in a hydraulic fracturing equipment and the sernial number / part number are not visible.

The valve gives 0 to 100% output with approximately 14 to 27% duty cycle.  This does not compute with the VPL specs which say the valve should output 0 to 100% with a duty cycle from 25 to 85%.

We want the full range response of the valve over a larger duty cycle to get the desired control.

Does anybody have any experience or solution to this or seen a similar problem with the combination of Plus+1 and VPL?

Please email me -

Thank you for your help in advance.

Offline FluidPowerTom

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Re: Plus+1 PWM output to Parker VPL Valve
« Reply #1 on: February 07, 2017, 05:49:20 PM »
Paul, I sent you an email.
Controls Engineer
Hydra-Power Systems