CVPV Module

CVPV is a CanOpen protocol CanBus module, to be mounted on a standard DIN rail, for direct driving of hydraulic valves with solenoid current control.

The space required for installation is minimized by the vertical design of the module.

The module can drive 1 or 2 solenoids, depending on the type of valve: pressure or flow rate. Two different modules are available depending on the feedback signal source being internal or external. In both cases the reference signal is provided via CanBus.

In case of internal feedback the reference signal is a current signal, and the feedback loop closes on the output current measured inside the module.

In case of external loop the reference signal is of varying typology, and it must have the same physical dimensions of the feedback signal, measured on the second analog input. The feedback loop typology can be:

• pressure loop with external pressure transducer;

• flow rate loop if an external flow rate transducer is available;

• position loop of an hydraulic cylinder using an external analogic position transducer mounted on a stand.

Calibration, and parameterization are performed via CanBus. It is possible to calibrate loop parameters, and the following additional settings are available:

• 5 point input characteristic linearization with deadband, and threshold handling.

• Ramp to set the time to bring the reference from 0 to maximum.

• Dither to be overlayed to the output current signal and whose frequency, and amplitude can be set.

Analog inputs can be connected from differential voltage inputs with dynamics 0/10 V or +10/-10 V, current signals with dynamics 4/20 mA or 0/20 mA, and potentiometric tranducers powered by the module.

4 groups of spring-cage connectors are provided:

• One 4 points group, of which only 2 are used for 24 V power supply, and the other 2 are unused. The source this power supply is taken from is the same source the power supply for both for the module, and the solenoids, is taken;

• Two 4 points group with the following purpose:

  • Potentiometer power supply positive pole;

  • Differential voltage signal input negative pole / Current input negative pole;

  • Differential voltage signal input positive pole / Current input positive pole / Potentiometric cursor;

  • Potentiometer power supply negative pole;

• One 4 points connector, two for the positive solenoid, and two for the negative solenoid;

• One 8 points group for the CanBus line, connected in pairs with the following scheme:

• • left (+24V_CAN)

  • middle left (GND_CAN)

  • middle right (CANH)

  • right (CANL)