Description
A compact plug-in style, microprocessor based valve driver designed for use on hydraulic proportional valves for fan drive applications. Configurable to drive two coils using SAE J1939 CAN input or an independent signal. TheEFDR-0201A proportionally controls one coil to a user-defined metering profile and provides reverse sequence control with the second coil providing fan direction. The profile provides either a straight-line or multi-sloped output that you configure withHF-Impulse software: an easy to use, configuration tool available as a free download atwww.hydraforce.com/electronics. Two output LEDs are located on the front.
Operation
The controller accepts inputs from commonly available sensors or SAE J1939 CAN input. The input signal drives the output current to the user-defined ramp rate, enabling accurate control of fan speed. Reverse sequence control is provided as well. The reverse sequence changes the direction of the fan to clear debris. A variety of methods can trigger the sequence (switch input, temperature sensor, J1939 message or periodic.) The timing sequence can control the fan speed as well as the fan direction to avoid abrupt reversals. Built-in diagnostics detect fault conditions that automatically deactivate the outputs. The controller has two LED output indicators.
Diagnostic Features
- Any supply voltage below 8.5 Vdc causes the controller to default to the valve-off mode.
- The driver output drops and holds at the inactive stand-by condition. Any short or open circuit condition is automatically detected as an error.
- When the fault is corrected, the controller returns to standard operation.
Multiple Personalities
The EVDR controller is available in multiple configurations (personalities) to suit the needs of specialized applications. Choose the one that best fits your needs.
EVDR-0201A - General Purpose.
EDFR-0201A - Fan Control.
ECDR-0201A - Configurable.
