Electronic and Electro-Hydraulic Controls

EACD-1 — AC Frequency Detector
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EVDR9 Controller

CV08-20 Valve symbol


Optical isolation provides protection of DC electronics from the AC power source..
Tested for severe environmental conditions - temperature, vibration, and voltage transients.
Low cost way to monitor AC power frequency

The EACD-1 is an optically isolated AC frequency detector intended for use as a feedback with HydraForce electronic controllers used in hydraulic motor-driven AC power generator applications. The output of the EACD-1 provides a frequency pulse signal based on the generator speed to directly drive the frequency input pin of the controller operating in closed loop mode.


The AC output voltage from the power generator provides the input signal and is connected to pins 1 and 2. Pin 3 connects to the electronic controller signal ground. Pin 4 connects to the electronic controller signal input. The input type of the electronic controller is set to frequency pull-up. A portion of each positive half of the AC input will cause the output pins 3 and 4 to conduct and produce a logic low pulse.

Note: You may connect pin 4 to positive voltage and take the output signal at pin 3 to provide a logic high pulse each cycle. If using this mode, take extra care not to exceed the voltage and current limits of the device.

Note: We recommend use of a fuse on the AC inputs.


Input Voltage Range: 90 to 250 ac RMS
Input Frequency Range: 0 to 130 Hz
Input Resistor: 16k
Output Voltage: 40 dc maximum
Output Current: 2.5 mA maximum
Electrical Isolation: 1500 Vrms minimum
Operating Temperature: -40 C to 85° C (-40 to 185°F)
Ingress Protection Rating: IP67
Electrical Connector: Deutsch DT04-4P
  (mates with DT06-4S)


EVDR9 Dimensions


Connector J1 Pin Description
Pin 1 AC Input
Pin 2 AC Input
Pin 3 Output Signal −
Pin 4 Output Signal +


EACD-1 - Part No. 4002782
Mating Connector - Part No. 4001953
Compatible Electronic Controller: EGDR-0101A (Part No. 4204850)

ExDR-Type Controllers Selection Guide PDF file of this page
Valve Coils and Electronic Controllers – Contents Request a quote
Electronic Vehicle Controls – Intro. & Contents