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Valve position indicator, Damper, Hydraulic damper, Electro-hydraulic actuator, Actuator
Text version of the page
1.2 CVA Electrical Power Consumption
CVA is designed to be very efficient with very low power consumption. The relatively low power consumption measured during modulation (Continuous 2 Hz, 2% Cycling Test) is due to the inertial energy in the motor being converted back to electrical energy and stored. This energy can then be used to accelerate the motor in the opposite direction. If the reserve powerpack option is fitted, charging of the super capacitors will take place on power up. The LED will flash during charging and operation is inhibited during charging. Charge periods will vary with size. For the CVL500 the charge time is 30 seconds to 1 minute.Power consumption data for the CVL500 is shown below. For full details of CVA range power consumption, refer to publication P130E.
A ctuator S tate P ower P ower F actor P ower P ower F acto r @ 110 VAC (W) @ 110 VA C @ 230 VAC (W) @ 230 VA C StationaryMoving - No Loa 4. 7 .5 6 5 . 3 . 33 d 12 . 8 . 63 14.7 .44 Movin g - 50% Loa d 2 6 . 2 . 66 2 9 . 3 . 55 M oving Fu ll Loa d* 32 .1 . 66 32 . 1 .5 6 Charging UPS (Peak Power) 58 . 2 . 69 55 . . 63 C ontinuous 2 Hz, 2% Cyc l ing Test - Fu ll Loa d* 17.1 . 53 17 . 5 .4 5* Full load equates to 90% of rated thrust.
1.3 Positioning Control Performance
The following control positioning performance is based on a 4-20 mA control system with CVA operating over its maximum stroke, rated speed and constant force with minimum deadband set and with a linear demand/valve characteristic. Resolution is defined as: minimum change in input signal required for guaranteed response .
4 -20 mA Control - Positionin g : % demand si g nal ran g e R esolution ≥ 0.1 % Li near i ty ≤ 0.5 %1.4 Position Feedback Performance
The following position feedback performance is based on CVA operating at maximum stroke with a linear characteristic set. Resolution is defined as: minimum change in position/thrust required for feedback signal change . Feedback calibration is automatic to the set limit positions.
4 -20 mA Feedback - % feedback signal range Reso l ut i o n ≥ 0.1 % L inearity ≤ 0.5 %Ultimate performance will be determined by the process, valve and control system.