VA-7700 Series Electric valve Actuator
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European Electronic Controls Catalogue Catalogue Section Product Bulletin _Issue Date VA-7700 Series Electric Valve Actuator The VA-77xx Series synchronous motor driven actuator, for valves in heating, ventilation and air conditioning applications, is available for floating (3-point) control or proportional control with 0-10 V position feedback signal. It provides a stroke capability of 8 mm to a maximum 20 mm. This compact, nonspring return actuator has a 500 N nominal force and responds to a variety of input signals. The actuator can be combined with VG7000, VG9000 and VGS8... valves in accordance with the maximum close-off pressure ratings specified (see pertinent valve product bulletins). They can be ordered as a separate unit or as a factory fitted valve / actuator combination. □ Self adjusting proportional actuators □ Column of 5 Light Emitting Diodes □ Optional models with mechanical manual override □ Manual contact micro switch on all models with manual override □ IP54 protection class □ Unique “C” shaped yoke design □ Positioner with selectable starting point and span, direct and reverse action modes □ Magnetic clutch Easy, quick and precise commissioning servicing Allows easy visualisation of actuator stroke position and of the actuator status Allows manual positioning independent of the power supply Signals actuator mode status (automatic or manual) to external supervisory system. Allows installation in a wide range of environments Allows lateral mounting of the actuator reducing the vertical space over the valve needed for installation. Enables sequence control Provides constant output force for close-off of valves, and protects motor in stall conditions Actuator pre-set position after a control signal failure (extended/retracted), is selectable in-situ

These actuators can be combined with the following valve ranges: • VG7000 Series Threaded Valves Female and male threaded valves VG7 □□□□ T all body types DN 15...50 These actuators can be combined with the following valve ranges: • VGS8... Series Male Threaded Valves Male threaded valves VGS8Q[] WIN 3-way DN 15... 40 2-Way DN 15... 50 • VG9000 Series Flanged Valves Flanged valves VG9 all body types DN 20...50 Ordering procedure The actuator can be ordered as a separate unit or a factory fitted valve-actuator combination. Should the latter be requested, please just add “+M” to the end...

Operation Floating models * "Signal failure" position pre-set does not operate when 0.20 mA control is selected. The action mode, DA (direct acting) and RA (reverse acting) is set through the .DIP switches (see paragraph "DIP switch settings"). The actuator control signal has a buffer zone, at each end of the span, of 0.3 V or 0.3 mA. This ensures definite valve close-off. EMBED EMBED Control signal failure pre-set position (not functional with 0...20 mA control selected) A control-signal failure on proportional models will cause the actuator to automatically move the stem to a (via...

Auto-calibration procedure for freely defined control signal ranges Non standard control signals for example 2...8 VDC are applied by setting the DIP switches 3 and 4 (see paragraph "DIP switch settings"). It is recommended to set the actuator to the desired control-signal type and action before fitting to valve (see paragraph "DIP switch settings"). Power must be connected before the auto-calibration cycle can be started. It is recommended that the signal span is always set superior or equal to 3V or 6 mA in order to keep acceptable proportional characteristics. Procedure: (Actuator is...

DIP switches settings (Proportional models only) The DIP switches are accessed by removing the transparent cover. DIP switch definition Left hand position Right hand position 1, 2: Control signal type Control signal ranges Default setting from factory: All switches in left hand position. 1. Voltage control 2. 3. 0...10 VDC 4. 5. ---6. Direct Acting mode 7. Electrical manual override “off" 8. “Signal failure position” pre-set = “Up” 7: Electrical Manual override 8: Controlsignal failure position preset* * Does not operate with mA control.

Standard operating mode The LED display indicates the actuator stem position. The LED stops flashing when the position corresponding to the control signal has been reached. Actuator stem moving Actuator stopped between 40 to 60% of between 40 to 60% of stroke stroke Actuator status indication (Proportional models only) The actuator microprocessor carries out a failure diagnosis when a failure has been detected. The actuator status is indicated by the LED display When the micro processor detects that the stem has come to an unexpected stop it initiates a retry cycle, this is repeated...

Applications: Parallel and sequential operation Actuators without built-in positioner for controllers with PAT (Positioning Adjusting Time) output in parallel operation Although synchronous motors have the same running speed (rate of travel), deviation in travel between motors can accumulate during starts and stops because of varying loads. This deviation depends on the number of on/off cycles. By periodical switching of the actuators to end of travel, actuators running in parallel can be reasonably synchronous. 24Vac Com Actuators with built-in positioner for controllers with 0…10V output...

When mounting the actuator on a valve, please follow the instructions below: • It is recommended that the valves be mounted upright or at angles not greater than 90° in an easily accessible location. • The actuator must be protected against dripping water, which could enter the housing and damage the mechanism or motor. • Do not cover with insulating material. • Sufficient clearance must be allowed for actuator removal (refer to the dimension drawings). • All wiring must be in accordance with local regulations and national electrical codes and should be carried out by authorised...