VA-7482-8002-RA Johnson Controls Actuator

Datasheet

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Auto Stroke Detection Models for Proportional Control Mode (VA-7482-8002-RA and VA-7482-9002-RA Models)

The auto stroke detection series is suitable with valves having a minimum of 20 N spring preloading. When the power is applied, the actuator self-calibrates performing a complete cycle to detect the real valve stroke. The actuator moves the stem down for a complete mechanical valve stroke until no stroke changes are detected.

Once the lower valve stem position is detected, the actuator moves the spindle of the actuator up until the spindle is fully retracted in the actuator. The microprocessor counts and stores the full stroke of the actuator. The actuator then drives the spindle down in order to detect the upper valve stem position and to calculate the real stroke, minus the gap value. As soon as the spindle of the actuator touches the valve stem, the actuator exits the self-calibration mode (the LED turns red and blinks) and enters the operational mode (the LED turns green).

When the input signal increases (for example, from 0 V to 10 V), the actuator is configured as Direct Action (DA). The actuator retracts if the actuator is configured as Reverse Action (RA).

When the input signal decreases (for example, from 10 V to 0 V), the actuator stem retracts if the actuator is configured as Direct Action (DA). The actuator extends if the actuator is configured as Reverse Action (RA).

VA-7482-8002-RA and VA-7482-9002-RA Models

When the input signal remains at 100% for one hour, the actuator turns on the motor and drives the spindle for approximately 60 seconds to confirm the end of the stroke.

Features

• 24 VAC/DC and 230 VAC power supply
• Floating and Proportional control
• Threaded nut M28x1.5 and M30x1.5
• Auto stroke detection
• Configurable stroke
• Configurable to direct and reverse action
• Configurable analog inputs
• Feedback Control
• Fail-Safe
• IP54 Enclosure protection for 24 V models and IP43 for 230 V models