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ManualsBrandsJohnson Controls ManualsDampersVA-7150 24V 3 Wire Incremental Electric Valve Actuator w/ Position Feedback (90 lb-in)

Product/Technical Bulletin VA-7150

Issue Date 0513

Part No. 14-986-7, Rev. E www.johnsoncontrols.com

Code No. LIT-977312

The VA-715x Series synchronous motor-driven

actuator provides incremental (three wire), incremental

with feedback, or proportional control of valves with up

to 3/4 in. stroke in heating, ventilating, and air

conditioning applications.

This compact, non-spring return actuator has a 90 lb

force minimum and responds to a variety of input

signals.

The VA-715x Series can be easily field mounted or

ordered factory coupled to VT Series terminal unit

valves, VG7000 Series valves, or VBC Series bronze

cage trim valves. In addition, this actuator can be field

mounted to 1/2 in. flare valves. Refer to the VT, VBC,

VG7000, and VTF Series bulletins for available

configurations.

Figure 1: VA-715x Electric Valve Actuator

Features and Benefits

90 lb Force Output in a

Compact Unit

Covers a wide range of applications with

one actuator

q Magnetic Clutch Provides constant output force for positive

closeoff of valves, and protects motor in stall

conditions

Durable Construction Provides a longer cycle life

Unique Yoke Design

Easy field mounting to valves reduces

installation and stroke adjustment time

q Selectable Direct/Reverse

Action

Eases setup and installation

VA-715x Electric Valve Actuator

Summary of content (9 pages)

PAGE 1
Product/Technical Bulletin VA-7150 Issue Date 0513 VA-715x Electric Valve Actuator The VA-715x Series synchronous motor-driven actuator provides incremental (three wire), incremental with feedback, or proportional control of valves with up to 3/4 in. stroke in heating, ventilating, and air conditioning applications. This compact, non-spring return actuator has a 90 lb force minimum and responds to a variety of input signals.
PAGE 2
O peration The VA-715x Series actuators use a reversible synchronous motor and a magnetic clutch to accurately position the valve. This combination can reliably generate 90 lb of force in either direction. The internal circuit activates the motor to rotate in the proper direction. The gear train and drive screw move the valve stem to the position called for by the input signal. The actuator maintains the shutoff force even if power to the actuator is removed.
PAGE 3
I 2. Unpack the actuator and remove its cover by removing the single screw in the top. nstallation 3. Manually turn the gearing between the metal plates to achieve Dimension “A” as shown in Figure 4. (Use Table 1 to set Dimension A.) Drive Screw 24 VAC Motor Gear Table 1: Dimension “A” Gap Reference Dimension "A" (See Table 1 for dimensions.) Coupler Valve Family Valve Size or Style Valve Stroke Dimension “A” VT Series Valves 1/2 in. 5/16 in. 5/32 in.
PAGE 4
6. Push valve stem in so it is in full down position. 7. Position the actuator on the valve bonnet, and use a 5/16 in. nut driver to tighten the set screw. Position Scale Coupler Position Indicator Valve Stem Figure 8: Installing the Position Scale Note: Figure 7: Installing the Actuator 8. Lift the stem to meet the coupler and then screw the coupler onto the stem until the valve reaches the end of stroke in the full up position. (Coupler should be turned a minimum of four revolutions.) ! 10.
PAGE 5
The position feedback potentiometer is connected to Terminals R, W, and S. Terminals R and S are a fixed 2000 ohm resistance. The potentiometer wiper is connected to Terminal W. Resistance change vs. actuator travel is shown in Figure 12.
PAGE 6
In Direct Acting (DA) mode, an increasing signal will cause the actuator drive screw to extend, pushing the valve stem down. A decreasing signal will cause the actuator drive screw to retract, pulling the valve stem up. In Reverse Acting (RA) mode, a decreasing signal will cause the actuator drive screw to extend, pushing the valve stem down. An increasing signal will cause the actuator drive screw to retract, pulling the valve stem up (see Figure 2). 8. Replace the cover and secure with the screw.
PAGE 7
4. Set the signal fail position jumper to select default position of fully up or fully down. If the signal is lost at the actuator (open connection), the actuator will default to the pre-designated position of full up or full down. 10. Slowly turn stroke potentiometer Counterclockwise (CCW) until LED goes off. 11. Adjust voltage to drive actuator to the full up position. Verify zero adjustment. 5.
PAGE 8
S pecifications Product VA-7150: VA-7153: VA-7152: Power Requirements 24 VAC (20 to 30 VAC), 50/60 Hz VA-7150: 2.7 VA nominal VA-7153: 2.7 VA nominal VA-7152: 4.7 VA nominal Input Signal Incremental: Proportional: 24 VAC, 50/60 Hz 0 to 10 VDC Input Signal Adjustments (Proportional) Input Signal: Action: Factory Setting: 0 to 10, 0 to 5, 5 to 10 VDC (jumper selectable) Drive up (DA) or drive down (RA) on signal increase (jumper selectable) Calibrated 1 to 9 ± 0.
PAGE 9
Shipping Weight 1.7 lb (0.77 kg) Agency Compliance United States: UL Listed, CCN XAPX, File E27734; to UL 60730-1A: 2003-08, Ed. 3.1, Automatic Electrical Controls for Household and Similar Use; and UL 60730-2-14: 2002-02, Ed. 1, Part 2 Particular Requirements for Electric Actuators Canada: UL Listed, CCN XAPX7, File E27734; to UL 60730-1:02-CAN/CSA: July 2002, 3rd Ed., Automatic Electrical Controls for Household and Similar Use; and CSA C22.2 No.