User Guide

ManualsBrandsJohnson Controls ManualsDampersProportional Electric Valve Actuator, 0 to 10 VDC

FANs 977, 125, 1628.3

Product/Technical Bulletin VA-7150

Issue Date 0297

Part No. 14-986-7, Rev. D

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

❑

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

❑

Selectable Direct/Reverse

Action

Eases setup and installation

VA-715x Electric Valve Actuator

Summary of content (8 pages)

PAGE 1
FANs 977, 125, 1628.3 Product/Technical Bulletin VA-7150 Issue Date 0297 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.) D rive S cre w 24 VAC M o to r Gear Table 1: Dimension “A” Gap Reference Dim en sio n "A" (S e e T a b le 1 fo r d im e n sio n s.) Coupler Valve Family Valve Size or Style Valve Stroke Dimension “A” VT Series Valves 1/2 in. 5/16 in. (8 mm) 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. P o sitio n S ca le C o u p le r P o sitio n In d ica to r V a lve S te m 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.
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: Three wire incremental Three wire incremental with position feedback Proportional, 0 to 10 VDC 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.