Johnson Controls VA-9070 Series Manuale utente

Technical Bulletin

Issue Date March 14, 2005

VA-9070 Series Electric Rotary Actuators

Introduction Page 2

Internal and External Components 2

Electrical Operation 2

Mechanical Operation 2

Manual Override Operation 3

Pre-installation Storage 3

Installation 4

Mounting 4

Wiring 5

Setup and Adjustment 8

Accessories 11

Troubleshooting Procedures 14

Disassembly and Assembly 19

General Information 19

Appendix A 29

VA-9071 and VA-9072 Actuators 29

VA-9073, VA-9074, VA-9075, VA-9076, VA-9077, and VA-9078 Actuators 31

Appendix B 33

Code No. LIT-977325 www.johnsoncontrols.com

Introduction

Internal and

External

Components

The VA-9070 Series (Bray® Series 70) are quarter-turn, electric

rotary actuators with manual override, designed for use on most

Johnson Controls® VF Series Butterfly Valves sized for up to 6,500 lb·in

(734.5 N·m) of torque. VA-9070 Series electric actuators cannot be used

on the VF4000 and VF5000 Series Butterfly Valves with the

M9000 Series Actuators. Operating speeds vary between 6 and

60 seconds.

The VA-9070 Series actuator is divided into two internal sections: the

power center below the switch plate and the control center above the

switch plate. The power center (below the switch plate) contains the

capacitor and gear motor (with its spur gear train). The power center

drives a final non-backdriveable worm gear output. The power center also

houses an override mechanism for manual operation. The control center

(above the switch plate) has user-accessible components: the camshaft

assembly, limit switches, terminal strips, torque switches, heater, and

servo.

On the outside of the actuator housing are adjustable mechanical travel

stops, a large position indicator, the manual override hand wheel, and dual

conduit entry ports. The external coating is a polyester powder coat,

providing resistance to Ultraviolet (UV) radiation exposure and chemical

exposure.

The motor in the VA-9070 Series actuator is a permanent induction split

capacitor design (single phase AC power). Travel limit switches are

mechanical Form C Single-Pole, Double-Throw (SPDT) switches with

two independent circuits. These SPDT switches are rated at 10 amperes

(75 to 80% power factor), 1/2 hp 125 VAC, and 3/4 hp 250 VAC.

Electrical

Operation

If the torque capacity of the actuator is exceeded to the point where the

motor stalls and overheats, a thermal protector switch built into the motor

windings automatically disconnects the motor power. Once the motor

cools sufficiently, the thermal switch resets.

Mechanically the ratio of the gear motor determines the speed of the

actuator. The gear motor uses high-efficiency spur gears with different

ratios for the different speeds. Initial gear reduction through the spur gears

transfers to the worm shaft. The final gear reduction and output happens

through a non-backdriveable worm gear set. An indicator-camshaft linked

to the output shaft determines positioning. The manual override drives the

worm shaft when engaged.

Mechanical

Operation

2VA-9070 Series Electric Rotary Actuators Technical Bulletin

The manual override operates similarly to the adjusting knob on a

mechanical wristwatch. To engage the manual override, pull the hand

wheel to its outermost position. When the manual override engages, the

actuator stops electrical operation.

Manual

Override

Operation

A yellow position indicator provides visual indication that the manual

override is engaged. Dry contacts on an internal switch can provide remote

electrical indication of the override status.

Pre-installation

Storage

Spring plungers hold in place the two hand wheel positions (engaged and

disengaged). The hand wheel remains in position until physically moved.

Rotating the hand wheel in a clockwise direction rotates the output shaft in

the same clockwise (closed) direction. Rotating the hand wheel in a

counter-clockwise direction rotates the output shaft in the same

counter-clockwise (open) direction.

A temporary conduit entry plug, installed in shipped actuators, prevents

foreign matter from entering the actuator. Store the actuator properly in a

dry, temperature-controlled area to prevent moisture from entering

through this temporary plug. Replace the temporary conduit plug with a

permanent conduit plug if the actuator is stored for a long period of time

or stored in adverse conditions. Prevent condensation from forming by

maintaining a near constant external temperature and supplying power to

the heater internal to the actuator.

VA-9070 Series Electric Rotary Actuators Technical Bulletin 3

Installation

VA-9070 Series electric actuators are suitable for direct mounting on most

Johnson Controls VF Series Butterfly Valves. VA-9070 Series Electric

Actuators cannot be used on the VF4000 and VF5000 Series Butterfly

Valves with the M9000 Series Actuators. Installing the VA-9070 Series

actuator onto other quarter-turn valves or devices requires proper

mounting hardware.

Mounting

When mounting the actuator in the standard position, orient the actuator

with its handwheel in a vertical plane and parallel to the pipeline. When

mounting the actuator on a vertical pipe, position the actuator with the

conduit entries on the bottom to prevent condensation from entering the

actuator by way of the conduit. In all cases, position the conduit to prevent

drainage into the actuator.

Mount the actuator to the valve using the following procedure:

1. Manually operate the actuator until the output shaft of the actuator

lines up with the valve stem. If possible, use an intermediate position

(such as valve disc/stem and actuator half-open).

2. Place the proper sleeve adaptor (if required) onto the valve stem.

Apply a small amount of grease to the sleeve adaptor to ease assembly.

3. Install the furnished mounting studs by threading them all the way into

the actuator base. (Insert the short, threaded length into the actuator.)

4. Mount the actuator onto the valve stem. Be sure the mounting studs

are properly aligned with the holes in the top plate of the valve or the

mounting bracket. If necessary, manually override the actuator to align

the mounting studs with the mounting holes.

5. Lower the actuator onto the valve and secure it tightly in place with

the furnished hex nuts and lock washers.

4VA-9070 Series Electric Rotary Actuators Technical Bulletin

Wiring Connect the actuator to field wiring:

1. Remove the metal conduit plug for the power connection. Each

actuator has two conduit entries (one for power and one for control).

2. Terminate all field wiring at the actuator terminal strip in accordance

with the wiring diagrams attached to the inside of the actuator cover.

Note: The terminal strip accepts wire sizes ranging from

10 to 22 AWG (12 to 22 AWG for the servo). Do not use wire smaller

than 18 AWG.

Note: The motor full load current is noted on the nameplate of the

actuator.

Note: The heaters use approximately 0.5 amperes at 110 volts.

3. Properly seal the conduit connections to maintain the weatherproofed

integrity of the actuator enclosure.

Note: The square-head conduit plug is weatherproofed but may

eventually degrade. If the square-head conduit plug degrades, replace

it with a metal plug.

RED

BLUE

CLOSE N.O.

(VOLTAGE FREE)

OPEN N.O.

(VOLTAGE FREE)

COM

N.O.

N.C.

AUX OPEN

OPEN

GREEN

CAM

RED

CAM

COM

AUX CLOSE

OVERRIDE SW

COM

YELLOW

BLUE

RED

YELLOW

HEATER (OPTIONAL)

Ground Ground

Open

For Heater

Only

Open

Neutral

Live Blue

Red

Yellow or

Black

Motor

N.C. = Normally Closed

N.O. = Normally Open

Wiring_heaterandaux

Figure 1: Typical Wiring Diagram of VA-9070 Series Two-Position

Electric Rotary Actuator (Shown with Heater and Auxiliary Switches)

VA-9070 Series Electric Rotary Actuators Technical Bulletin 5

Red

Cam

Green

Cam

Red

Blue

N.O.

Com

Close N.O.

(Voltage Free)

Open N.O.

(Voltage Free)

Calibrate Status

Input (-)

Input (+)

+5 VOLTS

Return

Retransmit

Motor Close

Motor Open

Neutral

Line Neutral

Line Power

Com

Common

CB OPEN

CB CLOSE

Common

Handwheel

Common

OP Torque

CL Torque

Common

Close Limit

Open Limit

24Ground

TxD

RxD

-VCC Serial

Interface

Input Control Signal Selection

For 4 to 20 mA- No Jumpers

For 0 to 10 VDC - Jumper

Common

to CB Open

For 2 to 10 VDC - Jumper

Common to

CB CLOSE

HTR

+5 VDC at 50 mA

(If Required)

Neutral

120 VAC

Ground

Load device

not to exceed

1K Ohms

Outgoing

Feedback

Signal

Actuator shown in the Closed Position

Manual Override not engaged

Single

Phase

Supply

Heater

Incoming

Command

Signal

Wiring_modulating

Figure 2: Typical Wiring Diagram of VA-9070 Series Modulating

Electric Rotary Actuator (Shown with Heater)

6VA-9070 Series Electric Rotary Actuators Technical Bulletin

Use a multiple pole switch to connect two VA-9070 Series electric

actuators. See the Correct Wiring schematic in Figure 3.

Multiple Actuator

(Parallel) Wiring

Do not connect more than one actuator to a Single-Pole, Double-Throw

(SPDT) switch. In the actuator, voltage is present on the non-powered

motor winding (opposite to the powered motor winding). Connecting the

voltage-containing, non-powered motor winding to another

voltage-containing, non-powered motor winding interferes with the motor

performance. See the Incorrect Wiring schematic in Figure 3.

Neutral Live

Open

Motor Motor

DPDT

Switch

Field

Wiring

Actuator A Actuator B

Neutral Live

Open

Motor Motor

Field

Wiring

SPDT

Switch

Actuator A Actuator B

Correct WiringIncorrect Wiring

Wiring_correctandincorrect

Figure 3: Correct and Incorrect Wiring Schematics

VA-9070 Series Electric Rotary Actuators Technical Bulletin 7

To set up and adjust the actuator, use the following procedure:

Setup and

Adjustment 1. Set up and adjust the electrical travel switches and manual travel stops.

See the Electrical Travel Switches and Manual Travel Stop

Adjustments section in this document.

2. Set the potentiometer. See the Setting the Potentiometer section in this

document.

3. Set the servo. See the Setting the Servo section in this document.

You must set the electrical travel switches to trigger prior to reaching the

mechanical travel stops. The travel switches are labeled for open and

close. The cams are color-coded (green for open; red for closed).

Electrical Travel

Switches and

Manual Travel

Stop Adjustments Manual travel stops are designed to prevent manual overtravel, not to stall

the electric motor. The travel stops have an adjustment range of

approximately 10 degrees.

Set_limit

Figure 4: Setting the Travel Limit Switches

8VA-9070 Series Electric Rotary Actuators Technical Bulletin

Close Adjustment

1. Loosen the mechanical stop for the closed position and back it off so

that it does not interfere with actuator travel (the closed stop is located

on the right when viewed from the travel stop side of the actuator).

Setting the Input

Control Signal

2. Remove the indicator rotor by pulling it up. This action exposes the

machined groove on the end of the camshaft, which is the reference for

the valve disc position.

3. Manually operate the actuator hand wheel Clockwise (CW) until the

valve reaches the desired closed position.

4. Rotate the red adjusting knob by hand or with a flat-head screwdriver

until the cam lobe just trips the switch from a CW direction.

5. If the rotation of one cam moves the other cam, hold the other knobs

or cams during adjustment.

6. With the travel switch in the closed position, rotate the handwheel CW

half a turn. Turn the closed travel stop CW until it bottoms out against

the output gear. Lock it in position with the locknut.

Open Adjustment

Manually operate the actuator hand wheel CCW until the valve is fully

open. Follow the same procedure as outlined in the Close Adjustment

section, except use the green cam (open) and the travel stop located on the

left side (when viewed from the travel stop side of the actuator).

Set the input control signal for the input type used.

• 4 to 20 mA – no wire jumper

• 0 to 10 VDC – wire jumper from CB OPEN to Common (next to CB

OPEN).

• 2 to 10 VDC – wire jumper from CB CLOSE to Common (next to

CB OPEN).

See Figure 2 for the location of the input control signal selection

terminals.

VA-9070 Series Electric Rotary Actuators Technical Bulletin 9

1. Manually operate the actuator handwheel until the unit is in the fully

closed position.

Setting the

Potentiometer

2. Rotate the black potentiometer drive gear adjustment knob to just

engage the potentiometer gear segment at the closed position.

3. Manually operate the actuator to the fully open position.

4. Fine-tune the potentiometer adjustment at this end to equalize the

difference between the ends. The potentiometer gear segment should

maintain engagement with the drive gear throughout full actuator

travel.

1. Wire the input signal to the incoming command signal terminals.

Ensure that you maintain proper polarity when making wiring

connections.

Setting the Servo

2. Connect the power supply and activate the actuator.

3. Check the Status Light-Emitting Diode (LED).

If the red Status LED is flashing, consult the Servo Troubleshooting

section in this document.

If the green Status LED is flashing, press and hold the CALIBRATE

button until the green Status LED flashes rapidly (approximately

2 seconds), then release the CALIBRATE button. The servo drives the

valve to the open and close travel limit switch settings. When the

calibration is complete, the green Status LED resumes flashing at the

normal rate.

If the Status LED alternately flashes red, then green, the calibration

has failed. To resolve the problem, consult the Servo Troubleshooting

section in this document.

4. After calibration is complete, apply the desired minimum and

maximum input signals and observe the actuator operation through one

full cycle for proper operation.

10 VA-9070 Series Electric Rotary Actuators Technical Bulletin

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