Johnson Controls VA-9070 Series User manual

Technical Bulletin
Issue Date March 14, 2005
©2005 Johnson Controls, Inc. 1
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
RED
BLUE
BLUE
A
B
C
D
CLOSE N.O.
(VOLTAGE FREE)
OPEN N.O.
(VOLTAGE FREE)
COM
COM
COM
N.O.
N.O.
N.O.
N.O.
N.O.
N.C.
N.C.
N.C.
N.C.
N.C.
AUX OPEN
OPEN
GREEN
CAM
RED
CAM
COM
CLOSE
AUX CLOSE
OVERRIDE SW
COM
1
2
3
4
5
6
7
8
9
YELLOW
BLUE
BLUE
BLUE
RED
RED
RED
YELLOW
HEATER (OPTIONAL)
Ground Ground
Open
Close
For Heater
Only
Close
Open
Neutral
Live Blue
Red
Yellow or
Black
OC
N
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
Red
Blue
Blue
N.O.
N.O.
Com
Com
A
B
C
D
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
+5
Common
CB OPEN
CB CLOSE
Common
Handwheel
Common
OP Torque
CL Torque
Common
Close Limit
Open Limit
13
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
Open
Motor Motor
Close
Close
DPDT
Switch
Field
Wiring
Actuator A Actuator B
Neutral Live
Open
Open
Motor Motor
Close
Close
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