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

Accessories
Potentiometers for external feedback are available for field installation on
VA-9071, VA9072, VA-9073, VA-9074, VA-9075, VA-9076, VA-9077,
and VA-9078 actuators.
IMPORTANT: In special instances where dual potentiometers are required
(when a servo is installed and an external feedback potentiometer is also
required), you must make modifications to the switch plate, including locating,
drilling, and tapping two new mounting holes. Consult the local Bray
representative for instructions.
External Feedback
Potentiometer for
Actuators without
Servos
Potentiometer
Figure 5: Potentiometer for VA-907x Series Actuators
Contents of the Feedback Potentiometer Kit
• one potentiometer assembly
Note: The assembly is different for VA-9071 and VA-9072 actuators
compared with VA-9073, VA-9074, VA-9075, VA-9076,
VA-9077, and VA-9078 actuators.
• two No. 6 cross-drive pan-head screws
• two No. 6 internal lock washers
• one ten-point terminal strip (nine-point for VA-9071 and VA-9072
actuators)
• one terminal strip marker for auxiliary switches and/or feedback
potentiometer
• one small wiring diagram sticker for the additional potentiometer
VA-9070 Series Electric Rotary Actuators Technical Bulletin 11

Tools Required
For terminal wiring: 3/16 in. (5 mm) blade screwdriver
For potentiometer mounting screws: No. 2 Phillips screwdriver
Installation Procedure
1. Install the potentiometer next to the camshaft, where the two threaded
holes are provided.
2. Mount the potentiometer in the correct orientation with its gear
centered so that it meshes with the potentiometer drive gear.
3. Push the assembly towards the cam to mesh the potentiometer gears,
and tighten the mounting screws.
Install_potentiometer
Figure 6: Installing the Feedback Potentiometer
4. Move the wiring from the six-point strip to the new terminal strip,
reconnecting the wiring in the same positions.
5. Wire the potentiometer to the terminal strip using the small stick-on
wiring diagram provided. See Figure 7.
12 VA-9070 Series Electric Rotary Actuators Technical Bulletin

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 7: Typical Wiring Diagram of VA-9070 Series Two-Position Electric
Rotary Actuator (Shown with Heater and Auxiliary Switches)
6. Adhere the wiring diagram sticker to the inside of the cover.
Setting the Potentiometer
1. Manually operate the actuator hand wheel until the actuator is in the
fully closed position.
2. Rotate the black potentiometer drive gear adjustment knob to just
engage the potentiometer gear segment at the closed position. The
closed position is indicated by a raised black dot.
3. Manually operate the actuator to its fully open position.
4. Fine-tune the potentiometer adjustment at this end to equalize the
difference between the open and closed ends. The potentiometer gear
segment should maintain engagement with the drive gear throughout
full actuator travel. If this is not the case, either the travel is exceeding
90 degrees or the potentiometer is mounted backwards.
VA-9070 Series Electric Rotary Actuators Technical Bulletin 13

Troubleshooting Procedures
Actuator
Troubleshooting See Table 1 for actuator troubleshooting information.
Table 1: Actuator Troubleshooting Chart
Problem Possible Cause Solution
Override is engaged. Push hand wheel in all the way.
Wiring is incorrect. Check wiring and power supply.
Actuator does not
operate.
Actuator has reached its thermal shutdown
temperature. Allow time to cool.
Actuator operates in
reverse directions. Field wiring is reversed. Rewire field wiring.
Limit switches are tripping. Readjust travel limit switches.
Mechanical travel stop is stopping actuator. Adjust mechanical travel stops.
Valve torque requirement is higher than actuator
output. Manually override out of seat; try angle seating or larger actuator.
Optional torque switches are tripping. Valve torque exceeds actuator torque
rating; consult the local Bray
representative.
Actuator does not
fully close valve.
Voltage power supply is low. Re-size actuator; consult the local
Bray representative.
Travel limit switches tripping. Readjust travel limit switches.
Mechanical travel stop is stopping actuator. Adjust mechanical travel stops.
Optional torque switches are tripping. Mechanical travel stops are hitting
prior to electrical limit switch.
Actuator does not
fully open valve.
High valve torque. Obtain higher capacity actuator.
Override pin is corroded or damaged. Clean and check for smooth operation
of the override switch pin.
Engaging override
hand wheel does
not shut off motor. Override switch is damaged. Replace switch.
Not completely disengaged. Push hand wheel in as far as possible
(no yellow showing).
Override pin is damaged and does not trigger
switch. Replace override pin.
Disengaging
override hand wheel
does not restart
motor.
Incorrect wiring of override switch. Check wiring.
Motor runs but
worm and gear
segment do not run.
Worm gear segment is not meshing with worm. Remove switch plate and inspect;
adjust travel stops to prevent problem.
Condensation forming. Test heater wiring; should have
constant power.
Corrosion inside
actuator. Water leaking in. Check all seals and possible water
entry through conduit.
Actuator moves
back and forth near
set point (hunts).
Signal has interference. Shield signal from interference.
Continued on next page . . .
14 VA-9070 Series Electric Rotary Actuators Technical Bulletin

Problem (Cont.) Possible Cause Solution
Potentiometer gear was not meshed correctly. Adjust the potentiometer drive
gear to maintain engagement
Actuator is electrically operating beyond the
90 degree travel limit. Set electrical travel limit switches for less than 90
degrees of operation.
Potentiometer gear
disengages from
potentiometer drive gear.
Actuator has been manually operated beyond
the 90 degree travel limit. Set mechanical travel limits for 90 degrees of operation.
Travel limit switches are not set correctly. Set travel limit switches for
90 degrees of operation.
Actuator does not travel
fully open or fully closed.
Mechanical travel stops are not set correctly. Set mechanical travel stops for
90 degrees of operation.
Actuator motor does not
run and yellow servo
power light is off.
Power is disconnected. Reconnect power.
Potentiometer gear is not engaged. Engage and adjust
potentiometer gear.
Actuator does not
properly respond to
command signal. Command signal jumper position is not correct.
Jumper is missing or should be installed. Install or remove jumper. Then use Autocalibrate button to
recalibrate servo.
Wiring is incorrect. Inspect and correct wiring.
Potentiometer is wired backwards. Reverse black and gray wires;
see wiring diagram inside cover.
Limit switch or torque switch is triggered. Ensure connections to servo
from these switches are shorted.
Actuator runs in one
direction only.
Command signal jumper position is not correct.
Jumper is missing or should be installed. Install or remove jumper. Then use Autocalibrate button to
recalibrate servo.
VA-9070 Series Electric Rotary Actuators Technical Bulletin 15

The Status LED is a bi-color (red or green) LED that provides information
on the operation of the servo. Whenever the LED flashes green, the servo
operates, although it may not operate at optimal levels. Whenever the LED
flashes red, the servo does not operate. The servo uses sequences of
flashes to give troubleshooting indications. See Table 2.
Servo
Troubleshooting
The LED Flash codes are prioritized. The red flash codes take precedence
over the green flash codes. The lowest number flash codes take
precedence over the higher numbered flash codes. After resolving a
problem, the next highest flash code appears.
Table 2: Troubleshooting by the Status LED
Flash Sequence*
Meaning Code
Flash
1 Flash 2 Flash 3 Flash 4 Flash 5 Flash 6 Flash 7 Flash 8
Normal Operation 1 green unlit green unlit green unlit green unlit
Control Signal
Calibration Warning 2 green green unlit unlit unlit unlit unlit unlit
Feedback
Potentiometer
Calibration Warning
3 green green green unlit unlit unlit unlit unlit
Reverse Acting
Warning 4 green green green green unlit unlit unlit unlit
Split Range 0 to 50%
Warning 5 green green green green green unlit unlit unlit
Split Range
50 to 100% Warning 6 green green green green green green unlit unlit
Calibration in
Progress 7 green green green green green green green green
Hand Wheel Is
Engaged (Pulled
Outward)
8 red unlit unlit unlit unlit unlit unlit unlit
Command Signal
Failure (0-20 mA,
4-20 mA modes only)
9 red red unlit unlit unlit unlit unlit unlit
Feedback
Potentiometer Failure 10 red red red unlit unlit unlit unlit unlit
Open and Close Limit
Switch Failure 11 red red red red unlit unlit unlit unlit
Open Torque Limit
Reached 12 red red red red red unlit unlit unlit
Close Torque Limit
Reached 13 red red red red red red unlit unlit
Feedback
Potentiometer Wired
Reverse
14 red red red red red red red unlit
General Servo
Failure 15 red red red red red red red red
Immediately
Displayed after an
Invalid Calibration
16 red green red green red green red green
* The LED flash rate interval (the time to completely cycle the LED from Off to On) is 1/2 second, except for
Normal Operation mode, which is 1 second.
16 VA-9070 Series Electric Rotary Actuators Technical Bulletin

Green LED
A flashing green LED provides status and warning information. The servo
operates normally in this state.
Some flash codes indicate a warning, where the servo recovers
automatically, such as the indication of an invalid calibration. In this case,
default calibration automatically loads. This allows the servo to operate,
but it may not be a perfect match to the actuator. If this happens,
recalibrate the servo as soon as possible.
To recalibrate the servo, 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.
Table 3: Green LED Warning and Information Flash Codes
Code Description Meaning
1 Normal Operation The servo detects no errors and operates normally.
2 Control Signal
Calibration Error If this error occurs, add or remove jumpers for the input type. See the Setting the Input Control Signal section.
3 Feedback
Potentiometer
Error
An invalid feedback potentiometer calibration is detected.
To ensure a valid feedback calibration, ensure that these
conditions exist.
• The upper limit calibration is greater than the lower
limit calibration.
• The difference between the upper and lower limits is
at least 3 volts.
• The feedback potentiometer is not wired backwards.
4 Calibration in
Process The green LED flashes rapidly during this operation.
5 Reverse Acting
Warning This warning indicates that the servo is configured to operate in the Reverse Acting Mode.
6 Split range 0 to
50% Warning This warning indicates that the servo is configured to operate in the Split Range 0 to 50% range mode.
7 Split range 50 to
100% Warning This warning indicates that the servo is configured to operate in the Split Range 50 to 100% range mode.
8 Calibration in
Process During a calibration, the LED flashes rapidly at one-half second intervals. When the calibration is complete, the
LED resumes with the Normal Operation flash code
(Code 1) unless another warning is still pending.
Note: If you detect error codes 3, 5, 6, or 7, contact your
Bray representative for further information.
VA-9070 Series Electric Rotary Actuators Technical Bulletin 17

Red LED
A flashing red LED indicates a fault condition that prevents the actuator
from operating. Correct the fault condition to allow the actuator to resume
operating. If you detect error Code 16, contact your Bray representative
for further information.
Table 4: Red LED Warning and Information Flash Codes
Code Description Meaning
9 Hand Wheel Is
Engaged (Pulled
Outward)
When the hand wheel is engaged, the servo can only
be operated manually. This error also occurs if the
hand wheel switch is incorrectly connected to the
servo.
10 Command Signal
Failure When the servo is configured to operate in the 0 to 20 mA mode, an input greater than 20 mA triggers
an error. When the hand wheel is configured to run in
4 to 20 mA operating mode, an input less than 4 mA or
greater than 20 mA triggers an error. The Command
Signal is not checked in the 0 to 10V mode.
11 Feedback
Potentiometer
Failure
If the feedback potentiometer cannot be detected, or if
in the fully closed or fully open position and the
feedback potentiometer is at the end of its travel, an
error is detected.
12 Open and Close
Limit Switch Failure When both the open and close limit switches are open-circuited at the same time, an error is detected.
13 Open Torque Limit
Reached The open torque limit switch has been tripped or the open torque limit switch is incorrectly connected to the
servo.
14 Close Torque Limit
Reached The close torque limit switch has been tripped or the close torque limit switch is incorrectly connected to the
servo.
15 Feedback
Potentiometer Wired
in Reverse
This check is made only during the servo
autocalibration. The Feedback potentiometer is wired
in reverse when at the completion of the calibration,
the feedback potentiometer value at the fully open
position is less than the value at the fully closed
position. To clear the error, turn off the power to the
servo, correct the Feedback Potentiometer wiring, turn
on the power to the servo, and complete the
autocalibration.
16 General Servo
Failure If after cycling the power to the servo, this error persists, contact your local Bray representative for
assistance.
17 Calibration Error This flash code is displayed after a failed calibration for
3 seconds. See Code 2 and Code 3 in Table 3 for
more information.
18 VA-9070 Series Electric Rotary Actuators Technical Bulletin

Disassembly and Assembly
General
Information
Tools Required
VA-9070 Series actuators are differentiated into two groups:
• VA-9071 and VA-9072 actuators
• VA-9073, VA-9074, VA-9075, VA-9076, VA-9077, and VA-9078
actuators
Table 5: Basic Tools
Common to All Actuators
Terminal Connections, Cam Adjustment Screwdriver, 3 to 4 Tip
Blade
All Switches, Terminal Strip, Torque Switch Plate Screwdriver, No. 1 Phillips
Switch Plate Screws, Capacitor Screwdriver, No. 2 Phillips
Servo Trimmer Potentiometers Screwdriver, Blade for Trim
Potentiometers
VA-9071 and VA-9072 Actuators
Mounting Nuts Wrench, 1/2 in. (13 mm)
Cover Captivated Cap Screws Hex Key, 1/4 in. (6 mm)
Travel Stop Adjusting Studs Hex Wrench, 1/8 in. (3 mm)
Travel Stop Jam Nuts Wrench, 7/16 in. (11 mm)
Motor Mount Socket Flat-Head Cap Screw Hex Key, 3/32 in. (2 mm)
Motor Mount Socket-Head Cap Screw Hex Key, 9/64 in. (4 mm)
VA-9073, VA-9074, VA-9075 and VA-9076 Actuators
Mounting Nuts (Small Pattern), Travel Stop Jam Nuts Wrench, 1/2 in. (13 mm)
Mounting Nuts (Large Pattern) Wrench, 3/4 in. (19 mm)
Cover Captivated Cap Screws Hex Key, 5/16 in. (8 mm)
Travel Stop Adjusting Studs Hex Key, 3/16 in. (5 mm)
Motor Mount Socket-Head Cap Screw Hex Key, 5/32 in. (4 mm)
VA-9077 and VA-9078 Actuators
Mounting Nuts, Travel Stop Jam Nuts Wrench, 3/4 in. (19 mm)
Cover Captivated Cap Screws Hex Key, 3/8 in. (10 mm)
Travel Stop Adjusting Studs Hex Key, 1/4 in. (6 mm)
Motor Mount Socket-Head Shoulder Bolt Hex Key, 5/32 in. (4 mm)
Motor Mount Socket-Head Cap Screws Hex Key, 3/16 in. (5 mm)
VA-9070 Series Electric Rotary Actuators Technical Bulletin 19

1. Disconnect all power to the actuator and remove the cover. See
Figure 8.
Procedure for
VA-9071 and
VA-9072 Actuators
Actuator_no cover
Figure 8: Actuator with Cover Removed
2. Disconnect the motor wires from the main terminal block (motor
close, motor open, and neutral).
3. Remove the switch plate by unscrewing the seven Phillips-head
mounting screws. The switch plate should lift out as an assembly with
the camshaft attached. See Figure 9.
20 VA-9070 Series Electric Rotary Actuators Technical Bulletin