Johnson Controls VA-9070 Series Service manual

1VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating
Service Technical Bulletin
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Internal and External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mechanical Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Manual Override Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pre-installation Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Multiple Actuator (Parallel) Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setup and Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Travel Switches and Manual Travel Stop Adjustments . . . . . . . . . . . . . . . . . . . . . 9
Closed Travel Switch and Travel Stop Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Open Travel Switch and Travel Stop Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Setting the Input Control Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Setting the Potentiometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Setting the Servo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
External Feedback Potentiometer for Actuators without Servos . . . . . . . . . . . . . . . . . . . . . 11
Contents of the Feedback Potentiometer Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Potentiometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Actuator Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Servo Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
VA-9070 Series Electric Rotary Actuators for
Two-Position and Modulating Service
Technical Bulletin Code No. LIT-977325
Issued August 15, 2014

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin2
Green LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Red LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Disassembly and Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Procedure for VA-9072 Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Procedure for VA-9075, VA-9076, VA-9077, VA-9078, VA-907A, and VA-907B Actuators 24
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
VA-9072 Actuators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
VA-9075 Actuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
VA-9076, VA-9077, VA-9078, VA-907A, and VA-907B Actuators . . . . . . . . . . . . . . . . . . 32
Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 3
VA-9070 Series Electric Rotary Actuators for
Two-Position and Modulating Service Technical
Bulletin
Introduction
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 18,000 lb·in (2034 N·m) of torque.
VA-9070 Series electric actuators cannot be used on the VF4000 Series and
VF5000 Series Butterfly Valves. Operating speeds vary between 6 and 60 seconds.
Internal and External Components
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 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 has
several 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 handwheel, and dual conduit entry
ports. The external coating is a polyester powder coat, providing resistance to
Ultraviolet (UV) radiation exposure and chemical exposure.
Electrical Operation
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.
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.
Mechanical Operation
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.

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin4
Manual Override Operation
The manual override operates similarly to the adjusting knob on a mechanical
wristwatch. To engage the manual override, pull the handwheel to its outermost
position. When the manual override engages, the actuator stops electrical
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.
Spring plungers hold the two handwheel positions (engaged and disengaged) in
place. The handwheel remains in position until physically moved. Rotating the
handwheel in a clockwise direction rotates the output shaft in the same clockwise
(closed) direction. Rotating the handwheel in a counterclockwise direction rotates
the output shaft in the same counterclockwise (open) direction.
Pre-installation Storage
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.
Installation
Mounting
VA-9070 Series electric actuators are suitable for direct mounting on
Johnson Controls VF Series Butterfly Valves. VA-9070 Series Electric Actuators
cannot be used on the VF4000 and VF5000 Series Butterfly Valves. Installing the
VA-9070 Series actuator onto other quarter-turn valves or devices requires proper
mounting hardware.
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.

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 5
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.
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.
Figure 1 shows typical field wiring for a two-position actuator, whereas Figure 2
shows typical field wiring for a modulating actuator.

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin6
Figure 1: Typical Wiring Diagram of VA-9070 Series Two-Position Electric Rotary
Actuator
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
Ground Ground
Open
Close
For Heater
Only
Close
Open
Neutral
120 VAC Blue
Red
Yellow or
Black
OC
N
Motor
FIG:977319_Fig2

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 7
Figure 2: Typical Wiring Diagram of VA-9070 Series Modulating Electric
Rotary Actuator
Calibrate Status
Input (-)
Input (+) +5 VOLTS
Output (-)
Output (+)
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
HTR
+5 VDC at 50 mA
(If Required)
-
-
+
+
Neutral
120 VAC
Ground
Outgoing
Feedback
Signal
1,2
Single
Phase
Supply
Heater
Incoming
Command
Signal
1
FIG:fldwrng
FUSE
Open Speed
Close Speed
Deadband
ON
12345678910
A
B
C D
WHT
BLK
WHT -
ORN
GRY +
Feedback Potentiometer
Green
Cam
Red Cam
N.O.
N.O.
Com
Com
Com
Com
Com
N.O.
N.O.
N.O.
N.C.
N.C.
N.C.
Manual Override Switch
Torque Switch
CLOSE
OPEN
BLU
RED
YLW
or BLK
OC
N
Motor
YLW
YLW
BLU
BLU N.C.
N.C.
RED
RED
4-20 mA 4-20 mA
0-5 V 0-5 V
0-10 V 0-10 V
2-10 V
ON ON
ON
ON
ON
ON ON
ON
ON ON
ON ON
ON
ONOFF OFF
OFF OFF
OFF
OFF
OFF OFF
OFF
OFF OFF
OFF
OFF OFF OFF
Switch Switch
Switch Switch
Switch
Switch
COMMAND INPUT COMMAND OUTPUT
14
25
36
REVERSE
ACTING
FORWARD
ACTING
FAIL
DISABLE FAIL
ENABLE
FAIL
CLOSE FAIL
OPEN
TORQUE SW
ENABLE TORQUE S
W
DISABLE
9
10
7
8
1 - Isolate the command signal and the feedback signal from each other and any other circuits. 2 - The servo powers the feedback loop. Do not supply external power.
ORN
ORN
PRP
PRP

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin8
Multiple Actuator (Parallel) Wiring
Use a multiple pole switch to connect two VA-9070 Series electric actuators. See
the Correct Wiring schematic in Figure 3.
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.
Setup and Adjustment
To set up and adjust the actuator, use the following procedure:
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 input control signal. See the Setting the Input Control Signal section in
this document.
3. Set the potentiometer. See the Setting the Potentiometer section in this
document.
4. Set the servo. See the Setting the Servo section in this document.
Figure 3: Correct and Incorrect Wiring Schematics
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 Wiring Incorrect Wiring
FIG: wir_crrct_incrrct

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 9
Electrical Travel Switches and Manual Travel Stop Adjustments
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).
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.
Closed Travel Switch and Travel Stop 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.
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 handwheel 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 barely trips the switch from a CW direction.
Note: If the rotation of one cam moves the other cam, hold the other knobs or
cams during adjustment.
5. With the travel switch in the closed position, rotate the handwheel one-half
turn CW, then turn the closed travel stop CW until it stops against the output
gear. Lock the travel stop bolts.
Figure 4: Setting the Travel Limit Switches
FIG:set_lim

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin10
Open Travel Switch and Travel Stop Adjustment
Manually operate the actuator handwheel Counterclockwise (CCW) until the valve
is fully open. Follow the same procedure as outlined in the Closed Travel Switch
and Travel Stop Adjustment section, except use the green cam (open) and the
travel stop located on the left side (as seen when viewed from the travel stop side
of the actuator).
Setting the Input Control Signal
Set the input control signal for the input type used.
See Figure 2 for the location of the input control signal switches.
Setting the Potentiometer
1. Manually operate the actuator handwheel until the unit is in the fully closed
position.
2. Rotate the black potentiometer drive gear adjustment knob to barely 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.
Setting the Servo
1. Wire the input signal to the incoming command signal terminals. Ensure that
you maintain proper polarity when making wiring connections.
2. Connect the power supply and activate the actuator.
3. Check the Status Light-Emitting Diode (LED).
• If the red Status LED is flashing, see the Servo Troubleshooting section.
• 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 flashes green, the calibration
has failed. To resolve the problem, see the Servo Troubleshooting section.
Table 1: Input Control Signal Switch Settings
Switch Input Signal
4-20 mA DC 0 to 5 V DC 0 to 10 V DC 2 to 10 V
1OFFONONON
2OFF OFF ON ON
3OFF OFF OFF ON

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 11
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.
Accessories
External Feedback Potentiometer for Actuators without Servos
Potentiometers for external feedback are available for field installation on
VA9072, VA-9073, VA-9074, VA-9075, VA-9076, VA-9077, and VA-9078
actuators.
IMPORTANT: In special instances where dual potentiometers are required
(such as 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.
FIG:ptntmtr
Figure 5: Potentiometer for VA-907x Series Actuators

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin12
Contents of the Feedback Potentiometer Kit
• one potentiometer assembly
• two No. 6 cross-drive pan-head screws
• two No. 6 internal lock washers
• one 10-point terminal strip
• one terminal strip marker for auxiliary switches and/or feedback potentiometer
• one small wiring diagram sticker for the additional potentiometer
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.
4. Move the wiring from the six-point strip to the new terminal strip,
reconnecting the wiring in the same positions.
FIG:instl_ptntmtr
Figure 6: Installing the Feedback Potentiometer

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 13
5. Wire the potentiometer to the terminal strip using the small stick-on wiring
diagram provided.
6. Adhere the wiring diagram sticker to the inside of the cover.
Setting the Potentiometer
1. Manually operate the actuator handwheel until the unit is in the fully closed
position.
2. Rotate the black potentiometer drive gear adjustment knob to barely 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 remain engaged
with the drive gear throughout full actuator travel.
Troubleshooting Procedures
Actuator Troubleshooting
See Table 2 for actuator troubleshooting information.
Table 2: Actuator Troubleshooting Chart (Part 1 of 2)
Problem Possible Cause Solution
Actuator does not
operate. Override is engaged. Push handwheel in all the way.
Wiring is incorrect. Check wiring and power supply.
Actuator has reached its thermal shutdown
temperature. Allow time to cool.
Actuator operates in
reverse directions. Field wiring is reversed. Rewire field wiring.
Actuator does not
fully close valve. 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.
Voltage power supply is low. Resize actuator; consult the local Bray
representative.
Actuator does not
fully open valve. 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.
High valve torque. Obtain higher capacity actuator.
Engaging override
handwheel does not
shut off motor.
Override pin is corroded or damaged. Clean and check for smooth operation of
the override switch pin.
Override switch is damaged. Replace switch.

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin14
Servo Troubleshooting
The Status LED is a bicolor (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 3.
Disengaging
override handwheel
does not restart
motor.
Not completely disengaged. Push handwheel in as far as possible so
that no yellow shows.
Override pin is damaged and does not
trigger switch. Replace override pin.
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.
Corrosion inside
actuator. Condensation forming. Test heater wiring; should have constant power.
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.
Potentiometer gear
disengages from
potentiometer drive
gear.
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.
Actuator has been manually operated
beyond the 90 degree travel limit. Set mechanical travel limits for 90 degrees of operation.
Actuator does not
travel fully open or
fully closed.
Travel limit switches are not set correctly. Set travel limit switches for 90 degrees of
operation.
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.
Actuator does not
properly respond to
command signal.
Potentiometer gear is not engaged. Engage and adjust potentiometer gear.
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.
Actuator runs in one
direction only. 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.
Command signal jumper position is not
correct. Jumper is missing or should be
installed.
Install or remove jumper. Then use the
Autocalibrate button to recalibrate the
servo.
Table 2: Actuator Troubleshooting Chart (Part 2 of 2)
Problem Possible Cause Solution

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin 15
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.
Green LED
A flashing green LED provides status and warning information. The servo
operates normally in this state.
Table 3: Troubleshooting by the Status LED
Meaning Code Flash Sequence1
1. 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.
Flash
1Flash 2Flash 3Flash 4Flash 5Flash 6Flash 7Flash 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
Handwheel 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
14redredredredredredredunlit
General Servo Failure 15redredredredredredredred
Immediately
Displayed after an
Invalid Calibration
16 red green red green red green red green

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin16
Some flash codes indicate a warning condition. In a warning condition (such as the
indication of an invalid calibration), the servo recovers automatically. 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.
Note: If you detect error codes 3, 5, 6, or 7, contact your Bray representative for
further information.
Table 4: Green LED Warning and Information Flash Codes
Code Description Meaning
1Normal Operation The servo detects no errors and operates normally.
2Control Signal
Calibration Error If this error occurs, add or remove jumpers for the input type. See the Setting the Input Control Signal section.
3Feedback
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
3volts.
The feedback potentiometer is not wired backwards.
4Calibration in
Process The green LED flashes rapidly during this operation.
5Reverse Acting
Warning This warning indicates that the servo is configured to operate in the Reverse Acting Mode.
6Split Range 0 to
50% Warning This warning indicates that the servo is configured to operate in the Split Range 0 to 50% range mode.
7Split Range 50 to
100% Warning This warning indicates that the servo is configured to operate in the Split Range 50 to 100% range mode.
8Calibration 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.

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service 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 5: Red LED Warning and Information Flash Codes
Code Description Meaning
9Handwheel Is Engaged
(Pulled Outward) When the handwheel is engaged, the servo can only be operated manually. This error also occurs if the handwheel
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
handwheel 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 10 V
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 4 for more
information.

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin18
Disassembly and Assembly
General Information
VA-9070 Series actuators are differentiated into four groups, according to size:
• VA-9072 actuators
• VA-9075 actuators
• VA-9076, VA-9077, and VA-9078 actuators
• VA-907A and VA-907B actuators
Tools Required
Table 6: Basic Tools Common to All Actuators
Item Tool
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
Table 7: Basic Tools for VA-9072 Actuators
Item Tool
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)
Table 8: Basic Tools for VA-9075 Actuators
Item Tool
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)
Table 9: Basic Tools for VA-9076, VA-9077, VA-9078, VA-907A, and VA-907B
Actuators
Item Tool
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 Wrench, 3/4 in. (19 mm) [15/16 in. (8 mm) for
VA907A and VA-907B]
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 for Two-Position and Modulating Service Technical Bulletin 19
Procedure for VA-9072 Actuators
1. Disconnect all power to the actuator and remove the cover. See Figure 7.
2. Disconnect the motor wires from the main terminal block (motor close, motor
open, and neutral).
Figure 7: Two-Position Actuator with Cover Removed
FIGF:acttr_nocvr

VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin20
3. Remove the switch plate by unscrewing the seven Phillips mounting screws.
The switch plate should lift out as an assembly with the camshaft attached. See
Figure 8 and Figure 9.
FIG:rmv_swtchplt
Figure 8: Removing the Switch Plate (Two-Position Actuator)