Johnson Controls VA-9070 Series Technical Bulletin Download

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VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin

Servo Troubleshooting

Refer to the actuator manual before adjusting or replacing any actuator
components. Before testing or acting on any possible issues, check for any active
faults.

WARNING: Risk of electric shock

Turn off all power and lockout/tag out service panel before installing or modifying any
electrical wiring.

Table 2: Servo Troubleshooting Chart

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/or 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.

Pin/Key on Worm/Motor drive gear

sheared.

Replace Pin/Key on drive gear.

Corrosion inside

actuator.

Condensation forming.

Test heater wiring; should have constant

power.

Water leaking in.

Check all seals and possible water entry

through conduit.

Problem

Possible Cause

Solution

Servo NXT does not

turn on when power

is applied

Fuse is blown

Verify and replace fuse

Servo NXT is incorrectly wired

Verify wire connections against the wiring

diagram

Servo NXT is not receiving power

Test the Input Power connection with a

multimeter or oscilloscope

Power is not correct

Check the provided power against the

voltage listed for the Servo NXT and

actuator

Actuator moves

back and forth near

setpoint (hunting)

Deadband is too narrow

Increase the deadband setting

Excessive noise on the signal lines

Use an oscilloscope to test for the presence

of EMI.
Utilize EMI reducing techniques to mitigate

the issue.

Servo NXT not

responding to

command signal

Servo NXT in local mode

If local control is being used

, ensure the

local control station is not active or is set to

remote mode.

Servo NXT in manual or autocalibration

mode

Check the indicators for manual or

autocalibration mode

Servo NXT is incorrectly wired

Verify wire connections against the wiring

diagram

Table 1: Actuator Troubleshooting Chart (Part 2 of 2)

Problem

Possible Cause

Solution

Summary of Contents for VA-9070 Series

Page 1: ...and Manual Travel Stop Adjustments 8 Setting Travel Limit Switches 8 Setting the Potentiometer 9 Calibrating the Servo 9 Accessories 10 External Feedback Potentiometer for Actuators without Servos 10 Contents of the Feedback Potentiometer Kit 11 Tools Required 11 Installation Procedure 11 Setting the Potentiometer 12 Troubleshooting Procedures 12 Actuator Troubleshooting 12 Servo Troubleshooting 1...

Page 2: ... Bulletin 2 General Information 17 Tools Required 17 Procedure for VA 9072 Actuators 18 Procedure for VA 9075 VA 9076 VA 9077 VA 9078 VA 907A and VA 907B Actuators 23 Appendix A 27 VA 9072 Actuators 27 VA 9075 Actuator 29 VA 9076 VA 9077 VA 9078 VA 907A and VA 907B Actuators 31 Appendix B 35 ...

Page 3: ... 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 120V motor in the VA 9070 Series actuator is a permanent induction split capacitor design single phase AC power The 24VAC motor in the VA 9070 Series actuator is ...

Page 4: ...onduit 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 ...

Page 5: ...he 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...

Page 6: ...tuator 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 O C N Motor FIG 977319_Fig2 ...

Page 7: ...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 ...

Page 8: ...rformance 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 potentiometer See the Setting the Potentiometer section in this document 3 Calib...

Page 9: ... Controls uses cam design along with 2 SPDT mechanical switches to set the open and closed position of the valve The green cam actuates the open switch when the actuator reaches the open position Similarly the red cam actuates the closed switch when the actuator reaches the closed position Standard factory setting of the travel limit switches means 90 travel between open and close positions Cams f...

Page 10: ... 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 throu...

Page 11: ...eration 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...

Page 12: ...d 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 use the two threaded holes 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 pot...

Page 13: ...uator troubleshooting information Table 1 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 motor has reached its thermal shutdown temperature Allow time to cool Actuator operates in reverse directions Field wiring is reversed Rewire field ...

Page 14: ...Test heater wiring should have constant power Water leaking in Check all seals and possible water entry through conduit Problem Possible Cause Solution Servo NXT does not turn on when power is applied Fuse is blown Verify and replace fuse Servo NXT is incorrectly wired Verify wire connections against the wiring diagram Servo NXT is not receiving power Test the Input Power connection with a multime...

Page 15: ...ctions against the wiring diagram Hand wheel switch failure Test the switch to ensure that it is changing states when engaged FB pot fault Potentiometer outside of travel range Operate the actuator to the fully open and fully closed position and adjust the potentiometer position as needed Servo NXT is incorrectly wired Verify wire connections against the wiring diagram Torque switch fault Torque s...

Page 16: ...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 ope...

Page 17: ...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...

Page 18: ...ptivated 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 7 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 Wre...

Page 19: ...ervice 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 ...

Page 20: ...ating Service Technical Bulletin 20 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 7 and Figure 8 Figure 8 Removing the Switch Plate Two Position Actuator ...

Page 21: ...A 9070 Series Electric Rotary Actuators for Two Position and Modulating Service Technical Bulletin 21 4 Disassemble the switch plate See Figure 9 Figure 9 Disassemble the Switch Plate Modulating Actuator ...

Page 22: ...22 5 Disconnect the motor leads that run to the capacitor plug in connectors and then unscrew the three mounting screws two lower and one upper See Figure 10 6 Vertically remove the gear motor out of the actuator See Figure 10 Do not misplace the alignment pin FIG rmv_mtr Figure 10 Removing the Motor ...

Page 23: ...oth mechanical travel stops Manually override the worm gear until it disengages the worm Remove the retaining ring and thrust washer then lift the output drive worm gear out of its bushing See Figure 11 9 Remove the capacitor See Figure 10 Note A spring pin holds the handwheel in place Further disassembly of the actuator requires special tools and procedures and is not covered in this document The...

Page 24: ... 9076 VA 9077 VA 9078 VA 907A and VA 907B Actuators 1 Disconnect all power to the actuator and remove the cover See Figure 12 2 Remove the field wiring and the internal motor wiring from the terminal strips See Figure 13 Figure 12 Two Position Actuator with Cover Removed Figure 13 Removing the Switch Plate Two Position Actuator ...

Page 25: ...sition and Modulating Service Technical Bulletin 25 3 Remove the switch plate by unscrewing the seven Phillips head mounting screws and then pull up on the switch plate to remove it See Figure 14 Figure 14 Two Position Actuator with Switch Plate Removed ...

Page 26: ...072 Series Actuator has two lower mounting screws and one upper mounting screw The VA 9075 Series Actuators have four lower mounting screws and one upper mounting screw The VA 9076 through VA 907B Series Actuators have four lower mounting screws one upper mounting screw and one lower locating screw 6 Remove the motor vertically out of the actuator See Figure 15 Note Do not misplace the alignment p...

Page 27: ...ps Note This is not needed on the VA 9076 through VA 907B Series Actuators 9 Manually override the worm gear until it disengages the worm Note This is not needed on the VA 7076 through VA 907B Series Actuators 10 Remove the seal and retaining ring then lift the output drive worm gear out of its bushing See Figure 16 Further disassembly of the actuator requires special tools and procedures and is n...

Page 28: ... 51 Retaining Ring 15 Heater Bracket Screw 52 Thrust Washer 16 Heater Mounting Bracket 53 Base 17 Heater 54 Conduit Plug 18 Override Switch 55 Name Tag 19 Override Switch Insulator 56 Bushing 20 Override Switch Screw 57 Drive Gear Pin 21 Override Switch Trigger Pin 58 Drive Gear 22 Torque Switch Cover 59 Terminal Strip 23 Switch Plate Ball Bearing 60 Capacitor 24 Retaining Ring 61 Gearmotor 25 Cou...

Page 29: ...VA 9070 Series Electric Rotary Actuators for Two Position and Modulating Service Technical Bulletin 29 Figure 17 VA 9072 Two Position Actuators Exploded View ...

Page 30: ... Limit Switches 52 Disc Spring 15 Limit Switch Insulator 53 Disc Spring 16 Heater Bracket Screw 54 Worm 17 Heater Mounting Bracket 55 Spring Pin 18 Heater 56 Retaining Ring 19 Override Switch Trigger Pin 57 Thrust Washer 20 Override Switch 58 Base 21 Override Switch Insulator 59 Conduit Plug 22 Override Switch Screw 60 Name Tag 23 Switch Plate Ball Bearing 61 Bushing 24 Retaining Ring 62 Gear Spac...

Page 31: ...VA 9070 Series Electric Rotary Actuators for Two Position and Modulating Service Technical Bulletin 31 Figure 18 VA 9075 Actuator VA 9075 Actuator ...

Page 32: ...Bracket Screw 52 Spherical Washer 15 Heater Mounting Bracket 53 Disc Spring 16 Heater 54 Worm 17 Override Switch Trigger Pin 55 Spring Pin 18 Override Switch 56 Retaining Ring 19 Override Switch Insulator 57 Thrust Washer 20 Override Switch Screw 58 Base 21 Ground Terminal Screw 59 Conduit Plug 22 Ground Terminal Washer 60 Name Tag 23 Switch Plate Ball Bearing 61 Bushing 24 Retaining Ring 62 Drive...

Page 33: ...VA 9070 Series Electric Rotary Actuators for Two Position and Modulating Service Technical Bulletin 33 Figure 19 VA 9076 VA 9077 and VA 9078 Two Position Actuators Exploded View ...

Page 34: ...g Ring 12 Heater Bracket Screw 48 Thrust Washer 13 Heater Mounting Bracket 49 Base 14 Heater 50 Conduit Plug 15 Override Switch 51 Name Tag 16 Override Switch Insulator 52 Bushing 17 Override Switch Screw 53 Drive Gear Key 18 Switch Plate Ball Bearing 54 Drive Gear 19 Retaining Ring 55 Retaining Ring 20 Coupler 56 Gear Motor 21 Worm Wheel 57 Dowel Pin 22 O Ring 58 Lock Washer 23 Capacitor 59 Motor...

Page 35: ...VA 9070 Series Electric Rotary Actuators for Two Position and Modulating Service Technical Bulletin 35 Figure 20 VA 907A and VA 907B Two Position Actuators Exploded View ...

Page 36: ...g Screw 2 Position Indicator Plate 3 Position Indicator Gasket 4 Actuator Gear Box Gasket 5 Dowel Pin 6 O Ring 7 Washer Flat Nylon 8 Nut Hex 9 Bolt Hex Hd 10 Cover 11 Washer Conical 12 Actuator Gear Box Fastening Screw 13 Output Gear Bearing 14 Idler Input Gear Bearing 15 Cover Gasket 16 Input Gear 17 Output Gear 18 Idler Gear 19 Cover 20 Lock Washer 21 Base Fastening Screw ...

Page 37: ...VA 9070 Series Electric Rotary Actuators for Two Position and Modulating Service Technical Bulletin 37 Figure 21 VA 907A and VA 907B 3 1 Gear Box Exploded View ...

Page 38: ...able 14 Actuator Codes and Valve Assembly Actuator Suffix Electric Modulating Models Electric Two Position Models Johnson Controls Actuator Only Code Number Johnson Controls VF Series Butterfly Valve Assembly Actuator Suffix Johnson Controls Actuator Only Code Number Johnson Controls VF Series Butterfly Valve Assembly Actuator Suffix VA 9072 01 702 VA 9072 02 722 VA 9075 01 703 VA 9075 02 723 VA 9...

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