Repair Information, Servo Commissioning | Johnson Controls VA-9070

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 bottoms out against the output gear. Lock the travel stop bolts.

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).

Servo Commissioning

Ensure that the travel switches and travel stops are set properly before calibrating the servo. Use a controlled and known command signal source. Factory-installed servos are pre-calibrated.

Setting the Input Control Signal

Set the input control signal for the input type used. See Table 1.

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.

Table 1: Input Control Signal Switch Settings

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, refer to the Servo Troubleshooting section in the VA-9070 Series Electric Rotary Actuators Technical Bulletin (LIT-977325).

•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, refer to the Servo Troubleshooting section in the VA-9070 Series Electric Rotary Actuators Technical Bulletin (LIT-977325).

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.

Repair Information

If the VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service fails to operate within its specifications, replace the unit. For a replacement VA-9070 Series actuator, contact the nearest Johnson Controls® representative.

Switch			Input Signal

	4 to 20 mA	DC 0 to 5 V		DC 0 to 10 V	DC 2 to 10 V

1	OFF	ON		ON	ON

2	OFF	OFF		ON	ON

3	OFF	OFF		OFF	ON

Controls Group	Metasys® is a registered trademark of Johnson Controls, Inc.
507 E. Michigan Street	All other marks herein are the marks of their respective owners.
Milwaukee, WI 53202	© 2007 Johnson Controls, Inc.

2 VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Installation Instructions

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VA-9070 specifications

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