• Rotate it to the wholly-open position with handle
• Loosen tighten-nut and rotate regulation screw in order to touch the mechanical
• link-stopper,then, rotate screw or semi-circle in anticlockwise direction for tightening nut.
• Using same method, operator could regulate mechanical link-stopper at wholly-closed position.

Note: the mechanical position-limiting should lag behind the electric limiting, or else,it would lead to heating of electric machine.

• The resistance value of potentiometer is 1 K¦¸£¬5 K¦¸
• Using handle to rotate valve to wholly-closed position
• Loosen screw of opening-gear and rotate opening gear for regulating potentiometer
• Using universal-meter to measure resistance value between 4 and 5 wiring terminals, and make the resistance value achieve 5¦¸, tighten opening gear fixing screw.(if the seven-line connector of intelligent type are connected, please measure the resistance between RV and RS jacks)

Note: operator also could loosen potentiometer for regulation, however, in case of being fixed, operator should take notice of the stitch closure between gears of potentiometer and opening, which can¡¯t be too large or small, or else, it would directly affect the complete-set precision of execution device. Note: the mechanical position-limiting should lag behind the electric limiting, or else,it would lead to heating of electric machine.

The system makes computation between input signals(4¡«20mA DC) and position signals, then turns the motor in direction to balance them, and stops the motor when they are balanced. The motor torque is transmitted through the worm structure to the actuator shaft. Rotation direction (direct or reverse) is selectable at the setting switch. The backlash revision type potentiometer detects and feedbacks the shaft positions to the control pack. The system always controls shaft position at the correlated rates with input signals.

Cautions on indoor installation

• Avoid a hazardous place, as this is not an explosion-proof type
• Cover whole the unit, when installing the unit in a place with water or material splashes
• It is recommendable to reserve a space for manual maintenance work. (Depends on installation conditions.)

Caution on outdoor installation

• To avoid rainwater or direct sunlight, it is necessary to cover or shade whole the unit.(this concerns temperature rise in the unit, and anti-climate property of seals used.)
• It is recommendable to reserve a space for manual maintenance work .(depends on installation conditions)

Note: the shining of sunshine outdoor would lead to high-temperature which accelerates ageing of components, even losing effectiveness; the rain would accelerate aging of rubber-pad, moreover, the product will be damaged if failing in waterproof conduction.

*Ambient temperature

Ambient temperature range: -30¡æ¡«+60¡æ Note: for use under negative temperature, space heater to prevent condensation is available.

*Fluid temperature

• It is occasional that if the actuator is applied to a high temperature fluid line, the unit may overheat by transmission of line heat. In such a case, use radiation type bracket and couplings are available at option.
• Standard bracket and couplings: fluid temperature max.65¡æ
• Radiation type bracket and couplings: fluid temperature over 65¡æ

*Lubrication

The unit is lubricated with long life grease before shipment, and in principle it does not require re-lubrication after shipment.

*Inspection

When starting operation after a long period of rest, make the following confirmation

• Cut power off, manually drive the unit and confirm that it moves smoothly without eccentricity.
• Remove the body covers, and check that there is no condensation inside, and wiring is proper. After inspection is over, screw up all the covers sufficiently. Insufficient screwing may cause water ingress and troubles.

TROUBLE AND PROBABLE CAUSE	SOLUTION
Motor does not start up
Power failed or dropped	Check and supply power
Signal failed or dropped	Check and input signals
Wire broken or disconnected	Change the wire or re-connect the terminal
Thermal protector functioned	Lower the ambient temperature or decrease duty rate. Eliminate overload at valve
Limit switches functioned at an intermediate position	Re-adjust the limit cam
Motor advancer defective	Change advancer (condenser)
Motor is defective or lead wire is broken	Renew an actuator
Control pack defective	Change control pack
Aperture unfixable (hunting)
Noise on signal line	Check input signal
Noise on potentiometer	Change potentiometer
Potentiometer and opening gear loose	Check the fixing screws
Aperture does not match input signal
A wrong signal input	Check the input signals
Improper adjustment of ZERO/SPAN	Re-adjust ZERO/SPAN
Potentiometer slipped	Re-adjust the aperture on the potentiometer
Aperture signal does not output
Signal wire is broken or connection is not proper	Check the wiring connection