Dwyer ABFV User Manual download pdf (Page 3)

Page 3

XI. TROUBLESHOOTING

SYMPTOM

Actuator does not

respond to control

signal

Actuator will not

open and/or close

completely

Valve oscillates

Actuator motor

runs but output

shaft does not

rotate

SOLUTION

•Turn on Power

•Check wiring diagram;

re-wire

•Bring correct supply

to actuator

•Allow motor to cool;

resets automatically

•Remove actuator;

remount after 90° turn

•Set cams per

instructions

•Install correct unit

•Remove stops

•Torque of valve too

high

•Install brake

•Adjust brake; tighten

screw

•Contact factory

PROBLEM

•Power is not on

•Actuator wired incorrectly

•Incorrect voltage

•Thermal Overload

•Actuator and Valve in

opposite positions when

actuator installed

•Travel limit switch set

incorrectly

•Valve torque too high

•Mechanical stops not

removed when installing

actuator

•Torque of valve too high

•Actuator without brake

installed on butterfly valve

•Motor brake misadjusted

•Gear damaged/sheared

I. BASIC INSTALLATION

1. Operate valve manually and place in the open position. (NOTE: ALL

ELECTRIC ACTUATORS ARE SHIPPED IN THE OPEN POSITION.)

2. Remove any mechanical stops the valve might have. (DO NOT

REMOVE ANY PARTS NECESSARY FOR THE PROPER OPERATION

OF THE VALVE, SUCH AS THE PACKING GLAND, PACKING NUT,

ETC.)

3. Ensure that the actuator output shaft and valve stem are aligned

properly. If they are not, operate the valve manually until they are

correct.

4. Mount actuator to valve. Do not tighten nuts and bolts at this time.

5. Remove actuator cover.

6. Bring power to the actuator. CAUTION: Make sure power is OFF at

the main box.

7. Wire the actuator per the diagram attached to the inside of the

cover. Special actuators (those with positioner boards, etc.) will have

diagrams enclosed inside the cover.

8. Securely tighten bolts used to mount the actuator to a mounting

bracket or directly to the valve mounting pad if it is ISO5211 compliant.

9. Cycle the unit several times and check the open and closed

positions of the valve. Cams are pre-adjusted at the factory; due to the

variety of valve designs and types, however, slight adjustments might

be required. (SEE II and III).

10. Replace cover and tighten screws.

II. TO SET THE OPEN POSITION

1. Cycle the valve to the open position by applying power to terminals

#1 and #2. The top cam and switch control this position. In the open

position, the set screw in the top cam will be accessible.

2. If the valve is not open completely:

A. Slightly loosen the 8-32 x 1/4” set screw on the top cam.

B. Rotate the cam clockwise (CW) by hand until the switch

makes contact. Contact is made when a slight click can be

heard. By making incremental CW movements of the top

cam, the valve can be positioned precisely in the desired

position.

C. When the top cam is set, tighten the set screw securely.

3. If the valve opens too far:

A. Apply power to terminals #1 and #3. This will begin to

rotate valve CW. When valve is fully open and in the exact

position desired, remove power from actuator.

B. Loosen the set screw in the top cam.

C. Rotate the top cam counterclockwise (CCW) until the

switch arm drops off the round portion of the cam onto the

flat section. A slight click can be heard as the switch

changes state.

D. Continue applying power to terminals #1 and #3 until

valve is in the desired position.

III. TO SET THE CLOSED POSITION

1. Apply power to terminals #1 and #3 to move the valve toward the

closed position. The bottom cam and switch control the closed

position. In the closed position, the set screw in the bottom cam will

be accessible.

2. If the valve is not closed completely:

A. Slightly loosen the 8-32 x 1/4” set screw on the bottom

cam.

B. Rotate the cam counter-clockwise (CCW) by hand until

the switch makes contact. Contact is made when a slight

click can be heard. By making incremental CCW move-

ments of the bottom cam, the valve can be positioned pre-

cisely in the desired position.

C. When the top cam is set, tighten the set screw securely.

3. If the valve closes too far:

A. Apply power to terminals #1 and #2. This will begin to

rotate valve CCW. When valve is fully closed and in the exact

position desired, remove power from actuator.

B. Loosen the set screw in the top cam.

C. Rotate the top cam clockwise (CW) until the switch arm

drops off the round portion of the cam onto the flat section.

A slight click can be heard as the switch is no longer mak-

ing contact with the round part of the cam.

D. Continue applying power to terminals #1 and #2 until

valve is in the desired position.

IV. MAINTENANCE

Once the actuator has been properly installed, it requires no

maintenance. The gear train has been permanently lubricated and in

most cases will never be disturbed. In the event it becomes necessary

to open the gear box for any reason, however, Shell Darina

#2 grease

is recommended for re-lubricating.

ELECTRIC ACTUATOR

V. DUTY CYCLE

Most standard electric actuators are rated for 25% duty cycle at 100%

ambient temperature at the rated torque.

VI. THERMAL OVERLOAD

All actuators are equipped with thermal overload protection to guard

the motor against damage due to overheating.

VII. MECHANICAL OVERLOAD

All actuators are designed to withstand stall conditions. It is not

recommended to subject the unit to repeated stall conditions.

VIII. SPARE PARTS

When ordering parts, please specify:

A. Model # B. Serial # C. Part Description

Recommended spare parts include:

A. Standard actuator: set of cams and switches.

B. Actuators w/positioner: set of cams and switches; 1K

potentiometer; valve positioner board.

IX. NEMA 7 ELECTRIC ACTUATORS

In general, operation and maintenance of a NEMA 7 electric actuator

is no different than that of a NEMA 4 actuator. However, some

precautions must be followed:

1. DO NOT under any circumstances remove the cover of the actuator

while in a hazardous location. Removal of the cover while in a

hazardous location could cause ignition of hazardous atmospheres.

2. DO NOT under any circumstances use a NEMA 7 electric actuator

in a hazardous location that does not meet the specifications for which

the actuator was designed.

3. Always mount and cycle test the actuator on the valve in a non-

hazardous location.

4. When removing the cover, care must be taken not to scratch, scar

of deform the flame path of the cover and base of the actuator, since

this will negate the NEMA rating of the enclosure.

5. When replacing the cover on actuators rated for both NEMA 4 & 7,

take care that the gasket is in place to assure proper clearance after

the cover is secured. After the cover screws are tightened, the

clearance between the cover and the base should be checked. A

.002” thick by 1/2” wide feeler gauge is used for this; it must not enter

between the two mating faces more than .125".

6. All electrical connections must be in accordance with the

specifications for which the unit is being used.

7. Should the unit ever require maintenance, remove from the

hazardous location before attempting to work on the unit.

If the actuator is in a critical application, it is advisable to have a

standby unit in stock.

Darina

is a registered trademark of Shell Oil Company

V-28 12/18/06 10:03 AM Page 3

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Dwyer ABFV User Manual Page 3

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