Emerson Fisher 3660, Instruction Manual

3660 and 3661 Positioners

Instruction Manual

Form 5265

March 2006

20

21B2335-D
A6012/IL

5.6V

5.6V

5.6V

60 Ohms

60 Ohms

4 - 20 mA

+

−

Figure 17. Equivalent Circuit

Refer to figures 17 and 18 when making electrical

connections. Use the 1/2-inch NPT (or M20 thread)

conduit connection for installation of field wiring. Run

the input wires through the conduit, and connect the

positive wire from the control device to the positioner

+ terminal and the negative wire from the control

device to the positioner 

−

 terminal. Do not over

tighten the terminal screws. The maximum torque is

0.45 N

S

m (4 lbf

S

in.).

Calibration

The following calibration procedures are for the

adjustment of the pneumatic positioner. For the Type

3661 positioner, there are no adjustments within the

converter portion of the positioner. All adjustments

are accomplished within the pneumatic portion of the

positioner.

WARNING

During calibration the valve may move.

To avoid personal injury and property

damage caused by the release of

pressure or process fluid, provide

some temporary means of control for

the process.

Refer to figure 24 (Type 3660) or figure 25 (Type

3661) for key number locations unless otherwise

indicated. Adjustment locations are shown in figure

19.

+

−

+

−

−

+

1

CONTROL

DEVICE

POSITIONER

HOUSING

TERMINAL

BLOCK

FIELD WIRING

EARTH

GROUND

NOTE: 

        FOR TROUBLESHOOTING OR MONITORING OPERATION,

AN INDICATING DEVICE CAN BE A VOLTMETER ACROSS 

A 250 OHM RESISTOR OR A CURRENT METER.

1

A3875*/IL

Figure 18. Typical Field-Wiring Diagram

1.  If mounting a new positioner on an actuator or if

the positioner action has not been changed, do not

perform steps 2 through 7.

2.  If the positioner action has been changed or if the

positioner has had maintenance performed on it,

complete steps 3 through 17.

3.  If the cover (key 21) has not been removed,

unscrew the two machine screws (key 24), and

remove the cover.

4.  Release all pressure from the positioner.

Disconnect the positioner output tubing to the

actuator. If the positioner is equipped with an output

gauge, plug the positioner output connection. If the

positioner is not equipped with an output gauge,

provide a gauge to monitor positioner output and

connect it to the positioner output connection.

5.  Set the supply pressure to the required setting.

Set the gain (proportional band) adjustment screw at

a nominal value by turning it clockwise until it stops,

and then turning it counterclockwise 1 turn.

Note

Adjusting the gain (PB) adjustment

changes the nozzle flapper

relationship. This nozzled flapper

change affect the actuator/positioner

response time.