Calibration - Emerson Fisher 3660 Instruction Manual

3660 and 3661 Positioners
4 - 20 mA
+
5.6V 5.6V
−
21B2335-D
A6012/IL
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 NSm (4 lbfSin.).

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.
20
60 Ohms
5.6V
60 Ohms
TERMINAL
BLOCK
CONTROL
FIELD WIRING
+
DEVICE
−
−
1
NOTE:
1 FOR TROUBLESHOOTING OR MONITORING OPERATION,
AN INDICATING DEVICE CAN BE A VOLTMETER ACROSS
A 250 OHM RESISTOR OR A CURRENT METER.
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.
Adjusting the gain (PB) adjustment
changes the nozzle flapper
relationship. This nozzled flapper
change affect the actuator/positioner
response time.
Instruction Manual
Form 5265
March 2006
POSITIONER
HOUSING
+
+
−
EARTH
GROUND
Note