Operation - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

ELECTRIC CONTROL FUNDAMENTALS
CONTROLLER
W
W
DRIVE
SHAFT
CLOSE
LIMIT
SWITCH
CCW
MOTOR
WINDING
(CLOSE)
T1
LINE VOLTAGE
Fig. 12. Series 60 Two-Position Control Circuit.
Low-voltage controllers cannot be used on line-voltage
control circuits. If the control circuit is low voltage, it can use
either a line-voltage controller or any low-voltage, spdt, or
floating controller.

OPERATION

Figure 12 illustrates the actuator in the closed position. On
a drop in temperature or pressure, the controller contacts close
R to B and open R to W (Fig. 13). The OPEN winding is
energized and the actuator shaft rotates cw until it reaches the
limit of travel and opens the OPEN limit switch (Fig. 14). The
actuator remains in this position until a rise in temperature or
pressure causes the controller contacts R to B to open and R to
W to close. The CLOSE coil is then energized and the actuator
shaft rotates ccw until it reaches the limit of travel and opens
the CLOSE limit switch.
NOTE: Most Honeywell Series 60 controllers close R to B on
a fall in the controlled variable and R to W on a rise.
R B
ACTUATOR
R B
CAM
OPEN
LIMIT
SWITCH
CW
WINDING
(OPEN)
T2
TRANSFORMER
C2513
CLOSE
LIMIT
SWITCH
CCW
WINDING
(CLOSE)
Fig. 13. Series 60 Initial Control Action on
a Temperature (or Pressure) Drop.
CLOSE
LIMIT
SWITCH
CCW
WINDING
(CLOSE)
Fig. 14. Series 60 Final Control Action
at End of Open Stroke.
ENGINEERING MANUAL OF AUTOMATIC CONTROL
104
CONTROLLER
W R B
ACTUATOR
W R B
DRIVE
CAM
SHAFT
OPEN
LIMIT
SWITCH
CW
WINDING
MOTOR
(OPEN)
T1 T2
TRANSFORMER
LINE VOLTAGE
C2514
CONTROLLER
B
W R
ACTUATOR
W R B
DRIVE
SHAFT
CAM
OPEN
LIMIT
SWITCH
CW
MOTOR
WINDING
(OPEN)
T1 T2
TRANSFORMER
LINE VOLTAGE
C2515