80-4280-10, Rev. 4
23
CONTROL END / CPS-4 (BOTH VERSIONS SHOWN)
CONTROL END
The control end assembly is comprised of the
Contactless Position Sensor (CPS-4), limit switches,
and limit switch cams (see page 20 for location).
The assembly is installed on the control shaft
which is geared into the main output shaft of
the actuator. As the output shaft turns it moves
the control shaft , the limit switch cams, and the
Contactless Position Sensor ferrite core.
The control end includes two SPDT auxiliary
limit switches (labeled S1 and S2) for customer
connection and two over-travel limit switches
(labeled CW and CCW). The cams can be adjusted
to actuate the auxiliary switches anywhere in the
actuator’s range of travel.
CONTACTLESS POSITION SENSOR
(CPS-4), 2-Wire
The CPS-4 is a circuit board and sensor
assembly that is part of the control end assembly.
The CPS-4 provides the DCM-2 with a continuous
position signal proportional to the position of the
actuator’s output shaft. Two versions of the CPS-4
have shipped with Group 22 actuators (see below).
The position sensing function of the CPS-4 is
provided by a ferrite magnetic sensing element.
An electronic circuit translates the voltage from the
ferrite magnetic sensor into a position signal. The
position signal is used by the DCM-2 to determine
the actuator’s output shaft position for control
and to generate an analog 4-20 milliamp position
feedback signal for external use.
LOCAL PUSHBUTTON INTERFACE
The five pushbuttons located on the local
pushbutton interface are used for simple calibration
features. To utilize the pushbuttons, the user must
press and hold the calibrate button, then press and
hold the button for the desired function. Pressure
should be maintained until the “ACKNOWLEDGE”
LED lights; this confirms receipt of the pushbutton
command. See the calibration section of this
manual for further explanation of the calibration
procedures.
CAUTION
Pressing the following buttons may
change calibration and cause the
actuator to reposition.
CALIBRATE
As a safety feature, this button must be pressed
and held simultaneously with another pushbutton
to perform a calibration.
SET POS 100%
Calibrates the DCM-2 to recognize the current
output shaft position as the 100% position.
SET POS 0%
Calibrates the DCM-2 to recognize the current
output shaft position as the 0% position.
SET DEM 100%
Calibrates the DCM-2 to recognize the currently
applied Demand signal as the 100% Demand signal.
SET DEM 0%
Calibrates the DCM-2 to recognize the currently
applied Demand signal as the 0% Demand signal.
SWITCH
CAMS
Contactless Position Sensor
(CPS-4), 2-Wire
Pin
Connectors
Pin
Connectors
Limit Switches
(CW & CCW)
Limit
Switches
(CW & CCW)
Auxiliary
Switches
(S1 & S2)
Auxiliary
Switches
(S1 & S2)
Coupling
(Do Not Adjust
Inner Set Screws)
OR
