5 … 9
4 … 9
MC • Karl Dungs
, Inc.
• EMP-5 • Edition 2017.05 • P/N 261483
Limit Switch
The counterclockwise limit switch is factory set to stop the
actuator after 90° of travel. This setting can be changed in the
field. To adjust the limit switch, removing the top metal cover,
and locate the small opening next to the terminal block and
positioned
between terminals 3 and 4 . Insert a flathead
screwdriver through this opening and turn the cam clockwise
as seen from the shaft end of the actuator to increase the
degree of actuator rotation up to a maximum of 320°. Each
click of the cam represents about 3° change in actuator ro-
tation. Attempting to adjust for more than 320° rotation will
result in both limit switches opening in the clockwise end of
the actuator rotation, and the unit will no longer operate. The
clockwise limit switch is fixed and cannot be field adjusted.
Auxiliary Switch
An adjustable cam operated SPDT switch is built into each
actuator. The switch is factory set to operate at the clockwise
end of the actuator rotation, making terminal 1 to terminal 6.
As the cam turns counterclockwise from this point, the cam
follower drops, breaking 1 to 6 and making 1 to 5. To adjust
the auxilary switch, removing the top metal cover, and locate
the small opening next to the terminal block and positioned
next to terminal 1. Insert a flathead screwdriver through this
opening and turning the disc clockwise as seen from shaft
end of the actuator causes the switch to operate nearer the
counterclockwise end of actuator rotation. Each click of the
cam represents about 3° change in operating point. NOTE:
After turning the disc, remove back plate and reposition the
wiper; it will need to be repositioned back to zero.
Speed Adjustment
Actuator timing is varied by a slotted adjustment screw on
the lower left side of the shaft (Models 424 & 454 only)
housing. Turning the screw clockwise decreases the speed.
If the adjustment screw is turned too far clockwise, the motor
will stall but will not be damaged. If stalling occurs, turn the
screw counterclockwise until the motor resumes operation.
Total adjustment is normally 3 - 1/2 turns.
CP-9302-702 (Black Box)
Adjustment (Preparation)
From
the factory, the actuator is calibrated such that it drives to 90
degrees with 20 mA applied and 0 degrees with 4 mA applied.
To reduce the 90 degree position or increase 0 degree posi-
tion, following the procedure below.
Initial Setup
1. Turn off all power and input signals to the actuator.
2. Remove the metal cover. This allows access to the poten-
tiometers and the input/deadband jumpers.
3. Disconnect the drive’s yellow and blue leads from the
controller.
4. Connect the drive’s leads to the corresponding lead on
an instrument capable of producing 4 - 20mA +/- 0.1 mA
(current calibrator).
Minimum Position Calibration
1. Apply power to the actuator, then turn on the “current cali-
brator”.
2. Adjust the “current calibrator” until the mA input equals the
desired zero point current. This is typically 4 mA.
See page 6 “Potentiometer Adjustment” for location of pots.
Adjustment
Hole for Auxiliary
Switch Adjustment
Hole for
Counterclockwise
Limit Adjustment
Shaft
Auxiliary
Switch
Disc
Counterclockwise
Limit Cam
Speed
Adjustment