17
80-0042-00, Rev. 06.9
3. Set the Forward/Reverse toggle switch to STOP
(center position), Option 7 Control Board only.
4. Set the Manual/Automatic toggle switch to "M"
(Manual), Option 7 Control Board only.
5. Connect the meter to read the feedback signal.
FOR CURRENT FEEDBACK APPLICATIONS:
Connect the meter in series with the plus signal
line of the control room indicator and the plus
signal position (terminal 14 or 15; see TABLE 1
for correct meter polarity or reference the wiring
diagram inside the control cover).
FOR VOLTAGE FEEDBACK APPLICATIONS:
Connect the meter across the signal terminals 13
and 14. Terminal 14 is positive.
FOR INSTALLATIONS WITH NO REMOTE
INDICATOR:
Remove the resistor from between
terminals 13 and 14 and connect the meter across
these terminals. Terminal 14 is positive.
6.
Reverse plug connection P4. Note that plug
P4 is a locking type plug and must be located
properly in its receptacle. The tapered side of
the plug must be against the tapered side of
the receptacle. See Figure 6, page 18 for the
location of the plug. NOTE: On plug P4, CW =
Extend and CCW = Retract.
7. If the mechanical position of the feedback
potentiometer has not been set:
a. Move the actuator output shaft to the
(minimum input signal) position.
b. Disconnect all power to the drive.
c. Loosen feedback potentiometer clamp
screws.
8. Turn trim potentiometer R38 clockwise 20
turns (to limit), then rotate it 8 full turns
counterclockwise.
9. Turn trim potentiometer R46 clockwise 20
turns (to limit), then rotate it 8 full turns
counterclockwise.
10. Reconnect actuator power.
11. Turn the feedback potentiometer until the
output signal reads 20 + 0.5 milliamps (5 + 0.1
volts on units configured for voltage output).
12. Tighten the feedback potentiometer clamp
screws to hold the potentiometer in position.
The potentiometer orientation is now
complete.
Signal Calibration
13. Turn trim potentiometer R46 counterclockwise
until the output signal reads 3.95 mA ± .001
mA (1 volt on units configured for voltage
output).
14. Move the output shaft towards the (maximum
input signal) position.
with a 249 ohm resistor. To convert a 1-5 volt
configuration to 4-20 milliamps, remove the 249
ohm resistor and replace it with a 12 volt zener
diode, Beck Part Number 13-2550-04. See
Figure 5, page 16, for location of resistor R2.
FOR OPTION 5: To convert a 4-20 milliamp
configuration to 1-5 volts, install a 249 ohm
resistor in position R2. To convert a 1-5 volt
configuration to 4-20 milliamps, remove the 249
ohm resistor from position R2.
FEEDBACK POTENTIOMETER AND
SIGNAL CALIBRATION PROCEDURE
When properly adjusted, the feedback signal
will be 20 milliamps (5 volts) with the actuator output
shaft in the 100% (maximum input signal) position.
At the 50% travel position, the signal should be
12 milliamps (3 volts) and at 0% (minimum input
signal) 4 milliamps (1 volt). NOTE: The endpoint
values are opposite if the direction of travel is set to
retract on an increasing signal.
The calibration procedure requires checking
and/or setting the feedback potentiometer and
two trim potentiometers located on the control
board. The following paragraphs describe the
procedure to check and set feedback signal
calibration.
NOTE: The travel limit switches must be
properly adjusted before the feedback signal
is calibrated. The feedback signal must be
calibrated before the input signal can be
calibrated.
Tools required for calibration:
mA/V dc voltmeter
3/32 inch screwdriver
Large screwdriver
TABLE 1 lists the meter connections required
for the calibration procedure.
Figures 6 and 7 show the location of the
jumper plug, feedback potentiometer, trim
potentiometers, the Forward/Reverse and
Manual/Automatic switches and plug P4 on the
control boards.
Orienting the Potentiometer
(Note: Only use Steps 2–12 when changing
direction of travel)
1. Remove the control module cover.
2. Position the actuator output shaft to the end of
travel that corresponds to 4 mA (i.e., to the fully
retracted position if the actuator travel is set to
extend on an increasing demand signal, or to
the fully extended position if the actuator travel
is set to retract). Allow the over-travel limit
switch to de-energize the motor at the limit.
Continued
