10
M7261,M7272,M7274,M7281,M7282,M7284,M7285,M7286,M7294
SETTINGS AND ADJUSTMENTS
Settings and Adjustments
ZERO AND SPAN ADJUSTMENT FOR M7284Q
AND M7285Q MOTORS (See Fig. 5.)
1. Adjust the start potentiometer fully clockwise
(maximum zero) and the span potentiometer fully
counterclockwise (minimum span).
2. Set the controller current to the value required to
drive the motor to the closed position.
3. Turn the start potentiometer slowly counterclock-
wise until the motor begins to open. This is defined as
the start or zero setting.
4. Set the controller current to the value required to drive
the motor to the fully open position. The motor will open.
5. Turn the span potentiometer clockwise until
the motor starts to close. The difference between the fully
open span position current and the zero position current is
defined as the operating span.
6. Recheck the start and readjust the span potentiometer
P1 if necessary. Turn the start potentiometer clockwise
to increase the zero position.
7. Recheck the span and readjust the span potentiom-
eter if necessary. Turn it clockwise to increase the
full span position.
8. For sequential operation, as shown in Fig. 9, repeat
the above steps for each motor.
Fig. 9—Sequential operation of motors.
20
(10)
16
(8)
12
(6)
8
(4)
4
(2)
0
CONTROL OUTPUT
mA CURRENT (OR VOLTS DC)
CLOSED
OPEN
CLOSED
OPEN
CLOSED OPEN
MOTOR 1 MOTOR 2 MOTOR 3
1 3 3 3
1
MOTOR 1 PROPORTIONS BETWEEN 4 AND 12 mA; FULLY
CLOSED AT 4 mA, FULLY OPENED AT 12 mA.
MOTOR 2 PROPORTIONS BETWEEN 8 AND 16 mA; FULLY
CLOSED AT 8 mA, FULLY OPENED AT 16 mA.
MOTOR 3 PROPORTIONS BETWEEN 12 AND 20 mA SIGNAL;
FULLY CLOSED AT 12 mA, FULLY OPENED AT 20 mA.
UP TO 6 MOTORS CAN BE DRIVEN SEQUENTIALY OR IN
UNISON FROM ONE CONTROLLER.
ADJUST ZERO ADJUST AND SPAN ADJUST POTENTIOMETERS
TO ACHIEVE DESIRED SEQUENCE.
2
3
SEQUENTIAL OPERATION
OF THREE M91XX MOTORS USING Q7230
M2893
AUXILIARY SWITCH SETTING PROCEDURE
(See Fig. 10)
CAUTION
1. Live circuits are exposed during the auxiliary
switch adjustment procedure. Always turn off
the power before adjusting switch cams.
2. Do not turn motor shaft by hand or with a
wrench because damage to the motor can result.
1. Remove the top cover from the wiring box to gain
access to motor terminals and auxiliary switch cams.
2. Disconnect the controller from the motor and con-
nect a current source to the positive (+) and negative (-)
terminals.
3. Increase or decrease the current to drive the motor to
the position where auxiliary equipment is to be switched.
4. For a switch differential of 1°, check the continuity of
auxiliary switch R-B contacts and rotate the cam as follows:
a. If contacts are open, rotate cam clockwise
until R-B contacts close.
b. If contacts are closed, rotate cam counterclock-
wise until R-B contacts open.
5. For switch differential of 10°, rotate cam approxi-
mately 180° so that the slow-rise portion of the cam actu-
ates the switch; then check continuity of auxiliary R-B
contacts and rotate cam as follows:
a. If contacts are open, rotate cam counterclockwise
until R-B contacts close.
b. If contacts are closed, rotate cam clockwise
until R-B contacts open.
c. Make final adjustment in the proper direction to
obtain contact make or break at desired position.
6. Check for proper differential and switching of aux-
iliary equipment by driving motor through full stroke in
both directions.
7. Disconnect power, remove current source, recon-
nect controller and replace the top cover on the motor
wiring box.
8. Restore power to the equipment.
NOTE: If differential is changed from 1° to 10°, the
switching action is reversed. Switch contacts R-B
make and R-W break on a counterclockwise (closed)
rotation.
!
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