IMPORTANT
Set cams by moving top of screwdriver only. Press- ing screwdriver against sides of cam slots could cause damage to motor end switches.
4.Insert l/8 in. screwdriver blade into slot on outer yellow cam and MOVE TOP OF SCREWDRIVER as far as possible clockwise n . Repeat in successive cam slots until outer cam is against clockwise q stop.
NOTE: Excessive force will damage cam stop on hub.
5.Check motor stroke before connecting linkage.
6.Disconnect 135 ohm pot, reconnect controller, re- place top cover on motor.
7.Attach linkage to motor.
SETTING 90” STROKE (Fig. 8):
1.Turn stroke pot fully counterclockwise 0 .
2.Drive motor to
3.Insert l/8 in. screwdriver into slot on inner yellow cam and MOVE TOP OF SCREWDRIVER as far as possible clockwise q (viewed from power end). Re- peat in successive cam slots until inner cam is against clockwise stop.
NOTE: Excessive force will damage cam stop on hub.
4.Insert l/8 in. screwdriver blade into slot on outer yellow cam and MOVE TOP OF SCREWDRIVER as far as possible counterclockwise c . Repeat in successive cam slots until outer cam is against counterclockwise stop.
NOTE: Excessive force will damage cam stop on hub.
5.Check motor stroke before connecting linkage.
6.Disconnect 135 ohm pot, reconnect controller, re- place top cover on motor.
7.Attach linkage to motor.
AUXILIARY SWITCHES
The auxiliary switches in M9484E,F motors are actu- ated by adjustable cams. The cams are mounted on the motor shaft at the power end of the motor. The settings of the cams determine the point in motor shaft rotation at which the auxiliary equipment will be switched on or off. These cams can be set to actuate switches at any angle within the stroke of the motor. Also each cam provides a fast rise portion for switching (1 o differential) and a slow rise portion for slow switching (10’ differential).
MODULATlNG SERIES 90 CIRCUIT
The potentiometers, one in the controller and one in the motor, along with resistor network, form a bridge circuit. As long as the value of the controlled medium remains at the controller set point, the circuit is balanced, and the motor does not run.
When the value of the controlled medium changes, the potentiometer wiper in the controller is moved, which unbalances the bridge circuit. This unbalance is amplified, and energizes Triac switching to run the motor in the direction necessary to correct the change in temperature or pressure. The motor turns the feedback potentiometer to rebalance the circuit and stop the motor.
Switching action and color coding are shown in Tables 1 and 2 on page 8.
Motors with factory added auxiliary switches are shipped in the closed position (counterclockwise fi , as viewed from power end) with auxiliary cams set to actuate switches 30” from the closed position, and to provide 1” differential. Wiih motor in closed (full counter- clockwise r\ ) position, auxiliary switch breaks
IMPORTANT
Do not turn motor shaft by hand or with a wrench as damage to the gear train and circuit board stroke limit contacts will result.
AUXIUARY SWlTCH SElllNG PROCEDURE (Fig. 9)
1.Removetopcoverfrom motorto gain access to motor terminals and cam adjustments.
2.Disconnect controller from motor and connect 135 ohm manual potentiometer with
3.Adjust 135 ohm pot so that motor shaft turns to position where auxiliary equipment is to be switched.
4.Insert a l/8 in.,
5.For switch differential of 1 O, check continuity of aux- iliary switch
a.lf contacts are open, rotate cam clockwise n until
b.lf contacts are closed, rotate cam counterclockwise c until
6.For switch differential of loo, check continuity of auxiliary switch
a.lf contacts are open, rotate cam counterclockwise 0 until
b.lf contacts are closed, rotate cam clockwise r\. until
c.Final adjustment in the proper direction should be made to obtain contact make or break at the desired position.
7.Check for proper differential and switching of auxil- iaryequipmentby runningmotorthroughfullstroke (inboth directions), using 135 ohm pot. Repeat adjustment if necessary.
8.Disconnect 135 ohm pot, reconnect controller, re- place top cover on motor.
NOTE: If differential is changed from 1” to lo”, the switch- ing action is reversed, thus: switch contacts
CONNECTION DIAGRAMS (Figs. 10-13)
These motors are designed for use in series 90 propor- tioning control circuits employing a 135 ohm series 90 controller. Series 90 high or low limit controls or manual minimum position potentiometers may also be used in the control circuit.
The M9484 can also be used with some electronic controllers which provide a
The standard series 90 controller has R, W, and B terminals. As the controller reduces Rto W resistance, the motor will drive closed (CCW as viewed from the power end).
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