Greenheck Fan Modutrol IV Motors 81 - Manual (Page 8)

SERIES 41 AND 81 MODUTROL IV™ MOTORS
63-2187—3 8
Setting Stroke (Fig. 11)
CAUTION
Motor Damage Hazard.
Pressing screwdriver against sides of cam slots or
use of excessive force can damage the cams.
Set cams by moving top of screwdriver only.
1. Drive the motor to its fully open position by applying
24 Vac across terminals T1 and T2.
2. Insert 1/8 in. screwdriver blade into brown cam slot and
move top of screwdriver handle clockwise, to the right,
(allowing motor to reposition after each adjustment) until
motor reaches desired position.
NOTE: Each cam click is approximately a 2° rotation.
3. If motor turns beyond desired position, do not move
the cam:
a. Allow the motor to spring return fully closed by
disconnecting power.
b. Move the cam back to the left (counterclockwise).
c. Repeat steps 1, 2 and 3.
4. Replace the motor cover.
Fig. 11. Stroke adjustments.
Auxiliary Switches
The auxiliary switches are spdt switches that are actuated by
adjustable cams. The cams are factory-mounted on the motor
shaft at the power end of the motor. The cam settings
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 the switches at any angle within the
motor stroke.
NOTE: For auxiliary switch wiring, see Fig. 12.
With a 1° differential, the N.C. switch contacts make and the
N.O. switch contacts break on a counterclockwise (closed)
rotation. If a 10° differential is chosen, the operation is
reversed, the N.O. switch contacts make and the N.C. switch
contacts open on a counterclockwise (closed) rotation.
NOTE: When the slow-rise portion of the cam is used, the
switching differential is approximately 10° of rotation.
When the fast-rise portion of the cam is used, the
switching differential is approximately 1° of rotation.
Do not use the fast rise portion of the cam if fast
cycling of auxiliary equipment is undesirable.
Switching action is different depending on whether 1° or 10°
differential is chosen. See Table 3.
Fig. 12. Auxiliary switch schematic.
WARNING
Fire or Explosion Hazard.
Incorrect auxiliary switch wiring can allow the
burner to come on at high fire causing severe
injury or death.
Check auxiliary switch wiring and cam adjustment
before turning on the system.
Watch controlled equipment through a complete cycle.
Shut the system down immediately if switches do not
sequence the equipment correctly.
Auxiliary Switch Adjustment
Adjustable cams actuate the auxiliary switches. These cams
can be set to actuate the switches at any angle within the
stroke of the motor. Select switch differential of 1° or 10°.
OUTER STROKE
ADJUST CAM
OUTER STROKE ADJUST CAM IS ONLY
PRESENT ON HIGH TORQUE MOTORS.
M17100
POWER END
OF MOTOR
INNER STROKE
ADJUST CAM
AUXILIARY
SWITCH CAMS
MOVE SCREWDRIVER AT
TOP ONLY TO ADJUST CAM.
1/8 INCH
STRAIGHT-BLADE
SCREWDRIVER
CAM
1
2
1
2
TORQUE
NO. OF
CAMS
CAM
COLOR
HIGH
LOW
2
1
YELLOW
BROWN
BLUE LEAD YELLOW LEAD
RED LEAD
USE NEC CLASS 1 WIRING UNLESS POWER SUPPLY
MEETS CLASS 2 REQUIREMENTS. TAPE UNUSED LEADS.
ENSURE THE CURRENT DRAW OF THE EXTERNAL CIRCUIT
IS LESS THAN SWITCH CONTACT RATING.
ON TWO-SWITCH MOTORS, SECOND SWITCH HAS BLACK
LEADS WITH BLUE, YELLOW, AND RED TRACERS.
SOME AUXILIARY SWITCH ASSEMBLIES INCLUDE ONLY
RED AND YELLOW LEADS. SOME OTHERS DO NOT INCLUDE
THE YELLOW LEAD.
M17099
1
1
1
2
2
2 2
3
3