Greenheck Fan 81, 41 Auxiliary Switches, Setting Stroke Fig, Auxiliary Switch Adjustment

SERIES 41 AND 81 MODUTROL IV™ MOTORS

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.

INNER STROKE	1
ADJUST CAM
OUTER STROKE	2
ADJUST CAM

	AUXILIARY
POWER END	SWITCH CAMS
OF MOTOR
	MOVE SCREWDRIVER AT
	TOP ONLY TO ADJUST CAM.

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.

2	BLUE LEAD	YELLOW LEAD	2	3
		1

1

RED LEAD 2

1USE 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.

2ON TWO-SWITCH MOTORS, SECOND SWITCH HAS BLACK LEADS WITH BLUE, YELLOW, AND RED TRACERS.

3SOME AUXILIARY SWITCH ASSEMBLIES INCLUDE ONLY RED AND YELLOW LEADS. SOME OTHERS DO NOT INCLUDE

THE YELLOW LEAD. M17099

Fig. 12. Auxiliary switch schematic.

1	TORQUE	NO. OF	CAM			WARNING
		CAMS	COLOR
				1/8 INCH		Fire or Explosion Hazard.
	HIGH	2	YELLOW
				STRAIGHT-BLADE
						Incorrect auxiliary switch wiring can allow the
				SCREWDRIVER
	LOW	1	BROWN	CAM		burner to come on at high fire causing severe
						injury or death.
2 OUTER STROKE ADJUST CAM IS ONLY						Check auxiliary switch wiring and cam adjustment
	PRESENT ON HIGH TORQUE MOTORS.				M17100
						before turning on the system.

Fig. 11. Stroke adjustments.	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°.

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