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SERIES 41 AND 81 MODUTROL IV™ MOTORS
SETTINGS AND ADJUSTMENTS
Before Setting Stroke
1.
Remove the top cover from the motor.
2.
Disconnect the controller from the motor.
3.
For models with an internal transform er (line voltage
motors), ensure that power (and nothing else) remains
connected to the motor.
IMPORTANT
Detach linkage from m otor before adjusting stroke.
Adjustable Stroke
When viewing from the power end of the motor, the stroke
potentiom eter is to the far left. To set the stroke to 160°
(maximum position) turn the potentiom eter fully clockwise
, using a 1/8 in. straight-blade screwdriver. To set the
stroke at 90° (minimum position) turn the potentiometer fully
counter-clockwise
. Setting the potentiometer anywhere
between fully clockwise and fully counter-clockwise will set the
stroke between 160° and 90°.
Fig. 11. Stroke adjustments.
!л CAUTION
Careless Installation Hazard.
Use o f excessive force while adjusting cams
damages the motor.
To avoid damaging motor end switches, set cams by
moving only the screwdriver top.
!X CAUTION
Equipm ent Damage Hazard.
Can dam age the motor beyond repair.
Never turn the motor shaft by hand or with a wrench.
Forcibly turning the motor shaft damages the gear train
and stroke limit contacts.
6 3
2 6 2 7 — 01
-
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:
Series 2 Motors are shipped with auxiliary switch
cams that permit acceptance of 220736A,B Internal
Auxiliary Switch Kits. Refer to Form no. 63-2228 for
220736A,B Installation Instructions.
For auxiliary switch wiring, see Fig. 12.
W ith 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.
W hen 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 w hether 1° or 10°
differential is chosen. See Table 4.
A
B LU E LEAD
A 1
1 \U S E N E C C L A S S 1 W IR IN G U N L E S S P O W E R S U P P LY
M E E TS C L A S S 2 R E Q U IR E M E N T S . TA PE U N U S E D LEA D S .
E N S U R E TH E C U R R E N T D R A W O F TH E E X T E R N A L C IR C U IT
IS LESS TH A N S W IT C H C O N T A C T R A TIN G .
A
/ 2 \ O N T W O -S W IT C H M O T O R S , S E C O N D S W ITC H H AS B LA C K
c
L EA D S W IT H B LU E , Y E L L O W , A N D R E D TR A C E R S .
L
A
s
/ 3 \ S O M E A U X IL IA R Y S W ITC H A S S E M B L IE S IN C LU D E O N LY
RED A N D Y E L L O W LEA D S . S O M E O TH E R S DO N O T IN C LU D E
TH E Y E L L O W LEA D.
Fig. 12. Auxiliary switch schematic.
A
w a rn in g
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 equipm ent through a complete cycle.
Shut the system down immediately if switches do not
sequence the equipment correctly.
8
A A
Y E L L O W LEAD
A
RED LEAD
M17099
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