G. VENT PLUG
Remove the 1/2" NPT steel pipe plug located nearest
the top of the gearbox and replace it with the plastic vent
plug provided with the operator (See Figure 16).
H. SETTING THE CLUTCH
(1) The purpose of the clutch is to protect the equipment
from shock loads that might be introduced into the
system. Under normal operation the clutch will not slip.
Therefore, the clutch should be adjusted to a suffi cient
torque that will allow the operator to start and stop the
door without any slipping. Keep in mind also that the
clutch should not be so tight that it cannot slip under
excessive loads.
(2) The magnetic clutch has an adjustable torque
output feature. The output is controlled by rotating the
electronic clutch controller located in the main control
panel. When the voltage is reduced the clutch torque
characteristics are de-rated. The clutch should be set
with just enough power to move the door. Turning off the
power to the operator will power off the clutch controller
and will allow the door to be operated manually. As an
additional option, a magnetic lock with battery backup
can be used to prevent manual operation of the door
during power failure.
I. SETTING RUN SPEED AND CREEP SPEED
Inside the operator control box locate the run speed
and creep speed potentiometers (Figure 4). The
potentiometers control the run and creep speeds of the
operator. Turning them clockwise increases the rate of
travel.
(a) Carefully turn the run speed potentiometer all the
way counterclockwise and then back clockwise
approx.
135
degrees.
(b) Carefully turn the creep speed potentiometer
all the way counterclockwise and then back
clockwise approx. 20 degrees.
(c) Release the drive chain latch and affi x it so that
it cannot reattach automatically. Note the location
of the long link, this is where the chain latch
attaches to the drive chain.
(d) Turn ON the power to the operator controller.
(e) Actuate a push button to run the operator.
The operator should travel the door in the
appropriate direction, slow down and creep into
approximately the full open or closed position.
(f) Reconnect chain latch to long link. Operate the
door open and closed.
(g) To increase or decrease the travel speed in
both run and creep speed adjust the appropriate
potentiometer clockwise to increase the speed
and counterclockwise to decrease the speed.
(h) Set the run and creep speeds to the desired
levels.
U.L. recognized snap-action
switches. Supplied as
SPDT, DPDT optional.
Rotary Cam Limit
Switch Assembly
SRLS51-( )-SP4
Plastic planetary gear
reduction stages. Sun gear
is input, ring gear is
stationary, planet carrier is
output. No lubrication.
17.5
29
75
Independent cam
adjusting screw with
self-locking adjustment.
Gear switching stages are
same as gear reduction
stages except cam is on
planet carrier. Sun gears
connected in parallel.
Primary gear stages yield
mulitiplier for
input/cam shaft ratio.
Figure 2.
Crown Industrial Operators • 213 Michelle Ct. • So. San Francisco, Ca 94080-6202
Phone: (650) 952-5150 • Fax: (650) 873-1495
www.crown-industrial.com Email: [email protected]
G-2001
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