25
D ELECTROMAGNETIC SENSOR
This safety device is housed on top of the Drive
Motor and detects - based on Hall Effect princi-
ple - the rotating speed and rotating direction of
the drive Motor.
Should the rotating speed drop below 1300
r.p.m. the magnitude measured by this device
is such to signal to the microprocessor to stop
the unit and light-up the YELLOW LED. The
same reaction occures when the drive motor
will tend to rotate in the wrong direction (coun-
terclockwise) or when it doesn't rotate at all.
NOTE. The machine will remain in OFF mode
for one hour then it will restart automatically.
In case the unit trips OFF again in alarm for 3
times in 3 hours, the machine SHUTS OFF
DEFINITIVELY. To restart the unit after the
shutoff caused by this safety device, it is
necessary first to eliminate the cause that has
generated the intervention of the device and
then switch OFF and ON the power line main
disconnect switch.
E OPTICAL ICE LEVEL CONTROL
(Two on SFN 1000)
The electronic optical ice level control, located
into the ice chute (one in each of the two ice
chutes on SFN1000 model), has the function to
stop the operation of the ice machine when the
light beam between the light source and the
receiver gets interrupted by the flake ice which
accumulates in the chute.
When the light beam is interrupted the Bin Full
YELLOW LED located in the front of the P.C.
BOARD blinks; in case the light beam gets
interrupted for as long as 6 seconds, the ice
machine stops (drive motor keeps on working
by 3' delay then stops) with the glowing-up of
the 2nd YELLOW LED to monitor the full ice bin
situation. The 6 seconds of delay prevents that
any minimum interruption of the light beam due
to the regular ice chuting through the ice spout
may stop the operation of the unit.
NOTE. During the life of the machine the Ice
Level Control may require a recalibration
mainly when the glass of the two optical eyes
are covered by a thin lay of scale.
To do it just follow the following procedure:
• With unit OFF push and old the Button of the
PC Board
• Give power to the machine through the
external Master Switch
• Hold the PC Board Button till the leds are
ON (more or less 10 seconds)
• Release the PC Board Reset Button
The Optical Ice Level Control is now recali-
brated.
Check for the correct operation of the Optical
Ice Level Control by plasing a handfull of ice
in between the two eyes.
The Bin Full yellow led must start to blink/flash
immediately and, 6 seconds later, the machi-
ne must trip OFF.
As soon as the ice is scooped out (with the
resumption of the light beam between the two
infrared sensor of ice level control) 6 seconds
later the ice machine resumes its operation with
the simul-taneous extinguishing the 2nd YEL-
LOW LED.
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