Mechanical Bin Control; [A] Proximity Switch; [B] Explanation Of Operation - Hoshizaki KM-280MAH Service Manual

3) Check the Controller Board by using test program of the Controller Board.
The Output Test Switch "S3" provides a relay sequence test. With power OFF, place S3 on
and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, and 4,
normal sequence every 5 seconds. S3 should remain in the "OFF" position for normal
operation.

3. MECHANICAL BIN CONTROL

(THESE INSTRUCTIONS NOT APPLICABLE TO MODELS WITH THERMOSTAT)

[a] PROXIMITY SWITCH

1) This machine uses a lever-actuated proximity switch (hereafter called "mechanical bin con-
trol") to control the ice level in the storage bin.

[b] EXPLANATION OF OPERATION

1) The startup and shutdown of the ice machine is controlled via the controller board. Dip
Switch number 7 must be in the ON position for the controller board to receive input from
the bin control.
(i) The controller board receives a resistance value input via the red K4 connector
from the bin control. A resistor wire harness is connected from the bin control to
the controller board.
(ii) When the bin control is activated in the bin full position (pushed to the right), a
15.8 KΩ signal will be sent to the control board to shut down the unit.
(iii) When the bin control is in the normal position (bin is not full), a 7.9 KΩ reading is
sent to the control board to continue operation.
2) During operation, the controller board will only shut down the machine if a 15.8 KΩ signal is
received from the bin control during the first 5 minutes of the freeze cycle.
(i) If ice pushes the lever to the right after the first five minutes of the freeze cycle,
the controller board will allow the machine to complete the freeze cycle and the
following harvest cycle before shutting down the machine. This will prevent
incomplete batches of ice from forming on the evaporator.
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