Scotsman MDT6N90 Wartungshandbuch PDF herunterladen (Seite 11)

ELECTRICAL SEQUENCE

Refer the wiring diagram as needed.

The “Power” light on the board glows whenever

there is power to the machine (and the master

switch is ON).

If the machine is switched off at the master switch,

but is otherwise ready to go, switching the master

switch to ON does the following:

The bin empty and power lights on the circuit

board glow.

There is a 15 second delay

If there is enough water in the reservoir, the

circuit board will allow the machine to start up.

Start up consists of:

The compressor contactor coil receives power

from the circuit board.

The contactor is energized, connecting power to

the compressor, and the compressor starts.

The auger motor receives power from the circuit

board and starts.

As ice goes past the ice level sensors, the bin

empty light will stay on and the machine will

continue to run, unless the ice stays between

the sensors for more than 15 seconds (bin full).

At that point, the bin empty light goes out, and

the machine shuts down.

Other reasons for shut down:

Low water level (as sensed by the thermistor in

the reservoir).

Shut Down consists of:

The compressor contactor opens

The compressor stops

The auger motor is run by the circuit board for 2

more minutes, clearing out ice in the evaporator,

and then

The auger motor no longer receives power from

the circuit board, and the auger motor stops.

After a 6 minute delay, If the ice level sensor is

clear (bin empty) for more than 15 seconds, the

machine will start up again.

Another purpose of the circuit board is to turn the

machine off if there is not enough water in the

machine.

When the water level in the reservoir falls

below the tip of the water level sensor, the

machine will “shut down”

After a 6 minute delay, if the water refills the

reservoir, the machine will start up again.

Separate from the circuit board:

If the high pressure control (cut out switch)

opens, the compressor will stop immediately

(through the contactor). It will automatically

reset when the discharge pressure drops below

350 PSIG.

The master switch is the manual control for the

complete machine, but it is not a service

disconnect.

Ice Vending

When a user places a container in front of the

Touch Free ice sensor and below the ice

delivery chute, the circuit board connects power

to the bin drive motor and ice is dispensed for

as long as the container is present. If the user

does not remove the container, ice will be

dispensed for 60 seconds and then stop.

MDT6N90

May 2001

Page 11

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