Scotsman NSE654 Service Manual download pdf (Page 11)

ELECTRICAL SEQUENCE

There are 7 indicator lights on the control board:

WTR-OK. Water OK. Normal = Glowing. Glows

when there is water in the reservoir.

PWR-OK. Power OK. Normal = Glowing. Glows

when the control board has power and is

functional.

Service. Normally Off.

Freeze. Normally Glowing when making ice.

Bin Full. Normally Off when making ice.

LED1. Normally Glowing when making ice.

LED3. Normally Glowing when making ice.

If the machine is switched off at the mode switch,

but is otherwise ready to go, switching the mode

switch to ON does the following:

The PWR-OK light glows.

If there is water in the reservoir the WTR-OK

light glows.

After 10 seconds the Freeze, LED1 and LED3

lights glow and the machine starts up.

Start Up:

The compressor relay and auger motor relay

become energized, connecting power to the

windings of the auger motor and contactor coil.

The contactor is energized, connecting power to

the compressor, and the compressor starts.

During normal operation ice passes between

the ice level sensors but only interrupts their

infrared beam momentarily. The bin full light

remains off and the machine stays on until ice

builds up in the bin and blocks the path between

the sensors for 6 seconds or longer. When that

occurs the bin full light glows and the machine

shuts down.

Ice Vending

When the glass filler lever is pushed in the vend

switch closes connecting power to the ice chute

door solenoid and agitator drive motor.

Optional Portion Control: The portion control

module will power the agitator drive motor for a set

length of time. The amount of time is controlled by

the setting of the portion control knob,.

Holding the glass filler lever in will not cause

additional dispensing, unless the portion control is

set for continuous dispensing. Releasing and

re-pushing the glass filler lever will repeat the

dispense cycle.

Shut Down:

The compressor relay opens, LED1 goes out.

The compressor contactor opens

The compressor stops

The auger motor stays on for 1 more minute,

clearing out ice in the evaporator, and then

The auger motor relay opens, LED3 goes out

and the auger motor stops.

The compressor will not restart until 2 minutes or

more have passed after the last shut down.

If the path between the ice level sensors remains

clear for more than 10 seconds the ice machine

will restart.

Another purpose of the control board is to turn the

machine off when necessary:

When the water level in the reservoir falls below

the water level sensor’s tip, the WTR-OK light

goes out and the machine shuts down. When

water refills the reservoir the WTR-OK light

glows and the machine starts up again.

If the auger drive motor current becomes

excessive the compressor and auger drive

motor will be switched Off and the Service light

will blink. The control board will restart the auger

drive motor in 4 minutes. If during the first 60

seconds after restart the auger motor current

stays within limits, the compressor is restarted

and the machine returns to normal operation. If

the current is excessive within 60 seconds after

the restart, the process will be repeated once

more. If after that try the current is still

excessive the machine shuts down and must be

manually reset. The service light will then be

glowing continuously.

To Reset: Disconnect and reconnect electrical

power

Separate from the circuit board:

If the high pressure cut out switch opens the

machine will stop immediately. It will

automatically reset when the pressure falls

below its cut in point.

If the low pressure cut out switch opens the

machine will stop immediately. It will

automatically reset when the pressure rises

above its cut in point.

The mode switch is the manual control for the

complete machine, but it is not a service

disconnect.

NSE654

January 2000

Page 11

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Scotsman NSE654 Service Manual Page 11

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