Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur télécharger pdf (Page 7)

Impinger I -–1000 Series Service Manual - International

14 VAC) with a center tap, and supplies power to the Time/Temp Display. The

voltage from each leg of the Transformer's secondary to the center tap should be

one half of the secondary voltage

BURNER CIRCUIT Closing the normally open Burner Switch supplies 220 VAC, through the gas

pressure-proving switch, and through the Main Fan Air Pressure Switch, to the

Ignition Control. The combustion motor relay is energized, its normally open contacts

now close, supplying120 VAC to the combustion motor. The normally open

combustion air switch closes upon sensing air. After pre-purge period of between 30

and 60 seconds, the Ignition Transformer is energized and the Main Gas Valve is

energized. Ignition should now occur.

TEMPERATURE

CONTROL

Closing the Fan Switch supplies (through the Step down Transformer) 120 VAC to

the Temperature Control Board. The 2.5K ohm Temperature Potentiometer is

adjusted to desired temperature. The Thermocouple will provide varying millivolts to

the Temperature Controller. The Temperature Controller supplies 120 VAC to the

Solenoid Valve at intermittent intervals to maintain desired temperature.

CONVEYOR DRIVE

(S/N4390-Q17170)

(Conveyor Drive

Q171701 & Above See

Page 9)

Closing the fan switch and the normally open conveyor switch supplies 120 VAC to

the Motor Control Board. AC volts are converted to DC volts and are supplied to the

Conveyor Motor at terminals A+ and A-. Adjustment of the Speed Control

Potentiometer (5,000 ohm 10 turn) will change resistance at terminals P1, P2, and

P3 varying the DC voltage to the Conveyor Motor. The speed of the conveyor motor

will increase or decrease as the DC voltage from the board increases or decreases

respectively. As the motor turns, it drives both the reducer gearbox and the tach.

generator. The tach. generator is a DC voltage generator which supplies a voltage to

the DC motor control board and is used as a reference for maintaining a constant

conveyor speed.

(Time/Temp Display

Q17171 & Above See

Page 9)

The Time/Temp. Display is energized when the Fan Switch is closed, supplying 120

VAC to the primary of the 12.6 volt Transformer. The secondary output of the

transformer, normally 13 to 14 VAC (depending on input), with a center tap, is

supplied to terminals 1,2, and 3 of the Time/Temp. Display. The center tap is

terminal 2. The display works on a balanced input and center tap voltage to each leg

must be 1/2 the total reading.

TIME/TEMP

DISPLAY(Q17171 &

Above See Page 9

The speed side of the Time Temp. Display uses a slotted disc (cemented to tach.

coupling) to break the infra-red light beam of the optical switch (mounted on gear

motor) producing electrical pulses that are transmitted to the display. The display

converts these pulses into a read-out of minutes and seconds.

The temperature portion of the display uses a Thermistor Probe to sense oven

temperature. The thermistor outputs a resistance proportional to the oven

temperature. This resistance is then converted by the display into a temperature

reading.

SEQUENCE OF OPERTIONS 1032

MODEL 1032 - 380Y/220 VAC - 50 HZ - 3 PHASE

POWER SUPPLY Electrical Power to be supplied to the Oven by a five conductor service

Black conductor is Hot

Red conductor is Hot

Orange conductor is Hot

White conductor is Dedicated Neutral

Green conductor is Ground

MAIN FAN CIRCUIT Electrical power is permanently supplied through 3, 50A fuses to the normally open

contacts of the Mercury Contactor. Power is also supplied through one 10A fuse to

the normally open contact of the Main Fan Relay, through a 1A Fuse to the normally

open Double Pole Main Fan Switch, and to the normally open Cool-Down

Thermostat (thermostat closes at 160°F and opens at 140°F.) Closing the Main Fan

Switch supplies 220VAC to the primary of the control circuit Step Down Transformer.

(The transformer steps the voltage down to 120 VAC for the control circuit.) 120 VAC

is supplied to the coil of the Main Fan Relay. The coil of the relay is energized, the

normally open contacts close, energizing the Main Fan Motor. Closing the Main Fan

Switch also supplies power to the 12.6 VAC Transformer, the Control Box Cooling

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Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur Page 7

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