Lincoln 1100 Series service manual SEQUENCE OF OPERATIONS 1104 thru

SEQUENCE OF OPERATIONS 1104 thru 1106

MODEL 1104	ELECTRIC	380/220 VAC	50 HZ	3 PHASE
MODEL 1105	ELECTRIC	415/240 VAC	50 HZ	3 PHASE
MODEL 1106	ELECTRIC	240 VAC	50 HZ	1 PHASE

POWER SUPPLY	Electrical power to be supplied to the oven by a five conductor service on
	Models 1104 and 1105 and a three conductor service on the 1106.
MAIN FAN CIRCUIT	Power is permanently supplied (through a 10A fuse) to the normally open
	contact of the main fan relay, the normally open cool-down thermostat and
	to the normally open main fan switch. Closing the main fan switch supplies
	line voltage to the primary of the power 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, its normally open contacts now close,
	energizing the main fan motor. Closing the main fan switch also supplies
	120 VAC to the cooling fan and, through a normally closed hi-limit thermo-
	stat, the time/temp display, heat and conveyor switches.
HEATER CIRCUIT	Closing the Heater Switch provides power through the normally open Air
	Pressure Switch through the 3 Amp Fuse, to the Temperature Control
	Board and to the Heater Lamp.
TEMPERATURE CONTROL	Closing the Heat Switch supplies 120 VAC to the Electronic Temperature
	Control. The 2.5K ohm Potentiometer is adjusted to achieve the desired
	temperature. The Thermocouple will provide varying		millivolts to the
	Temperature Control. The temperature control board then supplies 120
	VAC to the coil of the Contactor at intermittent intervals to maintain the
	desired temperature.
	NOTE: Units with Serial Number prior to 2000782 were equipped with a
	Fenwall Temperature Control and used a Temperature Control Potentiom-
	eter rated at 5K ohms.
CONVEYOR DRIVE	Closing the Conveyor Switch supplies 120 VAC to the DC Motor Control
	Board at terminals L1 and L2. A.C.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 gear box 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	The secondary output of the Transformer, is supplied to terminals 1, 2,
	and 3 of the Time/Temp. Display. The secondary output of the Transformer
	is nominally 12. to 15 VAC with a center	tap. The voltage from center
	tap to each leg is 1/2 the secondary voltage
	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 encoder
	(mounted on gear motor) producing electrical pulses that are transmitted
	to the display. The display converts these pulses into a read-out of min
	The temperature portion of the Time/Temp Display uses a Thermistor

Impinger II - 1100 Series Service Manual - International 3