Lincoln 1100 Series service manual intervals to maintain desired temperature

	adjusted to desired temperature. The Thermocouple will provide varying
	millivolts to the Electronic Temperature Controller. The electronic tempera-
	ture controller supplies 120 VAC to the Solenoid Valve at intermittent
	intervals to maintain desired temperature.
CONVEYOR DRIVE	Closing the Conveyor Switch supplies 120 VAC to the
	D.C. Motor Control Board at terminals L1 and L2. AC volts are converted
	to DC volts and are supplied to the Conveyor Motor at terminals A+ and A-
	. Adjustment of the Speed Control
S/N 2011821 and above	Potentiometer (5,000 ohm, 10 turn) will change resistance at Refer to
Page B15	terminals P1, P2, and P3 varying the DC voltage to the Conveyor Motor.
	The speed of the conveyor motor will increase or decreaseas 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 Display Transformer, is supplied to terminals
	1, 2, and 3 of the Time/Temp. Display. The secondary output of Trans-
	former is nominally 12.5 to 15 VAC with a center tap. The voltage from
S/N 2011821 and above	center tap to each leg is 1/2 the secondary voltage.
Refer to Page B15	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
	minutes and seconds.
	The temperature portion of the Time/Temp 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.
AUTOMATIC COOL DOWN	When this oven is started, the time delay relay timing circuit is enabled,
	permitting the oven fan to run for approximately 20 minutes after the oven
	is shut off, to cool the oven. The Time Delay Relay will keep the coil of
	Main Fan Relay closed, maintaining operation of the Main Fan Motor and
	cooling fans.
CONVEYOR DRIVE	Closing the Conveyor Switch supplies 120 VAC, through a 3 Amp Fuse,
	to the primary of the Conveyor Control Transformer. The secondary of this
	Transformer supplies 10 VAC and 29 VAC to the Conveyor Control. The
	Conveyor Control supplies voltage pulses to the Conveyor Motor. The
	Conveyor Control Potentiometer varies the frequency of these pulses. The
	motor speed will increase or decrease, as the frequency of the pulses
	increase or decrease respectively.
TIME/TEMP DISPLAY	Closing the Main Fan Switch supplies 120 VAC to the primary
(STEPPER MOTOR DRIVE)	of the Time/Temp Transformer. The secondary output of the Trans
	former, 12.5 to 15 VAC with a center tap, is supplied to terminals 1, 2,
	and 3 of the Time/Temp Display. The Display works on a balanced input,
	and center tap voltage to each leg must be 1/2 the total reading.
	The speed side of the Time/Temp Display is supplied by the Conveyor
	Control, with the frequency of the pulses to the Conveyor Motor. This
	frequency is converted by the Time/Temp Display into a read out of
	minutes and seconds.

10 Impinger II - 1100 Series Service Manual - International