Sequence Ofoperations 1104 Thru 1106 - Lincoln Impinger Conveyor Ovens 1100 Series Service Manual

MODEL 1104
MODEL 1105
MODEL 1106
POWER SUPPLY
MAIN FAN CIRCUIT
HEATER CIRCUIT
TEMPERATURE CONTROL
CONVEYOR DRIVE
TIME/TEMP DISPLAY
Impinger II - 1100 Series Service Manual - International
SEQUENCE OF OPERATIONS 1104 thru 1106
ELECTRIC
ELECTRIC
ELECTRIC
Electrical power to be supplied to the oven by a five conductor service on
Models 1104 and 1105 and a
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.
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.
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
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.
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
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
a constant conveyor speed.
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 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
380/220 VAC 50 HZ
415/240 VAC 50 HZ
240 VAC 50 HZ
three conductor service on the 1106.
3 PHASE
3 PHASE
1 PHASE
millivolts to the
the DC
reference for maintaining
tap. The voltage from center
3