Sequence Of Operations 1134, 1135, 1136, 1150 - Lincoln Impinger Conveyor Ovens 1100 Series Service Manual

MODEL 1134
MODEL 1135
MODEL 1136
MODEL 1150
POWER SUPPLY
CONTROL BOX AUTO
COOL DOWN
MAIN FAN CIRCUIT
HEATING CIRCUIT
TEMPERATURE CONTROL
CONVEYOR DRIVE
S/N 2011383 and above
REFER TO PAGE B15
TIME/TEMP DISPLAY
Impinger II - 1100 Series Service Manual - International
SEQUENCE OF OPERATION 1134 - 1135 - 1136 - 1150
ELECTRIC
ELECTRIC
ELECTRIC
ELECTRIC
Electrical power to be supplied to the oven by a three conductor service on
single phase and a five conductor service on three phase.
When the temperature in the control box reaches
120°F ± 3°F (48.9°C ± 1.7°C), the Cooling Fan Thermostat closes,
switching power to the Cooling Fans. The thermostat will open at 100°F ±
3°F (37.8°C ± 1.7°C) interrupting power to the Cooling Fans.
Power is supplied by Line 1 on Model 1136 and L2 on 1134, 1135, and
1150 to the normally open main fan relay. Power is also supplied from Line
1, through the 1 Amp Fuse to the primary of the Step Down Transformer.
120 V AC is continuously supplied from Transformer secondary to terminal
number 1 of the 20 Minute Timer and through the High Limit Thermostat
(normally closed) to the Main Fan Switch. Closing the Fan Switch ener-
gizes the coil of the oven start relay, its contacts close enabling the 20
minute time delay module. The 20 minute time delay module supplies 120
VAC to the oven fan relay, this normally open contact now closes supply-
ing line voltage to the main fan motor. The cooling fans and the time/temp
display transformer are also energized.
Closing the Heat Switch supplies 120 volts AC through the normally open
Air Pressure Switch (closed by air pressure from the Main Fan), the 3
Amp Fuse, to terminal L1 of the Temperature Control Board, and the Heat
Indicator Light.
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.
Closing the Conveyor Switch supplies 120 VAC to the DC 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 Potentiometer (5,000 ohm, 10 turn)
will change resistance at terminals P1, P2, and P3varying 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 reducergear box and
the Tach. Generator. The tach. generatoris 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.
The secondary output of the Display Transformer, is supplied to terminals
1, 2, and 3 of the Time/Temp. Display.The secondary output of the Trans-
former is nominally 12.5 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
220/380 VAC 50 HZ
240/415 VAC 50 HZ
240 VAC 50 HZ
220/380 VAC 50 HZ
3 PHASE
3 PHASE
1 PHASE
3 PHASE
millivolts to the
5