Sequence Of Operations 1130 - 1133 & 1160 - 1163 - Lincoln 1100 Series Service Manual

SEQUENCE OF OPERATIONS 1130 - 1133 & 1160 - 1163
POWER SUPPLY
CONTROL BOX AUTO COOL
DOWN
MAIN FAN CIRCUIT
HEATER CIRCUIT
TEMPERATURE CONTROL
CONVEYOR DRIVE
(S/N 2011383 and above
Models 1130 through 1133).
S/N 2011978 and above
Models 1160 through 1163
Refer to Page 26)
TIME/TEMP DISPLAY
6
MODEL 1130 / ELECTRIC / 120/208 VAC / 1 PHASE
MODEL 1131 / ELECTRIC / 120/240 VAC / 1 PHASE
MODEL 1132 / ELECTRIC / 120/208 VAC / 3 PHASE
MODEL 1133 / ELECTRIC / 120/240 VAC / 3 PHASE
MODEL 1160 / ELECTRIC / 120/208 VAC / 1 PHASE
MODEL 1161 / ELECTRIC / 120/240 VAC / 1 PHASE
MODEL 1162 / ELECTRIC / 120/208 VAC / 3 PHASE
MODEL 1163 / ELECTRIC / 120/240 VAC / 3 PHASE
Electrical Power to be supplied to the oven by a four conductor service on
single phase and a five conductor service on three phase.
Voltage from the black conductor to the white conductor is 120 VAC.
Black conductor is Hot.
Red conductor is Hot.
Orange conductor is Hot. (Used on 3Ø only)
White conductor is dedicated neutral.
Green conductor is ground.
NOTE: A 20 Amp Receptacle, NEMA STYLE L6-20, is provided on Models
1160, 1161, 1162, and 1163 for accessory plug in. Rated at 208 or 240 VAC.
When the temperature in the control box reaches 120°F 3° F(48.9° F
the Cooling Fan Thermostat will switch power to the Cooling Fans. The
thermostat will interrupt power to the fans when the temperature falls to 100° F
3° F(37° C 1.7° C).
Electrical power is permanently supplied through a 10 amp fuse to terminal 1 of
the 20 Minute Timer, through the normally closed Hi Limit Thermostat to the fan
switch. Closing fan switch energizes 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, these normally open contacts
now close supplying 208/240 VAC to the main fan motor. The cooling fans are
also energized. Closing the fan switch also supplies 120 VAC to the Heater
Switch/Conveyor Switch, and the display Transformer.
Closing the Heat Switch supplies 120 V AC through the normally open Air
Pressure Switch (closed by air pressure from the Main Fan), the 3 Amp Fuse, to
L1 terminal 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 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.
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 P3 (varying the DC voltage to the Conveyor Motor. The through 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.
The secondary output of the Transformer, is supplied to terminals 1, 2, and 3
of the Time/Temp. Display. The secondary output of Transformer 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 (S/N 2011383 and above on (cemented to tach. coupling) to
break the infra-red light beam Models 1130 through 1133 of the optical
encoder (mounted on gear motor), producing electrical pulses that are
Impinger II –1100 Series Service Manual - Domestic
1.7° C),