Lincoln 1400 Series service manual Heat Circuit Temperature Control Conveyor Drive

Page 4

HEAT CIRCUIT

TEMPERATURE CONTROL

CONVEYOR DRIVE

energized, the normally open contacts close, energizing the main fan motor and cooling fan. Closing the main fan switch also supplies power to the conveyor control and the centrifugal switch of the main fan motor.

Closing the on/off switch supplies 120 VAC to the normally open centrifugal switch (inside the main fan motor). As the motor reaches approximately (900 RPM) the centrifugal switch closes supplying 120 VAC through the normally closed oven cavity and control box hi-limit thermostats, to the electronic temperature control board

When the centrifugal switch (inside the main fan motor) closes, 120 VAC is applied to the temperature controller. The temperature dial is adjusted to the desired temperature. The thermocouple will provide varying millivolts to the temperature controller. The temperature controller supplies 120 VAC to the contactor coils at intermittent intervals (closing the contactors and supplying 208 or 240 VAC to the heating elements) to maintain desired temperature. The ready lamp is energized with the contactors.

Closing the on/off switch supplies 120 VAC to the motor control board. 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 will change resistance at terminals P1 & P2 varying the DC voltage to the motor. The speed of the conveyor motor will increase or decrease as the DC voltage from the board increases or decreases respectively.

NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor that senses the motor speed. Any change in motor load (± RPM) is detected by the sensor and the voltage to the motor is adjusted accordingly.

POWER SUPPLY

CONTROL BOX AUTO COOL DOWN

MAIN FAN CIRCUIT

HEAT CIRCUIT

TEMPERATURE

CONTROL

CONVEYOR DRIVE

4

SEQUENCE OF OPERATIONS

MODEL 1454 / 380/220 VAC / 50 HZ / 3 PHASE

MODEL 1455 / 415/240 VAC / 50 HZ / 3 PHASE

Electrical power is to be supplied to the oven by a 5-conductor service. Black conductor is hot.

Red conductor is hot. Orange conductor is hot.

White conductor is dedicated neutral. Green conductor is ground

When the temperature in the control box reaches 120°F ± 3°, (49°C ± 1.7°C), the cooling fan thermostat will switch power to the cooling fan. The thermostat will interrupt power to the cooling fan when the temperature falls to 100°F ± 3° (37°C ± 1.7°C).

Electrical power is permanently supplied through three 50A fuses to the normally open contacts of the mercury contactor. Power is also supplied through 1, 10A fuse to the normally open contacts of the main fan relay, to the normally open cooling fan thermostat, through a 3A fuse to the normally open single pole main fan switch. Closing the main fan switch supplies 220/240 VAC to the primary of the control circuit step down 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. The coil of the relay is energized, the normally open contact close, energizing the main fan motor and cooling fan. Closing the main fan switch also supplies power to heat and conveyor control.

Upon closure of the on/off switch 120 VAC is supplied through the air pressure switch, through the normally closed oven cavity and control box hi-limit thermostats to the electronic temperature control.

When 120 VAC is supplied to the temperature controller and the temperature dial is adjusted to the desired temperature, the thermocouple will provide varying millivolts to the temperature controller. The temperature controller supplies 120 VAC to the contactor coil at intermittent intervals, (closing the contactor and supplying 220 or 240 VAC to the heating elements) to maintain desired temperature.

Closing the on/off switch supplies 120 VAC to the conveyor control board. 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 will change resistance at terminals P1 & P2 varying the DC voltage to the motor. The speed of the conveyor motor will increase or decrease as the DC voltage from the board increases or decreases respectively.

NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor that senses the motor speed. Any change in motor load (± RPM) is detected by the sensor and the voltage to the motor is adjusted accordingly.

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

Image 4
Contents Impinger Conveyor Ovens Table of Contents Sequence of Operation PhaseSequence of Operations Heat Circuit Temperature Control Conveyor Drive Sequence of Operations Schematic 1450 / 1451 Schematic 1452 Schematic 1454 Schematic 1456 Schematic 1474 / 1475 Symptom Possible Cause Evaluation Troubleshooting GuideGAS Ovens Page AS Follows CodeModels 1456 1474-1475-1476 Page Page Page Impinger Advantage Series Symptom Possible Cause Evaluation Electric OvensPage Page MOTOR, Main FAN Removal Installation & AdjustmentsFAN, Main CAPACITOR, Motor RELAY, D.P.S.TCooling FAN, Control BOX THERMOSTAT, Cooling FANBurner Blower Motor Replacement Burner Control Honeywell ReplacementBurner Assembly Blower WHEEL, BurnerElectronic Temperature Control Replacement Manifold Pressure AdjustmentSolenoid Valve Thermocouple Measurement Chart Thermocouple ReplacementBurner Ignitor Burner Control Transformer -REPLACEMENT Conveyor Control Potentiometer 10K OHM ReplacementConveyor Control Board Assembly Replacement Conveyor Drive Motor ReplacementHall Effect Sensor Replacement Circuit Breaker ReplacementMain Orifice Replacement ON-OFF Switch ReplacementGAS Valve Replacement and Adjustments Ignition Control Replacement High Limit Thermostat ReplacementSpark Generator Replacement Solenoid Valve ReplacementGeneral 1450 Series Letter DescriptionGeneral 1450 Series BLOW-UP Control BOX 1450, 1451 Control BOX 1450, 1451, 1480 BLOW-UP Control BOX 1452 Control BOX 1452, 1453 BLOW-UP Contol BOX 1454 Control BOX 1454, 1455 BLOW-UP Control BOX 1456, 1457, 1474, 1475 Control BOX 1456, 1457, 1474, 1475, 1476 BLOW-UP Oven BACK, GAS Electric Oven BACK, GAS Electric BLOW-UP Conveyor 1450 Series Conveyor 1450 Series BLOW-UP