Lincoln Impinger II - Advantage Series - Manual (Page 4)

Impinger II – Advantage Service Manual - Domestic 4
SEQUENCE OF OPERATIONS
1130-000-A / 208V / SINGLE PHASE
1131-000-A / 240V / SINGLE PHASE
1132-000-A / 208V / THREE PHASE
1133-000-A / 240V / THREE PHASE
POWER SUPPLY
Electrical power to be supplied to the oven by a three-conductor service on single
phase and a four-conductor service on three phase.
Black conductor is Hot
Red conductor is Hot
Orange conductor is Hot (Used on 3 phase only)
Green conductor is ground.
CONTROL BOX AUTO COOL DOWN When the temperature in the control box reaches 120°F ± 3°F (48.9°F ± 1.7°C),
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).
MAIN FAN CIRCUIT
Power is permanently supplied through the 10A fuses, through the normally
closed control box high limit thermostat, to the normally open main fan switch.
Power is also supplied to the normally open cooling fan thermostat. Closing the
main fan switch supplies 208/240 VAC to the main fan motor, the cooling fan
motor, to the primary of the temperature display transformer and to the heat and
conveyor circuits.
HEATER CIRCUIT
Closing the fan switch supplies 208/240 VAC, through the normally open air
pressure switch (closed by air pressure from the main fan) through the normally
closed oven cavity hi-limit thermostat, to the electronic temperature control. The
1K ohm temperature pot is adjusted to desired temperature. The thermocouple
will provide varying millivolts to the temperature controller. The temperature
control then supplies 208/240 VAC to the coil of the contactor at intermittent
intervals to maintain the desired temperature. The heat lamp is energized with
the contactor.
CONVEYOR DRIVE 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 and 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.
Temperature Display
Closing the switch supplies 120 VAC to the primary of the temperature display
transformer. The secondary of this transformer supplies 12 VAC to the
temperature display. The thermocouple supplies D.C. millivolts to the
temperature display. The display converts this millivolt reading to a temperature
reading.