Lincoln Impinger Conveyor Ovens 1454 - Manual (Page 2)

Impinger I -–Adv Digital – Electric Service Manual - International 2
SEQUENCE OF OPERATION
IMPINGER ADVANTAGE
SERIAL NUMBER N28654 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
MODEL
1421-000-E 230/400 VAC 50 HZ. 3 PHASE
POWER SUPPLY Electrical power is to be supplied to the oven by a five conductor
service.
Brown conductor is hot.
Black conductor is hot.
Black conductor is hot.
Blue conductor is neutral.
Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN When the temperature in the control box reaches 120
°F ± 3°F (48.9°C
± 1.7°C), the cooling fan thermostat will switch power to the control
box cooling fan. The thermostat will interrupt power to the cooling fan
when the control box temperature falls to 100
°F ± 3°F (37°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied through three 50 A fuses to
the normally open contacts of the hi-limit contactor. Power is also
supplied, through the 10 Amp motor and control fuse, through the
normally closed control box hi-limit thermostat, to the normally open
oven power switch. Power is also supplied to the control box cooling
fan thermostat. Closing the oven power switch supplies line voltage to
the main fan motor. Closing the oven power switch also supplies line
voltage to the heat circuit and to the primary of the oven control
transformer.
HEAT CIRCUIT Closing the oven power switch supplies line voltage through the main
fan air pressure switch, through the normally closed oven cavity hi-limit
thermostat, to the oven control
TEMPERATURE CONTROL Closing the oven power switch supplies line voltage, through the EMI
filter, to the primary of the control transformer and through the air
pressure switch and oven cavity hi-limit, to the oven control.
Secondary voltage, 24VAC, is supplied to the oven control. The oven
control is set to desired temperature. The thermocouple will provide
varying millivolts to the oven control. The oven control supplies line
voltage to the heat contactor at intermittent intervals to maintain
desired temperature. The display on the oven control will indicate
when the heat contactor is energized.
NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE Closing the oven power switch supplies line voltage to the conveyor
motor and to the primary of the control transformer. Secondary
voltage, 24VAC, is supplied to the oven control. Setting the oven
control to the desired time outputs voltage, through a reversing switch,
to the conveyor motor.
NOTE: The conveyor system uses a hall effect sensor and magnet to
prove operation of the conveyor motor. If the motor is not running,
“BELT JAM” is indicated on the display.