Lincoln 1628-000-A - Manual (Page 2)

Low Profile – 1600 Series Adv Dig Electric S.M. – Int’l
2
SEQUENCE OF OPERATIONS
IMPINGER ELECTRIC LOW PROFILE ADVANTAGE
(WITH PUSH BUTTON CONTROL)
MODEL 1621-000-EA 230/400 VAC 50HZ
MODEL 1628-000-A 220/380 VAC 50HZ
MODEL 1629-000-A 224/415 VAC 50HZ
POWER SUPPLY Electrical power 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 either one of the control boxes reaches 120 ° F ± 3 ° (49 ° C ±
1.7 ° ), the cooling fan thermostats will switch power to the cooling fans. The thermostats
will interrupt power to the cooling fans when the temperature falls to 100 ° F ± 3 ° (37 ° C ±
1.7 ° )
MAIN FAN CIRCUIT Line voltage is permanently supplied (through a power filter) to a normally open contact of
the oven power switch. Line voltage is permanently supplied to the two normally open
cooling fan thermostats. Closing the oven power switch supplies line voltage, through both
normally closed control box hi-limit thermostats, to the oven power relay. Its contacts now
close supplying line voltage to the two main fan motors. Closing the oven power switch also
supplies line voltage to the control box cooling fans, the oven control, the control
transformer, and the conveyor motor.
TEMPERATURE
CONTROL
Closing the oven power switch supplies line voltage, through the 10 amp. fuse, through the
oven power relay, to the primary of the control transformer. 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 contactor
at intermittent intervals to maintain desired temperature. The display on the oven control
will indicate when the contactor is energized.
NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE Closing the oven power switch supplies line voltage, through the 10 Amp fuse, through the
oven power relay 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 magnet and hall effect sensor to prove operation of
the conveyor motor. If the conveyor motor is not running, “BELT JAM” is indicated on the
display.
AUTOMATIC COOL
DOWN
When the oven is started, the time delay relay timing circuit is enabled, permitting the oven
fans to operate for approximately 20 minutes after the oven is shut off, to cool the oven.
The time delay relay will keep the coil of the motor relay closed, maintaining operation of
main fan and cooling motors.