Lincoln Impinger X2 Ovens with Push Button Controls 3240-2 - Manual (Page 3)

Impinger X2 – Analog Service Manual – Dom & Int’l 3
SEQUENCE OF OPERATION
IMPINGER X2 OVENS
3240-2* 230VAC 50 HZ. 1 PHASE
3262-2* 230VAC 50 HZ. 1 PHASE
3270-2* 230VAC 50 HZ. 1 PHASE
*NOTE:
Model number ending in TS indicates top belt is split belt
Model number ending in SB indicates bottom belt is split belt
Model number ending in SS indicates both belts are split belts
POWER SUPPLY Electrical power to be supplied to the oven by a three conductor service for single phase
or a five conductor service for three phase.
Black conductor is hot.
Red conductor is hot.
Orange conductor is hot.
White conductor is neutral.
Green conductor is ground.
MAIN FAN CIRCUIT Power is permanently supplied to the normally open contacts of the main fan relay.
Power is also supplied, through a 2 amp. fuse, to the 30 minute time delay relay.
Closing the oven fan switch enables the 30 minute time delay relay. The 30 minute time
delay relay supplies 220/240VAC to the coil of the main fan relay. These normally open
contacts now close energizing the main fan motor. Closing the main fan switch also
supplies 220/240VAC to the burner and conveyor switches.
BURNER CIRCUIT Closing the main fan switch supplies 220/240VAC to the normally open burner switch.
Closing the burner switch supplies 220/240VAC, through the EMI filter, to the electronic
temperature control. 220/240VAC is supplied, through the air pressure switch and the
oven cavity hi-limit thermostat, to the burner control. When the burner control is
energized, 220/240VAC is supplied to the burner blower motor. The normally open air
pressure switch closes upon sensing air pressure. After a pre-purge of 30 seconds, the
pilot valve and spark are energized. Ignition should now occur. After the pilot flame is
proven, the main valve is energized.
TEMPERATURE CONTROL Closing the main fan switch and burner switch supplies 220/240VAC to the electronic
temperature control. The electronic temperature control is adjusted to the desired
temperature. The thermocouple will provide varying millivolts to the electronic
temperature control. The temperature control supplies 220/240VAC to the temperature
regulation valve at intermittent intervals to maintain desired temperature.
CONVEYOR DRIVE
NOTE:
THE OVEN WILL CONTAIN BETWEEN TWO AND FOUR SEPARATE CONVEYOR
DRIVE SYSTEMS. THE SEQUENCE OF OPERATIONS WILL BE THE SAME FOR
EACH MOTOR SYSTEM.
Closing the main fan switch supplies 220/240VAC, through the EMI filter, to the normally
open conveyor switch, through a 2 Amp. fuse, to the conveyor control. AC voltage is
converted to DC voltage and DC voltage is supplied, at terminals A+ and A-, to the
conveyor motor. Adjusting the conveyor control will vary the DC output voltage. The
speed of the motor will increase or decrease as the DC voltage from the conveyor
control increases or decreases.
The conveyor control uses a hall effect sensor and magnet, mounted on the conveyor
motor that senses motor speed. The sensor detects any change in motor load (
± RPM)
and the voltage to the motor is adjusted accordingly.
AUTOMATIC COOL DOWN When the oven is started, the 30 minute time delay relay is enabled, permitting the oven
fan to operate for approximately 30 minutes after the oven is shut off, to cool the oven.
When the oven is shut off, the 30 minute time delay relay will keep the coil of the main
fan relay closed for 30 minutes, maintaining operation of the main fan motor.