CONVEYOR OVEN SERVICE MANUAL
14
Reversing Switch
The reversing switch located on the front panel changes
the direction of the conveyor belt. The direction should
be set when the unit is installed. If a change of direction
in the belt is wanted, it is highly suggested that the unit
be placed in standby and the switch changed. This will
prolong the life of the conveyor motor and controller.
24VDC Power Supply
The oven uses a 24vdc power supply to only power the
conveyor speed control board. This board is located
behind the controls on the front electrical panel and has
the 3 Amp fuse connected between it and the control
board. The 208/240 voltage is supplied from the On/Off
rocker switch.
Conveyor Speed Controller
The conveyor speed controller powers the conveyor
motor through a single Molex connector. The board uses
a potentiometer to control the desired speed which is
only sold with the board as an assembly. Once again,
the controller is powered by the 24VDC power supply.
The belt speed ranges between 1 - 18 minutes based
on the setting on the control panel.
Conveyor Motor
The conveyor motor is a proprietary motor designed for
use in this oven. It is a DC Motor using a gear reduction
drive to increase torque and speed accuracy. In the
event of an object being jammed in the conveyor, belt
assembly is protected from catastrophic damage from
the 3 amp fuse inserted in the power out put of the
power supply.
Temperature Controller
The temperature controller sends 208/240 AC coil
voltage to the contactor when calling for heat. The board
is powered by the On/Off switch and uses a Amber light
to indicate when the board is calling for heat. A separate
RTD is used to monitor the temperature in the cook
cavity.
Electrical Compartment Cooling Fan
The electrical compartment cooling fan is a 208/240V
axial fan located on the back of the compartment. The
fan pulls cooling air through the openings placed at the
bottom of the compartment and directs the air out of
the back. The fan operation is controlled by either the
On/Off rocker switch or by the electrical compartment
thermostat.
Contactor
The contactor is responsible for sending power to the
elements when the temperature controller calls for
heat. The controller sends 208/240 to the coil of the
contactor. The contactors are not voltage specific and
can be used with both single phase and three phase
power. If the oven’s voltage is converted in the field,
only the element needs to be replaced.
SPST Relay
Three single pole single throw relays are used to supply
one leg of power to the heater elements (L2). The coils
of these relays are powered by the output of the high
limit switch. When the oven is connected to power
and the high limit switch is not tripped, one side of the
elements will have power applied.
OVEN SYSTEMS
Due to the design of the electrical circuit, the unit
is never truly in an “Off Mode”. When the power
switch is set to “standby” , electricity is still
present in the control panel. Always disconnect
the power from the wall before opening the
control panel
WARNING
