Middleby Cooking Systems Group PS520E - Manual (Page 14)

10
Figure 3-2. Interior View of Control Console
SECTION 3
OPERATION
II. COMPONENT INFORMATION AND
LOCATION (Figures 3-1 and 3-2)
A. Door Safety Switch
The Door Safety Switch is located at the lower right side
of the control panel opening. Opening the control panel
door permits this switch to open, disconnecting power
to all electrical controls.
B. Blower Switch
The blower switch has two positions. The switch must
be “ON” or “I” for the main blowers to come on and permit
the oven to run. The fan circulates the air throughout the
oven and must stay on during baking and during the
cool down cycle above 200
0 F (93 0 C) to prevent blower
bearing damage. To protect the blower motor and
bearings a thermostatic override is built into the oven.
CAUTION
Do NOT touch the wires going to this
safety switch. Current is always present.
If the temperature of the oven is over 200 0 F (93 0 C) the
main blower will continue to run after the blower switch
is turned to the “OFF” or “O” position.
C. Heat Switch
Turning the HEAT switch to “ON” or “I” will energize the
electric heating system. This switch is in series with the
blower fan motor and high temperature override switch.
Both switches must be closed before the heating
elements can be energized.
D. Temperature Controller
The temperature controller is a solid-state, PID type to
maintain the operator-set temperature. The temperature
controller continuously monitors the oven temperature
and turns on the modulating solid state relay controller.
The heat is on for the time required to maintain a
consistent oven temperature.
The temperature controller contains a low-limit switch
which allows the oven to cool down to 200
0 F (93 0 C)
before shutting off the blower. A high-limit indication
(ALM1) will appear on the display if the oven reaches
650
0 F (343 0 C). Temperature
Controller
Door Safety
Switch
Conveyor Speed
Digital Control
Conveyor Speed
Control Module
Conveyor
Drive Motor