Middleby Cooking Systems Group PS520E User Manual download pdf (Page 14)

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

F (93

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

F (93

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

F (93

before shutting off the blower. A high-limit indication

(ALM1) will appear on the display if the oven reaches

650

F (343

C).

Temperature

Controller

Door Safety

Switch

Conveyor Speed

Digital Control

Conveyor Speed

Control Module

Conveyor

Drive Motor

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

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Middleby Cooking Systems Group PS520E User Manual Page 14

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