Electrical Operation; Component Function - Vulcan-Hart VE30 Service Manual

COMPONENT FUNCTION

Temperature Controller . . . Monitors thermocouple input (type E) and regulates braising pan temperature.
120/24VAC Transformer . . . Supplies 24VAC for heating control circuit. If motorized pan lift option is
240-480/120VAC
Transformer . . . . . . . . . . . . . Supplies 120VAC for control circuit.
ON/OFF Switch . . . . . . . . . . Controls 24VAC to the heating control circuit. If motorized pan lift option is
Power On Light (Amber) . . . Indicates on/off switch is turned on.
Heat Light (Red) . . . . . . . . . Indicates temperature controller is calling for heat and pan is down.
Pan Position/
Down Limit Switch . . . . . . . N.O. contacts function as pan position switch to power the heating circuit when
Fuses F1 & F2 . . . . . . . . . . . Protects control circuit if current exceeds the rated amperage.
K3 Heat Relay . . . . . . . . . . . Supplies power to contactor coils C1, C2 & C3.
Contactors C1, C2, C3 . . . . Supplies line voltage to heating elements.
Heating Elements . . . . . . . . Produces heat for the braising pan cooking surface.
High Limit Thermostat . . . . Prevents braising pan from reaching excessive temperatures by removing
DC Motor Controller . . . . . . Controls DC lift motor operation for raising & lowering of the pan, and provides
DC Lift Motor . . . . . . . . . . . . Operates gear reducer to raise or lower the pan. When the correct voltage
Lid Switch . . . . . . . . . . . . . . Controls 24VAC power to lift control switch. Used to ensure lid is open before
Lift Control Switch
(Momentary On/Off/On) . . . Energizes K1 relay coil thru up limit switch contacts (N.C.) to raise the pan.
Up Limit Switch . . . . . . . . . . Removes power from K1 relay coil when pan reaches full tilt (pan travel stops).
Pan Position/
Down Limit Switch . . . . . . . N.C. contacts function as down limit switch to remove power from K2 relay coil
ELECTRIC BRAISING PANS - ELECTRICAL OPERATION

ELECTRICAL OPERATION

BRAISING PAN CONTROLS
An external set point potentiometer is used for temperature adjustments.
installed, supplies 24VAC for lift control circuit.
installed, controls power to the lift control circuit.
pan is down. Removes power from heating circuit when pan is raised. The N.C.
contacts are used for the down limit switch (motorized lift option only).
power to contactors. Monitors surface temperature of the insulation cover and
not the pan. Open at 400 / F; close at 360 / F (auto reset).
MOTORIZED PAN LIFT OPTION CONTROLS
motor acceleration control each time the controller is powered. The controller
outputs approximately 90VDC to power the motor.
polarity is applied thru K1 contacts, motor rotates CW to raise pan. When
reverse voltage polarity is applied thru K2 contacts, motor rotates CCW to lower
the pan.
pan can be raised.
Energizes K2 relay coil thru down limit switch contacts (N.C.) to lower the pan.
The switch positions are: Center neutral (starting) position off; Momentary on -
lower pan; Momentary on - raise pan.
when pan is lowered to the down position (pan travel stops). The N.O. contacts
are used for the pan position switch.
Page 21 of 32 F35410 (May 2003)