Vulcan K20GL User Manual download pdf (Page 37)

SEQUENCE OF OPERATION

(POWER TILTING OPTION)

Refer to schematic diagram AI3538 for power tilting

option and AI3537 for the main control circuit diagram

that includes Tilt Switch (2S) and Raise-Enable relay

(K3).

1. Conditions.

A. 120VAC to kettle, polarity is correct, and is

properly grounded.

B. Power switch off.

C. Tilt motor switch off (center position).

D. Kettle in the upright position.

E. Tilt switch (2S) operated, N.O. contacts held

closed (kettle arm engages switch actuator).

F. K3 raise-enable relay N.O. contacts are

open (raise-enable relay coil is de-

energized).

G. Down limit switch N.C. contacts closed.

2. Power switch on.

A. Power light (1LT) (amber) comes on.

B. 120/24VAC transformer (2T) energized.

Power to tilt motor switch common terminal.

NOTE: If the temperature dial is set to call for heat,

the ignition trial starts and module begins sparking at

ignitor.

3. Operate tilt motor switch to tilt the kettle

(momentary on - tilt).

A. K2 down relay coil is energized through

down limit switch N.C. contacts.

1) K2 4/7 N.O. contacts close.

2) K2 9/6 N.O. contacts close.

3) K2 8/5 N.O. contacts close.

B. 120VAC to DC tilt motor controller through

K2 4/7 N.O. contacts.

1) 90VDC output is activated at terminals

A + (positive) and A - (negative). DC tilt

motor powered through K2 9/6 N.O.

contacts, K2 8/5 N.O. contacts and

kettle tilts.

C. Kettle tilted approximately 10° and tilt switch

(2S) is un-operated (kettle arm disengages

from switch actuator). 2S contacts change

position from N.O. to N.C.

1) With 2S N.O. contacts open - power is

removed from control circuit and

heating stops.

2) With 2S N.C. contacts closed - Raise

enable-relay coil (K3) is energized and

K3 N.O. contacts close. No power is

transferred to K1 up relay until tilt motor

switch is operated to raise the kettle.

4. Kettle reaches full tilt position at approximately

95° and the down limit switch is operated. The

down limit switch N.C. contacts open and K2

relay coil is de-energized.

A. The three sets of K2 N.O. contacts return to

the open position. Power is removed from

the DC motor controller, the DC tilt motor

and kettle travel stops.

5. Operate tilt motor switch to return the kettle

upright (momentary on - raise).

A. K1 up relay coil is energized through raise-

enable (K3) closed contacts.

1) K1 4/7 N.O. contacts close.

2) K1 9/6 N.O. contacts close.

3) K1 8/5 N.O. contacts close.

B. 120VAC to DC tilt motor controller through

K1 4/7 N.O. contacts.

1) 90VDC output is activated at terminals

A + (positive) and A - (negative). DC tilt

motor powered through K1 9/6 N.O.

contacts, K1 8/5 N.O. contacts and

kettle raises.

2) After the kettle leaves full tilt position,

the down limit switch is un-operated

and the switch contacts return to N.C.

position. The direction of kettle travel

can then be reversed (if needed) by tilt

motor switch.

6. Kettle reaches full upright position, the tilt switch

(2S) is operated (kettle arm engages switch

actuator). 2S contacts change position from N.C.

to back to N.O.

A. With 2S N.O. contacts closed - power

restored to control circuit and heating

resumes.

B. With 2S N.C. contacts open - Raise enable-

relay coil (K3) is de-energized and K3 N.O.

contacts open. K1 up relay coil is de-

energized.

K Series Gas Kettles 2/3 Jacketed Stationary and Tilting - ELECTRICAL OPERATION

Page 37 of 44 F45461 Rev. A (0713)

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Vulcan K20GL User Manual Page 37

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