9gas oven theory of operation – XLT XD-9006B User Manual

Page 9

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9

GAS OVEN THEORY OF OPERATION

CAP - The Capacitor is physically mounted inside the Control Box but wired to the externally
mounted Oven Fan Motor (M1). The Oven Fan Motor (M1) is a Permanent Split Capacitor (PSC)
motor. PSC means a capacitor motor in which the starting capacitor and the auxiliary winding re-
main in the circuit for both starting and running. The CAP is a 30.0 uF +/- 6% 370VAC/B 50/60
Hz

CB - Circuit Breakers are used to protect electrical components. The current value is printed on
the front of all breakers. If a CB is tripped, eliminate the cause and press the front to reset.

CC - The Conveyor Control is supplied 24 VDC by the Power Supply (PS) via a Circuit Breaker
(CB6 & CB7, optional) to Terminals 4 & 5. The belt time is displayed, and is user-adjusted by
pressing and holding the up or down arrow button switches. See the Specification Sheet for mini-
mum and maximum belt times. The motor speed is calculated based on the time that is entered.
This time is translated to a RPM on the motor shaft depending on the size of the oven, the diameter
of the sprocket, and the gear ratio of the gearbox. Once the motor is running, hall sensor inputs are
fed back into the driver to determine the speed the motor is currently running at. This input goes
into a PID algorithm to adjust the Pulse Width Modulation (PWM) output to control the speed to
match the target speed that was calculated first. This PWM is adjusting the average voltage that
the motor phases are seeing. As the average voltage goes up, the motor will speed up. As the av-
erage voltage drops, the motor speed will also drop. The maximum speed is based on a continuous
18-24V being supplied to the motor. The phasing of the controller is dependent on the hall sensor
signals that are being returned. The controller reads the hall sensor position and from there knows
which phase of the motor receives the 18-24V signal, which phase of the motor is the return and
which phase of the motor is left open. As the motor spins, the hall sensors change, which dictate
which phases are energized.

FLT 1 - Is an inline filter used in world ovens. The filter is placed in series with the Line voltage
being supplied to the oven. The filter is used to reduce Electromagnetic Interference created by our
equipment and back feeding it into other appliances. EMI filters use capacitors to inhibit direct
current while permitting alternating current. EMI filters also use inductors which redirect high
voltages, and high frequencies by dissipating them to ground.

FS Optical - The Optical Sensor consists of a plastic housing and an flame detector mount with
mirror. The optical sensor utilizes 24VDC which originates at the PS. The positive line is supplied
via the TC1 terminal 1&2 and terminates at the connector for the sensor. The negative line is sup-
plied via the TS #5 and terminates at the connector for the sensor. If the TC1 alarm would activate
and open the circuit, the optical sensor will loose voltage and cause the oven to shut down burner
functionality until alarm is closed. From the connector a brown wire sends a 6.75 μA signal to the
S1 Terminal of the IC. The minimum signal to maintain operation is .7 μA.


When flame is present, the sensor visually looks at the Flicker rate and the UV charactistics of the
flame. If either of these do not appear the sensor will not send current to the IC. The ignition will
continue thru its process until lockout.

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