T
HEORY
Converge®
▪
Service Manual
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M N-47241
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Rev 1
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6/22
57
T
HEORY
Sequence of Operation
AC Power to the oven
1.Electrical power comes into the oven at the disconnect switch located in the back right corner
of the electrical chassis. The load side of the disconnect switch is connected to the terminal
blocks TB 1 TB 2 and TB 3, mounted on the DIN rail at the left side of the electrical chassis.
2.Mounted on the DIN rail next to the terminal blocks are circuit breakers CB 1, CB 2, and CB.
Line voltage from terminal blocks TB 1,2, and 3 is supplied to circuit breakers CB 1, 2, and 3.
One leg of line voltage is supplied from the circuit breakers to the high limits N7, N9, and N10
and then to the convection heat elements.
3.Terminal blocks TB 1 TB 2 and TB 3 supply the second of line voltage for the convection heat
elements to the solid-state relay (SSR). The oven may have a single SSR for each chamber or
dual SSRs with one SSR controlling the heating elements of two chambers. Terminal blocks TB 1
TB 2 and TB 3 also supply line voltage to circuit breakers CB 4 and CB 5. CB 4 and CB 5 supply
line voltage to terminal blocks TB 16 and TB 22.
4.The voltage from the terminal blocks is then supplied to the voltage monitor, the check fans
thermo switches, the check fan LED, the check fans relay, the electric catalytic converter, the
catalytic converter relay, the CV drive relay, and the DC power supply.
5.The voltage monitor converts the AC input voltage to a DC output voltage that is used by the
oven control to determine the input line voltage.
6.There are two check fan switches installed in the oven, one switch is mounted in the electrical
chassis and the other switch is mounted near the convection fans. The switches are wired in
parallel. When either switch is exposed to a temperature of 130°F the switch contacts will close,
the check fan LED on the control panel will illuminate and the check fans relay will be
energized.
7.When the contacts in the check fans relay close, a signal is sent to the oven control and the
oven control will display the E108 error message on the control panel display.
8.The electric catalytic converter relay is energized by the control board, when the relay
contacts close, line voltage is supplied to the catalytic converter heating element.
9.On the first call for heat the CV Drive Relay is energized by the control board. When the relay
contacts close, line voltage is supplied to terminal block TB 26, the cooling fans are energized,
and the Variable Frequency Drives (VFDs) are enabled.
DC Power to the oven
1.The DC power supply converts line voltage to 12 volts DC output.
2.DC voltage is supplied to the interface board.
3.The DC voltage is also supplied to terminal blocks TB 32 and TB 34, the voltage from the
terminal blocks is then supplied to the control board and the hand shower relay.
4.The initial Alto-Shaam logo screen is displayed.
5.The humidity valves perform a self-test.
Screen ‘ON’ Pre heat
1.The oven preheats in convection mode only, not in steam mode.
2.The preheat can be set in the settings screen to auto preheat or be started manually.
3.The door must be closed for preheat to function.
4.The convection fan motor starts rotation and provides a speed feedback signal to prove
motor operation.
5.The Hall Effect Sensor (HES) in the motor provides the feedback signal to the oven control.
The motor operation must be verified before the heating elements will be energized.
6.The N6 chamber temperature probe provides a signal to the oven control indicating the
chamber air temperature.
Summary of Contents for Converge CMC-H2H
Page 4: ...FOREWORD Converge Service Manual MN 47241 Rev 1 6 22 4 This page is intentionally left blank ...
Page 55: ...COMPONENTS Converge Service Manual MN 47241 Rev 1 6 22 55 Filter Cooling Air VMC PHD 002015 ...
Page 60: ...THEORY Converge Service Manual MN 47241 Rev 1 6 22 60 This page is intentionally left blank ...
Page 139: ...SCHEMATICS Converge Service Manual MN 47241 Rev 1 6 22 139 ...
