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TurboChef Technologies, Inc. C Series
7-2
DOOR SWITCHES AND CIRCUIT
BREAKERDOOR SWITCHES
The C series ovens have 3 door switches as
mandated by law. The C3/AB and C3Multi have
one door switch located on the left hand side
(CDS) and is called the secondary switch. The
other two switches are located on the right hand
side (CDP & CDM). One is called the primary
switch (CDP) and the other is called the monitor
switch (CDM). The C3/C and C3/CMulti switch
orientation is reversed, i.e., the monitor (CDM)
and the primary switch (CDP) are located on the
left side of the oven. The secondary (CDS) is
located on the right side of the oven.
The monitor switch must close before the primary
and secondary switches close (as the door is
closed) or the circuit breaker will trip. If the
primary or secondary switch is defective and not
closing the screen will display a door open error
message. To determine what sequence the doors
are closing in, you will need to access the Test
mode and activate the Test mode. By doing so,
you will activate the status indicators at the lower
left bottom of the display. Slowly close the door
once you have activated the Test mode and
observe the status indicators. As you close the
door the M indicator must change from a
highlighted state followed by the S indicator and
final the P indicator. As you open the door, the
sequence must reverse, i.e., P, S and then M. If
this sequence is not correct, YOU MUST
READJUST THE SWITCHES. See section 7-6.
"WHY DOES THE CIRCUIT BREAKER
TRIPPED IF THE SWITCHES ARE
MISALIGNED?
"In addition to the High Voltage circuit, it is
imperative to understand how the monitor circuit
operates. The Monitor Circuit is a failsafe circuit
that is designed to protect the operator if both the
Primary and Secondary Interlock Switches fail to
operate normally.
The Monitor Circuit consists of the Primary
Interlock Switch, Secondary Interlock Switch,
Monitor Safety Switch, Monitor Relay and Trip
Coil. When the Cook Door closes during normal
operation, the Monitor and Secondary/ Primary
Switches close in this order. When all switches
are closed, the microwave system is allowed to
operate. If during normal operation, either
Interlock Switch opens, such as when the Cook
Door opens, the Control system will turn OFF the
Microwaves; however, if the Monitor Switch
opens before both the Primary and Secondary
Interlock switches, i.e., abnormal operation, the
Monitor switch will de-energize the Monitor
Relay. When this occurs, a dead short is placed
across L1 and L2. The short then trips the coil on
the circuit breaker, which permanently interrupts
power to the Microwave system, thus terminating
a cook cycle if the oven was cooking and
preventing the heaters from energizing. This then
requires a service call from a qualified technician
to assure that the monitor circuit is properly
repaired to prevent excessive microwave
radiation.