Blodgett MT2136 Series, Service And Repair Manual

Page: 38 / 94

OPERATION
3-14
with an ohm meter. The SPST thermal
switch is located in the rear of the conĆ
vection fan compartment.
5. The conveyor is driven by an open loop DC
control system consisting of a DC speed conĆ
trol board (5), a 130 VDC motor (21) and the
DAC located in the cooking computer (1). If a
time is programmed into the cooking computĆ
er, a voltage ranging between .47 and 4.7 is apĆ
plied to the DC speed control board. The outĆ
put voltage measured at A1 and A2 of the
board to the motor varies from 20 to130 VDC
based on the DAC voltage applied to the board
or the time programmed into the computer.
NOTE: The DAC receives 20 VDC from the
speed control boards. The DAC reĆ
turns a portion of the voltage (between
.47 and 4.7 VDC). The amount of voltĆ
age is dependent on the time proĆ
grammed into the computer.
NOTE: This type of system does not sense the
weight of the product and will slow
down slightly if the belt is fully loaded.
NOTE: This oven, supplied with remote conĆ
trol, is equipped with an emergency
shut down switch. Should you need to
stop the belt, fans, or heat press the
emergency switch. Do not use the
emergency switch as a GENERAL
on/off switch!