Chicago Dryer King Edge VAc, Instruction Manual

Page: 87 / 302

King Edge Vac Operating Principles
5-9
Control System
Various components work together to control
the work of the machine. This control system
includes:
CHI Panel
Photosensors
Encoders
Proximity Sensors
Control of the machine is done in two areas.
Input from the operator takes place at the CHI
Panel, located on the outside of the unit. These
commands are combined with internal signals in
the MPC1 control board.
CHI Panel
Operators control the unit with the Chicago
High Intelligence (CHI) panel located on the
front of the right endframe. The OPERATING
GUIDELINES
chapter and
CHI PANEL
OPERATION bulletin discuss the use of this
panel.
Inside the panel is MPC2. This board accepts
the operator inputs from the membrane switches
on the front of the panel and sends them to the
MPC1 control board in the right endframe. In
addition, the MPC1 control board sends operation
and diagnostic messages to the CHI Panel. These
are shown in the display at the top of the panel.
A four-wire cable provides communication
between the CHI Panel and the MPC1 control
board. Two LED’s on the board show when it is
receiving information from the CHI Panel (RX)
and sending data to it (TX).
Communications and the Boards
All the input signals from the sensors go
through input cards which then pass them to one
of two MPC1 control boards, which also power
the sensors. When the appropriate LED on the
input card and on the MPC1 control board come
on, it means that a signal has been received
from a sensor. Each LED is numbered for easy
identification.
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Output signals from the right endframe MPC1
control board go through an output card before
they get to the output devices. These devices are
also powered via the MPC1 board. Output from
the left endframe MPC1 board goes directly to
the devices it controls.
Most output devices like air valves, relays, and
indicators run on the 24 VAC that comes right
from the MPC1 control board. For other devices
that require a different voltage, the MPC1 control
board or the output card sends an open collector
output signal to drive the logic input on a separate
driver board.
When the appropriate LED on the MPC1
control board comes on, it shows that a signal
has been sent to a device. The LED on the MPC1
control board comes on to show that the board is
functioning properly. The LED will light even if
the output fuse on the board is blown.
For open collector output, the LED means that
the MPC1 control board is sending the signal to
the driver card. The LED will not come on if no
driver is connected. Each LED is numbered for
easy identification.
Figure 5-6: CHI Panel.
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