6-3 input signals to control panels – AEC OS Series Gravimetric Batch Blenders User Manual
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The control panel power is routed to the internal power supply, after
going through the safety circuit. The CPU board’s power supply is
designated as PS-1 and located on the back plate of the control panel.
PS-1 is a multi-voltage switching power supply. Its outputs of +5 Volts DC
and +12 Volts DC are used for the main CPU board and the optional
remote control panel (RCP), if it is installed. The power supply also has
optional voltages of -12 Volts DC and -5 Volts DC, which are currently not
used. (+5V should be set to +5.3V)
Located on this power supply is the main control fuse. This control fuse is
on the 110-volt side, or the input side of PS-1.
Below the power supply is the main CPU board. This CPU board is
designated as PC-1. This device contains all of the control logic for the
OS/OA blending system. It is truly the heart of the OS/OA System.
Input to the CPU can be found at the +5 volts that is used to power up the
CPU, also connected to the main CPU is the 16 key operator keypad.
This keypad is located on the front door of the control panel. This keypad
is used to obtain all operator input. Located right beside the keypad on
the figure is the 2-line by 40 characters LCD (liquid crystal display). This
display is used to provide all information to the operator.
Directly to the left of PC-1 on the figure is located the hardware key. This
hardware key is used to determine the software access code to ensure
that the software is not copied and duplicated by others than
HydReclaim.
To the right of PC-1 on the wiring diagram figure, there are several solid-
state relays. These devices are used to convert the CPU logic level
outputs from the +5 volt DC signals to the 110 volt AC signals required to
operate the solenoid valves and augers on the blender. These solid-state
relays are designated as SSR-1 through SSR-7.
Located below the solid-state relays is a 110 volt input module this
module is responsible for changing the 110 volt input signal from the
high-level proximity switch into + 5 volt DC signals for the CPU. The
module is designated as SSR-8.
6-6-3 Input Signals to Control Panels
The OS/OA blending system has two main input signals that it uses from
the blending process: the mix hopper high level signal and the weigh
hopper load cells. This, of course, does not include the operator keypad
input.