AEC OS Series Gravimetric Batch Blenders - Manual (Page 91)

Page 90 of 118
The weigh hopper dump valve output functions similar to the mix motor
output. Please refer back to the wiring diagram. The origin of the weigh
hopper dump signal is a control port located on the CPU board PC-1.
This signal is routed through SSR-2. SSR-2 then converts the + 5 volt DC
signal to a 110 volt AC signal to drive the solenoid. The weigh hopper
dump solenoid is the first valve from the left when viewing the valve stack
on the rear of the OS/OA Blender.
To protect the circuitry in the event of component failure, the SSR module
incorporates a built-in fuse located on the very top of the module. This
fuse is properly sized to protect the SSR module.
The auger motor outputs are driven from a control port located on the
CPU board. These outputs are also driven through SSR modules. These
modules are SSR-3 through SSR-6. Each of these modules contains
protection fuses. In the event of an auger jam or motor overload, the
module fuse will protect the SSR module and the CPU board’s control
port.
Each OS/OA blending system comes complete with a customer alarm
output. This output is driven from a control port located on the CPU board
PC-1. It is routed through a solid-state relay module designated as SSR-
7. The contacts on this module are rated from 20 - 220 volts AC. The
module contains a fuse that is limited to 3 amps.
The customer alarm output is provided to actuate or energize a variety of
alarm horns, buzzers, strobe lights, and beacons. These are normally
provided by the customer, and care will have to be exercised not to
exceed the maximum current draw (3 amp fuse). The contacts will close
whenever the control detects a fault that will somehow inhibit the blending
system from properly blending the material.
Note:
The customer alarm contact is open if the panel control power is
turned off.
This contact is for use with a customer supplied alarm device as
described above.
The alarm contact is fused for a maximum load of 3 amps.