Ohmart Vega W-4510, Техническое руководство по аппаратному обеспечению

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Installation
W-4510 Weigh Scale Technical Reference Manual 23
I/O termination board
The I/O termination board provides AC power termination along the interconnecting
termination points for the field unit. Its location is at the back of the case. Analog outputs and
the optional DCS interface box terminate on this board.
Case
The case is the enclosure for the wall or rack mount display/interface.
Power supply
The power supply converts incoming A/C power into
±
15VDC and +5VDC. The wall or rack
mount display/interface uses these three DC voltages. Ohmart/VEGA hardwires the power
supply board to accept either 110VAC or 220VAC.
Hinged front panel
The hinged front panel provides access to the inside of the wall or rack mount
display/interface.
Processor select circuit board
On the rack mount unit only, the processor select circuit board controls the select keys (A-B-
C-D) that correspond to the possible four field units. The operator presses a select key to
access one of the four field systems.
Key pad assembly
The keypad assembly contains both the basic keypad (data and function keys) and the
processor select keys. It connects to the processor select circuit board.
LCD display interface circuit board
The LCD display interface circuit board receives information from the processor select circuit
board and converts it into a format that the LCD display uses for viewing.
Operator display/interface
The front of the rack mount display/interface has four main areas. These areas are:
•
Liquid crystal display (LCD) window that can be multiple windows if there is more than
one field unit
•
Data entry keys
•
Special function keys
•
Access keys and indicators