Ohmart Vega W-4510, Technical Reference Hardware Manual

Page: 39 / 162

Installation
22 W-4510 Weigh Scale Technical Reference Manual
•
Access keys and indicators
On/Off switch with circuit breaker and pilot light
A/C power enters the power supply board, from the back panel I/O board, after passing
through On/Off switch. There are two types of switches to use, depending on the power
source. They are:
•
110VAC
•
220VAC
CPU board
The CPU board enables communication to and from the field equipment. The CPU board is
the main controller of the Smart Pro or Pro Pac and should be jumpered in the isolated
configuration (refer to page 45 for details on read/write protect on JP-17). This provides
isolation at the wall or rack mount display/interface side for analog output #1 (density) and
from analog output #2 (position). Figure 9 illustrates the CPU board.
Figure 9: Simplified CPU board
The software PROMS contain the program for operating the Smart Pro or Pro Pac. Install
them at locations U24 and U25 on the CPU board. Optional EEPROM chips install into
location U26.
The battery-backed RAM chip installs at location U27. This is a non-volatile memory when
the battery is functioning. The estimated battery life is 10 years.
Programmed ROM chips
Write enable jumper - remove
to write protect
EEPROM Battery backed RAM
DC to DC converter
R48 is 100K
R46 is 10K
JP10 cut traces 3-4 and 5-6
JP11 cut traces 1-2 and 3-4
Install capacitor C14
Install communication chip U10
Jumper locations
JP1 None
JP2 None
NP3 1-3, 2-4
JP4 1-3, 2-4
JP5 1-3, 2-4
JP6 5-6
JP9 1-2,7-8
JP10 Cut traces 3-4 and 5-6
JP11 Cut traces 1-2 and 3-4
JP12 1-2, 7-8
JP13 1-2
JP14 1-2
JP15 (solder traces)
JP16 (solder traces)
JP17 9-10 (write enable/protect)
JP18 (solder traces)
JP19 (solder traces)
JP20 2-4