Hardy ANY-WEIGH Bench Scales - Manual (Page 39)

Chapter 7 - Operation
7-3
Analog Scale The ANY-WEIGH Analog Scale powers itself and the
attached strain gauge transducers from the 4-20 mA
loop power. This allows sensitive strain gauge signals
to be transmitted over long distances without the
expense of installing additional power to remote loca-
tions. A common, low-cost power supply can be
placed anywhere in the 4-20 mA loop.
As the power supply provides loop power, the Analog
Scale controls the current flow (4-20 mA)_ represent-
ing the strain gauge signal and receiving devices can
be placed anywhere along the loop to monitor current
flow. Typical receiving devices include.
• Chart Records
• Panel Meters
• Bar Graphs
• Programmable Controllers
• Computers
• Relay Set Point Modules
MINOR FAULT
AND/OR CON-
NECTION TIME-
OUT FLASHING
RED RECOVERABLE FAULT A/D ERROR, USUALLY
CAUSED BY BAD CONNECTION TO LOAD CELLS
LOAD CELL OUT OF RANGE. SENSE LINES
MUST BE INSTALLED.
CRITICAL
FAULT OR LINK
FAILURE RED UNRECOVERABLE FAULT (Board may need
replacing)
FAILURE IN A-D
STATE LED INDICATION
Table 7-2: SCALE STATUS