Kistler-Morse KM Weigh II - Manual (Page 7)

Chapter 1. Weigh II Introduction
Introduction
The Weigh II is a multichannel signal pro-
cessing and display system that will receive
analog inputs and digital serial communica-
tions from a master device. The Weigh II can
monitor up to four vessels instrumented with
Kistler-Morse L-Cells, Microcells,
Load Stand II’s, Load Disc II’s, or Load Links,
or with full bridge, foil gage sensors from
other manufacturers. The Weigh II has an
integral, weather-sealed membrane keyboard
and a large LCD display that provide easy
access for programming and viewing param-
eters and allows the user to input their own
unique vessel identifications. The enclosure is
NEMA-rated, and is wall-mounted. The
Weigh II is available in both AC-powered and
DC-powered versions.
Figure 1-1. The Kistler-Morse Weigh II Strain
Measurement Signal Processor
Modular PCBs
The Weigh II’s modular design provides for
easy system configuration to the specific
needs of your application and allows for
expansion to meet future requirements.
Kistler-Morse’s flexible system allows easy
interconnection to a variety of Programmable
Logic Controllers (PLCs).
The motherboard inside the Weigh II enclo-
sure has three Printed Circuit Board (PCB)
card positions. Optional, modular PCBs plug
onto the motherboard and are accessed
through the front of the enclosure for wiring.
The PCBs available to make up a Weigh II
are:
Standard PCBs —
• Display PCB (mounted on inside of
enclosure door)
• Motherboard PCB with an
RS-232/RS-422/RS-485 serial port
(monitors one vessel)
Optional PCBs —
• 4-channel multivessel PCB; monitors up to
four vessels
• 5-channel or 8-channel Setpoint PCB
• 2-channel, 4-channel, or 8-channel Current
Transmitter PCB (for use only with the AC
power version of the Weigh II)
• Combi-Card PCBs for Setpoint and Current
Transmitter functions, in the following
combinations:
2 Setpoints and 1 Current Output
4 Setpoints and 1 Current Output
4 Setpoints and 2 Current Outputs
• Allen-Bradley RIO PCB
• Profibus DP
• Remote Tare PCB (up to 4 channels)
Sentry™
Vibrations in a vessel can cause changes in
a signal processor’s weight display, even
though no material is moved, because the
vibrations affect the vessel’s structural
response. The Weigh II’s unique Sentry™
feature digitally detects, processes, and
filters those vibrations, reducing the fluctua-
tions in weight readings.
Chapter 1. Weigh II Introduction
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