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RANGER - 2150 Digital Indicator Reference Manual Rev 1.1
3.1.
Introduction
The 2150 contains precision electronics and must not be subject to shock, excessive
vibration or extremes of temperature, either before or after installation.
The inputs of the 2150 are protected against electrical interference, but excessive levels of
electro-magnetic radiation and RFI may affect the accuracy and stability of the instrument.
The 2150 should be installed away from any sources of electrical noise. The load cell cable
is particularly sensitive to electrical noise and should be located well away from any power
or switching circuits. For EMC immunity, termination of the load cell shield at the 2150 end
is important (ie. with a sound connection to the 2150 case via the DB9 backshell).
3.2.
Panel Mounting
The simplest way to mount the 2150 is to use the drill template supplied. The template
indicates positions for the drill holes for the two 4mm mounting screws through the panel.
Also displayed on the template is the position of the rectangular hole that should be cut to
allow for the connection of cables and also to display connection instructions. The drill
template supplied with the indicator allows for front or rear machining of the panel.
An optional gasket (P/No 0348) is available for panel mounting installation.
3.3.
DC Power Supply
The DC supply need not be regulated, provided that it is free of excessive electrical noise
and sudden transients. The 2150 can be operated from a high quality plug-pack as long as
there is sufficient capacity to drive both it and the load cells.
Note that the rated voltage of most plug–packs is specified for loads close to but less than
their rated output. If substantially lower loads are used the voltage output rises. Conversely
if the plug pack is run at its maximum load the voltage will drop and it will run very hot.
Typically plug packs with a rating of 9VDC to 12VDC with current outputs of 0.5 to 1A are
fine. The Plug Pack 500mA, option (P/No 0110) is recommended for use with the 2150.
Figure 2: Power Connection
3.4.
Load Cell Signals and Scale Build
Very low output scale bases can be used with the 2150 but may induce some instability in
the weight readings when used with higher resolutions. Generally speaking, the higher the
output, or the lower the number of divisions, the greater the display stability and accuracy.
The 2150 has a milliVolt-per-Volt reading available which can be used to check scale base
signal output levels. For more information refer to SCALE (Scale Base Test Display) page
34.
3.
Installation
Page 8
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