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The Support Unit
The support unit contains two 24V, 4A power supplies that provide DC power to the sensor. If the
system is a traversing system, a motor controller will also be installed in the support unit to control the
traversing rail motor. The Power OK light on the front of the support unit indicates that the 24V power
is on and in an acceptable range. The support unit also relays messages and commands between the
sensor and the computer. An isolated RS-232 module is supplied for the PC interface. Various
peripheral devices, such as I/O options and the length counter, are wired through the support unit. An
embedded PC may control the computer.
The choice of mount for the support unit depends on the product being measured and the on-line
environment. The guidelines in Chapter Two, "Installation" and the supplied installation drawing will
help you determine an appropriate location for the support unit. Important factors to consider when
mounting the support unit are:
• The allowable ambient temperature range is 10°C (50° F) to 50° C (122° F).
• The exterior dimensions of the support unit are 24" H x 20" W x 10" D (610 mm x 508 mm x 254
mm).
• The mounting pattern is 25.25" H x 14.0" W (641 mm x 356 mm).
• The mounting hardware should be 3/8", Grade 3 or better.
1-6
Introduction
11/02
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