Logic Testing
The primary function of the PD Tester is to perform a logic test on the
cables or panels. The tester is controlled by an internal industrial
computer with a custom software code and electrical inputs and outputs.
Logic testing is performed by sending a low voltage computer signal
down each of the conductors, and the internal microprocessor examines
how these signals are returned to the computer.
The test signal may be returned on one wire, returned on multiple
wires, or not returned at all. The diagnostic algorithms in the
software examine how all of the test signals are sent out and returned,
and uses this information to identify if the cable is correctly wired,
or if miswired, what the specific miswiring condition caused the
results.
To aid in repairing of miswired cables, the tester's color touch-screen
displays the specific cause of the miswiring in easy to understand
phrases and color-coded messages. A passed test lists the passing
result in a green message for easy identification. Critical miswiring
conditions are displayed in an easy to recognize Red message. Some
miswiring conditions may not be critical (such as phase rotation) and
these can be displayed in yellow (This is a user selectable feature.)
The tester can also present additional information about the cable or
panel, which is displayed in Blue. (This is also a user selectable
feature.)
