CiDRA SONARtrac HD GVF-100 - Manual (Page 94)

Copyright © 2006 CiDRA Corporation Page 10-16
20675-02 Rev 01
In previous figure the sensor band failed the test. Sensor 1 and 2 are
either mis-wired between their terminals or reversed (wht to blk).
Sensor 7 is disconnected (open circuit).
If an error is noted when the sensor test is first run, repeat the test to
confirm the fault.
If the error occurs at first power up, verify wiring termination at the
transmitter terminal block. If a ‘disconnect’ error is seen after a
system has been in service, verify the sensor to transmitter cable is
not damaged or that a wire in the transmitter has not loosened from its
terminal block.
•
4–20 Test –
Allows the user to send out discrete milliamp signals from 4-20mA
Output #1 and #2 to the control system. Settable in one milliamp
increments.
•
Gain
The sensor pre-amplifier is located within the sensor cover. The
electronic ‘Gain’ (amplification) applied to the sensor outputs can be
accessed through the transmitter ‘Diagnostics’ menu. Transmitter
based gain control functions are provided through three sub-menus –
‘AUTOSET GAIN’, ‘CHECK/SET GAIN’, and ‘TEST GAIN’. Gain
adjustments should be made to the system when the process is
operating “normally”.
‘AUTOSET GAIN’ performs an automatic test and adjustment of the
pre-amplifier gain setting. It automatically cycles through the pre-
determined gain settings in order to find the optimal gain setting based
on the flow conditions at that time. AUTOSET GAIN should be run
while the process is operating at normal conditions to avoid making an
incorrect gain setting.
‘CHECK/SET GAIN’ enables the user to check the current gain setting
in the pre-amplifier and to manually set it to one of four user settings
1, 4.65, 21.55, and 98.65.
‘TEST GAIN’ performs a test of the system electronics to determine if
the gain setting is optimal.
•
Self Test
‘PASS/FAIL’ test performed on the system RAM and DPRAM (internal
memory).
•
Keyboard Test
Tests the function of each of the keyboard keys. The alarm LED will
light for each key pressed to indicate the test is in progress.