CiDRA SONARtrac PW VF-100 - Manual (Page 264)

20838-01 Rev 09 Page J-5
System Faults (page 4):
Item
No
PROBLEM
POSSIBLE
CAUSE DIAGNOSTIC
METHOD
DIAGNOSTIC RESULT COMMENTS
8
The 4 –20mA
display in
control room
does not
match the
flow rate on
the meter
Wrong Range
settings at transmitter
or DCS
Verify the range settings
are the same
Yes - Ranges of transmitter
and DCS are the same
See below if problem persists
No – range settings are
different
Re-range the DCS or the
transmitter
The transmitter
output trim needs to
be adjusted
Scroll to ‘4mA TRIM’ in the
4-20 mA CH 1(2) submenu
under the OUTPUT
CONFIG menu in order to
access trim function. Press
ENTER and follow
instructions
Yes – the output is correct See below
No – the output needs to be
adjusted
Input values per transmitter screen
values. If problem persists see
below
Signal is being
affected by PLC card
Disconnect input signal
lines from PLC card.
Connect current meter to
leads. Output discrete mA
signals using ‘4-20mA
TEST’ under the
DIAGNOSTIC menu. Yes – the current meter
readings match the
transmitter output values
A 4-20mA signal isolator may be
required. Contact Customer
Support.
No – the current readings do
not match the transmitter
values See below
The 4-20mA values
generated by the
transmitter in ‘4-
20mA Test’ do not
match the signals
seen at the end of the
signal cable
Connect current meter at
the 4-20mA terminals in the
transmitter and output
discrete signals using ‘4-
20mA Test’
Yes - the signals output from
the transmitter match the
current meter readings
Plant wiring may have a problem.
Verify integrity of signal wires.
No – the output from the
meter does not match the
current meter readings Contact Customer Support.