30119-41 Rev. 1.6/02-07
5
REPROGRAMMING:
The bonnet can be lifted enough
to slide the base cup and digital transmitter out of the
bonnet, allowing access to the programming buttons.
(See Programming Guide, Literature #30110-17.)
3. SENSOR ASSEMBLY
in the meter can be re-
placed by following the meter instruction manual.
4. BATTERY REPLACEMENT (#6):
The 3 Volt
Lithium Battery is used as a backup to the 24 VDC loop
power. In the event of a power loss, the battery will
continue to operate the rate and total functions of the
TR28-2. The “low battery” indication will appear ap-
proximately 6 months prior to expiration.
A.
The bonnet (#1) can be lifted enough to ac-
cess the terminals connected to sensor input and trans-
mitter pulse/mA output.
B
.
Carefully disconnect the wires from the
transmitter. The unit can then be turned over and the
battery can be accessed through the opening in the
bottom of the base cup. Be sure to install the new
battery with the positive (+) and negative (-) terminals
positioned properly.
C.
Reconnect the wires to the transmitter. (See
page 9.)
D.
Reinsert the TR28-2 (#4) into the bonnet as-
sembly (#1) with the
top of dial aligned with the
hinge side of the bonnet
.
E.
Install the bonnet O-ring (#2) into bonnet
with a coating of silicone grease.
NOTE: Batteries should be disposed of in an envi-
ronmentally sound manner.
IX. TROUBLESHOOTING
the transmitter is necessary if it
is apparent that the instrument being controlled by the
transmitter is not receiving a proper signal from the
transmitter, and/or the totalizer or indicator-totalizer is
not functioning. Before beginning, it is important to be
sure that the problem is with the transmitter.
The following checks should be made:
1)
Check to be sure that water is flowing through the
meter at flows above the minimum flow rate for the
given size meter.
2)
Check the instrument to be sure it has the required
power being supplied to it.
3)
Check the junction box to be sure the communica-
tion lines from the transmitter to the instrument are
making good contact and that the transmitter is wired
properly to the instrument. (See wiring diagrams on
page 8, 10 or 11.)
1. THE TROUBLESHOOTING GUIDE
is provided to
help isolate any problem that may occur with the trans-
mitter. Follow the instructions and test procedures
listed for each problem.
NOTE
:
The meter assembly should be inspected
thoroughly to be sure it is operating properly and is not
the cause of the problem. (Refer to your meter service
manual for instruction on inspection of the meter.)
A.
If the meter indicator-totalizer
does
work, but
the remote instrument
does not
operate (not receiving
proper signal), and if the 24 VDC loop power to the
Model TR28-2 is now on, then use troubleshooting pro-
cedures 2, 3, 5, 6, X, XI and XII.
B.
If the meter indicator-totalizer and remote in-
strument
do not
operate, check the TR28-2 by opening
and closing the lid twice. If no response, then follow all
procedures.
2. WORKING AREA
chosen for testing and inspec-
tion of the internal components should be clean to re-
duce the chance of dust or dirt particles being intro-
duced into the transmitter mechanism.
3. TR28-2 DIGITAL TRANSMITTER
must be re-
moved from the mounting base (#10) to gain access to
the transmitter terminals and to check connections.
Remove the unit from the mounting base following in-
structions in section VIII. Check the connection from
the sensor in the meter to the terminals in the bottom
of the TR28-2. Check the connection from the pulse
and mA terminals on the TR28-2 to the instrument.
Make sure the connection is clean and tight, and that
the terminal is secure.
4. MOISTURE
should not be apparent within the
transmitter bonnet (#1). All O-rings should be inspected
for breaks or presence of foreign materials that allow
leakage to occur. Check to be sure water is not coming
up through the meter head. If water is coming up
through the meter head then the meter should be
checked. (See meter service manual.)
5. TRANSMITTER COMMUNICATION LINES (#13)
should be checked to determine the current level flow-
ing in the loop. The method of measurement is to insert
a multimeter into the 4-20 mA loop by disconnecting
one of the mA signal wires, clipping one side of multi-
meter to disconnected wire and connecting other end of
multi-meter to the lug or post from which the wire was
removed.
A. If no water is flowing
through the meter,
the current level should be 4.0 mA. The purpose of the
4.0 mA at no flow is to ensure that the loop is com-
plete. If there is 4.0 mA in the loop when no water is
flowing, then the loop is intact.
B. If water is flowing
through the meter, the
current level should be between 4 and 20 mA, depend-
ing on flow.
6. TR28-2 CIRCUIT
should be checked to be sure it
is functioning properly. The circuit may be checked as
follows:
A.
If the current level in the loop is 0.0 mA,
check the voltage between the mA terminals at the
transmitter. It should be at the maximum power supply
level (± 1.0 VDC).
If there is no voltage present, then check the loop
voltage at its source. If there is voltage at the voltage
source, then there is an opening in the loop.
If there is no voltage at the power supply, discon-
nect loop and check supply by itself. If the voltage level
is still 0 VDC or very low (<10 VDC), replace power
supply.
B.
If the level of current is greater than 20 mA,
there are two possibilities. The TR28-2 may be starting
to fail, but unless there has been some major damage
done to the unit (physical impact or voltage levels above
