Vertical Shaft - Water Specialties TR15 Operation And Maintenance Manual

B. If the meter totalizer or indicator-totalizer does work but the
remote instrument does not operate (not receiving proper signal),
then use troubleshooting procedures #2 thru #4 and #8 thru #11.
C. If the meter totalizer or indicator-totalizer and remote instru-
ment do not operate, then use troubleshooting procedures #2 thru
#11.
2. WORKING AREA chosen for testing and inspection of the
internal components should be clean to reduce the chance of dust or
dirt particles being introduced into the transmitter mechanism.
3. TOTALIZER OR INDICATOR-TOTALIZER must be removed from
the transmitter base (#10) and inspected for damage (see section VII
for removal and inspection of the totalizer or section VIII for removal
and inspection of the indicator-totalizer).
4. MOISTURE should not be apparent within the transmitter base
(#11) chamber. 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. DRIVEN CLEVIS SHAFT (#28) should be turning if water is
flowing (above minimum flow rates) through the line. If water is
not flowing through the line, then the transmitter base assembly
(#10) must be removed from the meter head and the driven clevis
shaft (#28) turned by hand. If water is flowing, but the driven clevis
shaft is not turning, then the transmitter base assembly (#10) must
be removed from the meter head and the drive clevis (#35) must be
checked.
6. TRANSMITTER BASE (#10) can be removed by removing the
four transmitter base mounting screws (#37). Lift the unit carefully
off the meter. (Sometimes the transmitter sticks to the meter so
it may be necessary to separate the joint by using a sharp knife or
putty knife as a pry.) Be sure not to damage the transmitter base
(#10) or the clevis (#35). Note: After the transmitter base (#10) has
been removed, the meter assembly should be inspected thoroughly
to be sure it is operating properly (vertical shaft turns when water is
flowing through the line) and is not the cause of the problem (refer
to your meter service manual for instructions on inspection of the
meter).
7. DRIVE CLEVIS (#35) and the drive clevis coupling (#36) should
be checked for damage and checked to be sure they are at the proper
elevation and are engaging properly with the driven clevis shaft (#28)
(see section IV-9). If the clevis (#35) or coupling (#36) is damaged
then they are the likely cause of the problem and must be replaced
(see section IV-9 for installation of new clevis). If the clevis (#35) and
coupling (#36) are adjusted correctly and engaged properly with the
driven clevis shaft (#28) but the meter is not turning them, then the
meter is the likely cause of the problem.
8. SWITCH ACTUATOR (#23) is a black plastic slotted cup located
below the circuit card (#12). The actuator (#23) should be turning
(with water flowing or driven clevis shaft turned by hand) when the
driven clevis shaft (#28) is turning. If the actuator (#23) does not
turn when the driven clevis shaft (#28) turns, then the transmitter
gear train is damaged and must be returned to the factory for repair
(see section XIII for return of transmitter to factory). If the actuator
cam (#23) is turning then the communication lines (#39) and printed
circuit card (#12) should be checked.
9. TRANSMITTER COMMUNICATION LINES (#39) should be
checked to determine the current level flowing in the loop. The
method of measurement is to insert a multi-meter into the 4-20 mA
loop by disconnecting one of the mA signal wires, clipping one side
of meter to disconnected wire and connect other end of multimeter
to the lug or post from which the wire was removed. (mA wires are
red and green.)
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 insure that
the loop is complete. If there is 4.0 mA in the loop when no water is
flowing, then the loop is intact.
If water is flowing through the meter, the current level should be
between 4-20 mA, depending on flow.
10. PRINTED CIRCUIT CARD (#12) should be checked to be sure
it is functioning properly. The circuit card (#12) may be checked as
follows:
WARNING: COVER TOP OF TRANSMITTER SO BRIGHT LIGHT OR
SUNLIGHT DOES NOT INTERFERE WITH NORMAL OPERATION
PRINCIPLES OF OPTIC SWITCH.
A. If the current level in the loop is 0.0 mA, check the voltage
between the mA terminals at the transmitter card. 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, disconnect 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 pos-
sibilities. The card may be starting to fail, but unless there has been
some major damage done to the card (physical impact or voltage
levels above 50 VDC applied), it should not exceed 25.00 mA.
High loop current can also be caused by a short in the trans-
mitter hookup cable. A zero ohm short will cause power sup-
ply fuse to blow. However, it is possible to have a shunt of
about 0.5Ω to 10Ω connecting transmission lines, which
will cause excessive loop current with transmitter in the
system (from 70.0 - 350 mA or more) but when the P. C.
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30119-33 Rev. 1.8/04-14