MT86/MT86HT Flow Meter TROUBLESHOOTING
Fluid Components International LLC 29
6. Remove the meter from the test points. Seal the adjusted potentiometer (R3).
7. Set the calibration test switch to OP, the operate position.
Switch Point Verification Procedure
Switch point relay boards can be located on any of the output buss connectors P7 through P9 and P11. All switch
points are totally independent of each other and may be set to actuate at any flow signal.
1. Connect an appropriate meter to TP13 and TP5 on the main circuit board.
2. Set the calibration switch (SW4) on the main circuit board to the CAL position. See Figure 12.
3. Adjust the CAL potentiometer (R23) on the main circuit board until the test signal level passes through the switch point setting.
Observe the LED to determine exactly where the set point is.
4. If the red LED is lit, within 2% of the full-scale signal range, the set point is properly adjusted. If the set point is out of tolerance, go the
switch point calibration procedure above. If the set point is within tolerance go to the next step.
5. Remove the meter from the test points.
6. Set the calibration test switch to OP, the operate position.
Analog Output Test Procedure
To verify operation of the output modules and related circuitry, a convenient test signal is applied to the analog output. Use this test signal
to sweep through the full signal range (0-10 VDC) and observe operation of the output modules and customer interface circuitry.
1. Place switch SW4 in the CAL (CALibrate) position.
2. Connect a DMM between test point TP13(+) and TP5(-) signal ground.
3 Potentiometer R23 adjusts the test signal level through the full scale 0-10 VDC operating range.
4. Observe the operation of the output modules and the customer interface circuitry.
5. When the testing is complete, return the switch SW4 to the OP (OPerate) position.
Check Procedure for Totalizer and Rate Display
Setting the rate display automatically sets the totalizer.
1. Remove the rate totalizer circuit board from it's mounting position in the cabinet door.
2. Connect the ribbon cable from connector P6 on the MT86 control board to connector P1 on the rate totalizer.
3. Turn the operating power ON.
4. Examine the full scale value of the measured units to be displayed. Set the decimal point on the display to use the highest resolution
available (use as many digits as possible).
The Liquid Crystal Display (LCD) shows six places, however, the right two zeros of the LCD are dummy zeros that
make easier decimal point placement.
5. Select the rate decimal point by installing a jumper to give the decimal point. With the jumper in position number one (far right), there
is no decimal displayed.
6. Set the period jumper for the period of the rate being displayed; SEC, MIN, HR, or DAY.
7. Refer to Table 9 for the correct position of the totalizer decimal point.
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