Fluid Components International MT86_MT86HT Manual Troubleshooting User Manual
Page 14
FLUID COMPONENTS INTL
CHAPTER 5 - TROUBLESHOOTING
Models MT86, MT86HT
5 - 14
Doc. No. 003162 Rev. F
Table 5-8. Components for 100 and 1000 Ohm Flowmeters
Input Board Replacement Procedure
Spare input boards MUST be factory pre-adjusted for the specific flowmeter and flow element sensing points. See
Figure 5-5 for the PWB parts placement.
1.
Turn the operating power OFF.
2.
Disconnect the flow element cable from the input board.
3.
Remove the four hold-down screws from the input board being replaced. Grasp the PWB and lift while gently
rocking the board from side to side.
4.
Position new PWB in the same orientation as the old PWB. Gently press down over the connector to seat it.
5.
Install the four hold-down screws in the new PWB.
6.
Reconnect the flow element cables to the PWB. Remove the "HTR+" and "HTR-" wires from the connectors
and continue with the next procedure.
7.
Perform a sensing point balancing procedure. Contact FCI customer service for the appropriate procedure.
8.
When the sensor balancing procedure is completed, seal all adjusted potentiometers.
9.
Turn the operating power OFF. Reconnect the heater circuit wires "HTR+" and "HTR-".
CONTROL BOARD
Adj. Pot.
100 Ohm
1000 Ohm
R8
4.99K, 1%
21.5K, 1%
Gain
20X
10X
INPUT BOARD
Adj. Pot.
100 Ohm
1000 Ohm
R1, R7
6.65K
Not Used
RN3
1K
10K
JUMPERS INSTALLED, INPUT BOARD
Dash No.
100 Ohm
1000 Ohm
OO1
N/A
J1, 2, 4, 6, 7, 8, 10, 12
OO2
N/A
J1, 2, 4, 6
OO3
J3, 5, 9, 11
N/A
OO4
J3, 5
N/A
JUMPERS INSTALLED, OUTPUT BOARD
4-20 mA Output
Jumper
Non Zero-Based
J1, 4
Zero-Based
J1, 5