Fluid Components International MT91 Manual Troubleshooting - Manual

Doc. No. 003185 Rev. B 5 - 1 Model MT91 Multipoint Flowmeter
CHAPTER 5 - TROUBLESHOOTING FLUID COMPONENTS INTL
5. Troubleshooting
Warning: Only qualified personnel should attempt to test this device. The operator assumes all
responsibilities for safe practices while troubleshooting.
Caution: The flow transmitter contains electrostatic discharge (ESD) sensitive devices. Use standard ESD
precautions when handling the flow transmitter. See Chapter 2, Installation for ESD details.
Quick Check
Use Table 5-1 as a quick check of problems and solutions. More in-depth discussions follow this table.
Table 5-1. Quick Check Troubleshooting
Problem Solution
No Display Check fuses. Verify correct power is applied.
Verify the ribbon cable between the backplane board J18 and the display J1 is
solidly connected and the red stripe is at pin 1. See Figures 2-3 and 2-4.
No Display or Dim Display Adjust potentiometer R1 (located on display board) clockwise (10 turns
maximum) until display appears. See Figures 2-3.
Display is locked up Cycle the input power or press any key for more than 10 seconds.
Incorrect Readings Verify that all ribbon cables are firmly seated. See Figure 2-3 and 2-4.
Non-maintenance Observations
At this point, simply observe the system setup to verify operation. No disassembly or testing is required at this time.
Check Serial Numbers
Verify that the serial number of the flow elements and the flow transmitter are the same. The flow elements and the
flow transmitter are a matched set and cannot be operated independently of each other.
Check Input Power
Verify that the correct power source is turned on and connected.
Check the Unit Installation
Review the information on instrument installation in Chapter 2 to verify correct mechanical and electrical
installation. Verify that all ribbon cables are seated firmly.
Relay Output Board J1 Þ Backplane Board J21 and/or J22
Analog Output Board J1 Þ Backplane Board J19
Display Board J1 Þ Backplane Board J18
Check for Moisture
Check for moisture on the flow transmitter. Moisture on the flow transmitter may cause intermittent operation.