FLT
®
Series FlexSwitch
TM
TROUBLESHOOTING
Fluid Components International LLC 39
5 TROUBLESHOOTING
Warning:
Only qualified personnel should attempt to test this instrument. The operator assumes all responsibilities for safe practices
while troubleshooting.
Caution:
The control circuit contains electrostatic discharge (ESD) sensitive devices. Use standard ESD precautions when handling the
control circuit. See Section 2, Operation, for ESD details.
Tools Needed
Digital Multimeter (DMM)
3 Slotted Screwdrivers - 3/32” (2 mm); 1/8” (3 mm); 1/4” (6 mm)
Small Phillips head screwdriver
Quick Check
• Verify that the control circuit is seated firmly in the terminal board socket.
• Verify that LED DS3 (yellow LED) is on when power is applied.
• If LED DS3 flashes the heater power is set too high for most applications.
• Ensure that the jumpers are in the correct position. See Section 3 for the correct positions. Check input power.
• Ensure that the Mode switch is in the RUN position (switch S1 positioned toward the heat sink).
• Check any customer supplied fuses or disconnects.
• See the troubleshooting chart in Figure 5-1 at the end of this section.
Non-maintenance Observations
At this point, 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 sensing element and the control circuit are the same number. The sensing element and the control circuit
are a matched set and cannot be operated independently of each other. The exception to this is if a removal and replacement have been done
for repair purposes. All calibrations and jumpers must have been done and set.
Check Input Power
Verify that the correct power source is turned on and connected. Verify that the correct power jumper is installed and the power wiring is
correct for the application. See Section 3 for the correct positions.
Check the Instrument Installation
Review the information on instrument installation in Section 2 to verify correct mechanical and electrical installation.
Check for Moisture
Check for moisture on the control circuit, whether in the local sensor enclosure (integral) or remote control circuit enclosure (remote). Mois-
ture on the control circuit may cause intermittent operation.
Check Application Design Requirements
Application design problems may occur with first time application instruments, although the design should also be checked on instruments
that have been in operation for some time. If the application design does not match field conditions, errors occur.
1. Review the application design with plant operation personnel and plant engineers.
2. Ensure that plant equipment such as pressure and temperature instruments conform to the actual conditions.
3. Verify operating temperature, operating pressure, line size, and process medium.
If conditions and specifications are satisfactory, then refer to the troubleshooting chart in the back of this section for troubleshooting
suggestions.
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