Fluid Components International FLT93 Nuclear - Manual (Page 41)

FLT ® Series FlexSwitch TM TROUBLESHOOTING
Fluid Components International LLC 41
5 TROUBLESHOOTING
Warning: Only qualifi ed 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 Chapter 2, Operation, for ESD details.
Tools Needed
Digital Multimeter (DMM)
Small standard screwdriver
Small phillips head screwdriver
Quick Check
• Verify that the control circuit is seated fi rmly.
• LED DS3 should be lit when power is applied and in most cases it should not be blinking.
• Ensure that the jumpers are in the correct position. See Chapter 3 for the correct positions.
(The power is factory preset for 220 Vac, the customer may need to reset jumpers for other power input.)
• Ensure that the CALIBRATE - RUN switch is in the RUN position (switch S1 positioned toward the heat sink).
• If LED DS3 fl ashes the heater power is set to high for most applications.
• Check any customer supplied fuses.
• See the troubleshooting chart in Figure 5-1 at the end of this chapter.
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 power jumpers are correct for the application. See Chapter 3
for the correct positions.
Check the Instrument Installation
Review the information on instrument installation in Chapter 2 to verify correct mechanical and electrical installation.
Check for Moisture
Check for moisture on the control circuit or in the sensor , or control circuit enclosure. Moisture on the control circuit may cause intermittent
operation.
Check Application Design Requirements
Application design problems may occur with fi rst 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 fi eld 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.