Fluid Components International FLT Series - Manual (Page 43)

Doc. No. 06EN003247 Rev. B 5 - 3 FLTÔ Series FlexSwitchÔ
CHAPTER 5 - TROUBLESHOOTING FLUID COMPONENTS INTL
Figure 5-1. Troubleshooting Chart
LED ON
Although the LED is on, it may appear dim. This is caused by the unit being supplied
with 115 Vac and the Input Power Jumper Configuration set to the default setting of
230 Vac.
Input power and the jumper configuration:
OK: See Step 2.
NOT OK: Pull out the control circuit and set the jumpers correctly. Reinstall the
control circuit and restart the system.
LED OFF
Check the Input Power Jumper Configuration setting and verify the input power.
OK: See Step 4
NOT OK: Pull out the control circuit and set the jumpers correctly and verify the input
power. Reinstall the control circuit and restart the system and check for proper
operation. If LED is still off go to Step 4.
LED BLINKING
For Liquid Flow Applications: Line is DRY. Make sure the line is packed.
For Gas Flow Applications: Heater power set too high. Set to lower value.
For Liquid level Applications: Heater power set too high. Set to lower value.
For Liquid Interface Applications: In some cases it is necessary to set the heater power to
the maximum value to achieve the maximum signal difference between the two liquids.
For this application it is normal for the LED to blink if the element goes dry. Go to
Step 2.
Make sure the mode switch is in the “RUN” position.
OK: See Step 3.
Remove the Heater Wattage Control jumper. With a voltmeter measure the signal
voltage at P1 Terminals 1 and 2.
a) The voltage is 0 volts +/- 25 mV: OK,
Reinstall the jumper and wait 5 minutes. Go to c) or d) which ever is applicable.
b) The voltage is out of tolerance: NOT OK,
Make sure that the serial numbers on the control board and the sensing element match.
If the serial numbers are OK then go to the “Restoring Temp Comp Adjustments”
procedure in Appendix D then go to c) or d) which ever is applicable.
c) The Voltage is between 1 and 6 volts and changes with flow or level changes: OK.
See Step 9.
d) The voltage is still about 0 volts: or the voltage is over +/- 7 volts: or the voltage
is negative, between -1 and -6 volts and changes with flow or level
changes: Not OK,
Sensing element may be miswired or is defective. Miswiring is more common on remote
installations at the initial installation. See Step 6 for integral installation, Step 7 for
remote installations.
Measure the voltage at P1 terminals 3 to 4.
Voltage is 0 volts: NOT OK. See Step 5.
Voltage is 9 volts: OK. See Step 6 for integral installation, Step 7 for remote
installations.
1. Is the Yellow LED ON,
OFF or BLINKING
2. Mode Switch
3. Signal Voltage
Observation
4. Power Supply Check