Fluid Components International FLT93 Nuclear - Manual (Page 43)

FLT ® Series FlexSwitch TM TROUBLESHOOTING
Fluid Components International LLC 43
Troubleshooting the Flow Transmitter
With power applied measure 9 volts DC ±2% (8 to 10 volts) from Plug P1 Pin 1 to Pin 4. See Figure 3-2 for the location of P1.
1 Is the Yellow LED ON, OFF or BLINKING LED ON
Although the LED is on, it may appear dim. This is usually caused by the unit being
supplied with 115 Vac and the Input Power Jumper Confi guration set to the default
setting of 230 Vac.
Check Input power and the input power jumper confi guration:
OK: See Step 2.
NOT OK: Supply power will need to be changed to work with the control circuit or
the control circuit must be returned to FCI for reconfi guration.
LED OFF
Check the Input Power Jumper Confi guration setting and verify the input power.
OK: See Step 4
NOT OK: Supply power will need to be changed to work with the control circuit or
the control circuit must be returned to FCI for reconfi guration. 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.
2 Mode Switch Make sure the mode switch is in the “RUN” position.
OK: See Step 3.
3 Signal Voltage Observation 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 Adjust-
ments” procedure in Appendix C then go to c) or d) which ever is applicable.
c) The Voltage is between 0.1 and 6 volts and changes with fl ow 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 fl ow 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.
4 Power Supply Check Measure the voltage at P1 terminals 2 to 4.
Voltage is 9 volts ± .2V: OK. See Step 6 for integral installation, Step 7 for
remote installations.
NOT OK. See Step 5.