Fluid Components International FLT Series Rack Mount User Manual
Page 41
FLUID COMPONENTS INTL
CHAPTER 3 - OPERATION
FLT
Series FlexSwitch
Rack Mount
3 - 6
Doc. No. 06EN003250 Rev. N/C
Note: The calculated set point must be at least 0.020 volts greater than the normal signal to ensure that the
alarm will reset.
e)
Slide the mode switch to the CAL position.
f)
Adjust the CAL potentiometer R27 (below the mode switch) until the voltmeter equals the calculated
set point.
g)
For the appropriate alarm, determine whether the status LED is on or off (red for alarm 1 or green for
alarm 2).
1)
If the LED is off, turn the alarm set point adjustment potentiometer (R30 for alarm 1 or R29
for alarm 2) slowly clockwise just until the LED turns on.
2)
If the LED is on, turn the set point adjustment potentiometer (R30 for alarm 1 or R25 for
alarm 2) counterclockwise until the LED turns off and then slowly clockwise just until the
LED turns on.
Detecting Increasing Flow (high flow alarm)
a)
Establish the excessive process flow condition and allow the signal to stabilize.
b)
Record the high flow signal. (The high flow signal should be less than the normal flow signal.)
High Flow Signal = ________ volts DC
c)
Determine the set point by calculating the arithmetic mean of the normal and high flow output signals.
(i.e., If the normal signal is 2.000 volts and the high flow signal is 1.000 volts, then the calculated set
point would be 1.500 volts.)
d)
Record this value.
Calculated Set Point = ________ volts DC
Note: The calculated set point must be at least 0.020 volts less than the normal signal to ensure that the alarm
will reset.
e)
Slide the mode switch to the CAL position.
f)
Adjust the CAL potentiometer (R27) until the voltmeter equals the calculated set point.
g)
For the appropriate alarm, determine whether the status LED is on or off (red for alarm 1 or green for
alarm 2).
1)
If the LED is on, turn the set point adjustment potentiometer (R30 for alarm 1 or R29 for
alarm 2) slowly counterclockwise just until the LED turns off.
2)
If the LED is off, turn the set point adjustment potentiometer (R30 for alarm 1 or R29 for
alarm 2) clockwise until the LED turns on and then slowly counterclockwise just until the
LED turns off.
8.
Slide the mode switch to the RUN position.
9.
Establish the normal process flow condition. For low-flow alarm setups, the status LED should be off. For high
flow alarm setups, the status LED should be on.
10. Establish the process alarm condition and monitor the voltmeter display.
11. When the output signal passes through the calculated set point value, the status LED should turn on for low-flow
alarms, off for high flow alarms, and the relay contacts should switch.
12. Reestablish the normal process flow condition. Both the LED and the relay contacts should reset.
13. Disconnect the voltmeter from P1 or P2.