Fluid Components International FLT Series - Manual (Page 38)

FLUID COMPONENTS INTL CHAPTER 3 - OPERATION
FLTÔ Series FlexSwitchÔ 3 - 20 Doc. No. 06EN003246 Rev. B
Fail Safe Alarm Setting
These procedures set the second relay to detect component failure (fail-safe).
Low Flow Alarm Settings
For the low flow fail safe setup the following jumpers are to be installed: J18, J20, J23, J24, J27.
Figure 3-5. Low Flow Fail Safe Alarm
High Flow Alarm Settings
For the high flow fail safe setup the following jumpers are to be installed: J18, J20, J23, J25, J26.
Figure 3-6. High Flow Fail Safe Alarm
The following information is assumed:
Relay is de-energized in the ALARM condition.
Alarm 1 set point is adjusted for desired high flow alarm velocity or signal.
Alarm 2 set point is adjusted above maximum signal output (under range flow not to exceed 7.0 volts).
The following information is assumed:
Relay is de-energized in the ALARM condition.
Alarm 1 set point is adjusted for desired low flow alarm velocity or signal.
Alarm 2 set point is adjusted slightly below minimum signal output (over range flow).
0.5
0 2 0 1 0 3 0 5 0 4 0 6 0
1.0
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
W H E N A L A R M 1 D E T E C T S L O W
F L O W T H E R E I S A P O S S I B L E O P E N
A C T I V E R T D O R S H O R T E D
R E F E R E N C E R T D
W H E N A L A R M 2 D E T E C T S O V E R
R A N G E F L O W , T H E R E I S A P O S S I B L E
H E A T E R F A I L U R E ,
S H O R T E D A C T I V E R T D O R
O P E N R E F E R E N C E R T D
SIGNAL
O U T P U T
AIR FLOW RATE
A L A R M 1 S E T P O I N T
A L A R M 2 S E T P O I N T
D E - E N E R G I Z E D
D E - E N E R G I Z E D
E N E R G I Z E D
E N E R G I Z E D
C00534-1
A P O W E R F A I L U R E I S D E T E C T E D I F
B O T H R E L A Y S A R E D E - E N E R G I Z E D
0 . 5
0 2 0 1 0 3 0 5 0 4 0 6 0
1 . 0
0
1 . 5
2 . 0
2 . 5
3 . 0
3 . 5
4 . 0
4 . 5
5 . 0
W H E N A L A R M 2 D E T E C T S A N
U N D E R R A N G E F L O W , T H E R E I S A
P O S S I B L E O P E N A C T I V E R T D O R
S H O R T E D R E F E R E N C E R T D
W H E N A L A R M 1 D E T E C T S H I G H
F L O W , T H E R E I S A P O S S I B L E
H E A T E R F A I L U R E ,
S H O R T E D A C T I V E R T D O R
O P E N R E F E R E N C E R T D
SIGNAL
OUTPUT
AIR FLOW RATE
A L A R M 2 S E T P O I N T
A L A R M 1 S E T P O I N T
D E - E N E R G I Z E D
D E - E N E R G I Z E D
E N E R G I Z E D
E N E R G I Z E D
C 0 0 5 3 5 - 1
A P O W E R F A I L U R E I S D E T E C T E D I F
B O T H R E L A Y S A R E D E - E N E R G I Z E D