Fox Thermal FT3 - Alarm Wiring

4-20
FLOW
TS4
24V
OUT
4-20
#2
Red 1
Red2
Yel 3
Wh 4
Wh 5
PULSE
/ALM
TS2
TS1
F1
J2
1
24V, 0.75A
2 3
IN
+1
+1 -2
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
+24VDC
4 to 20mA FLOW RATE
24VDC Return
Customer PLC or DCSFT3
21 mA
20 mA
4 mA
3.6 mA
0 mA
NAMUR
Alarm
Range
NAMUR
Alarm
Range
Working Range
Normal Operation
Setting Up the NE-43 Alarms
The FT3 ow meter supports the NAMUR specication NE-43 for alarms on the 4-20mA output. See p.
55 for the 4-20mA ouput NAMUR operation.
CAUTION! Congure the FT3 with the following setup when using the 4-20mA output to
control equipment in a failsafe application.
4-20mA Failsafe Wiring: NAMUR NE-43
When the 4-20mA output is used to control equipment in failsafe applications:
• Wire the 4-20mA output in series with the Alarm output as shown in Fig. 3.7.
• Congure the Pulse/Alarm output to Alarm and select System Alarm as shown in the "Alarm
Output" on Page 58.
The System Alarm output is designed to allow current to ow during normal operation and interrupts
current when power to the meter is lost or in a System Alarm condition.
In the 4-20mA Failsafe Wiring conguration of Fig. 3.7, the 4-20mA signal goes to 0mA if power to
the FT3 is lost or a System Alarm occurs.
Fig. 3.7: 4-20mA Failsafe Wiring and Range of 4-20mA Output for NAMUR Alarm
Wiring | 40
Model FT3
Wiring