Page 8
Issue/Rev. 0.2 (7/00)
Electrical Connections
To connect the input power (Figure 4):
24+
24 GND
+5V SIG
SIG GND
LOOP+
LOOP-
NO
NC
C
4-20 mA
Figure 4
Connect 24 Vdc to the unit with the “+” wire going to
the 24+ Terminal and the “-” wire going to the 24 GND
Terminal.
24+
24 GND
+5V SIG
SIG GND
LOOP+
LOOP-
NO
NC
C
4-20 mA
Figure 5
To connect the analog voltage output (Figure 5):
Connect the analog 0 to 5 volts with the “+” on the
5V SIG Terminal and the “-” on the SIG GND Termi-
nal.
Note: This signal tracks the 4-20 mA output and is not
adjustable.
To connect the 4-20 mA analog output as isolated
(Figure 6):
24+
24 GND
+5V SIG
SIG GND
LOOP+
LOOP-
NO
NC
C
4-20 mA
Figure 6
Power Input
24 Volts DC
250 mA
3.6 Watts
+
-
0 to 5 Volt
Analog Output
Signal to Monitoring
Device
+
-
Isolated 4-20 mA Analog Outputs
Isolated
Power
Supply
4-20 mA
Monitoring
Device
+
-
+
-
Connect the “+” terminal of the monitoring equipment
to the Loop ”-” Terminal. Connect the “-” terminal of
the monitoring equipment to the “-” terminal of the
power supply. Connect the “+” terminal of the power
supply to the Loop ”+” Terminal.
To connect the 4-20 mA analog output as non-
isolated (Figure 7): Install a jumper wire from 24V+
to Loop+.
24+
24 GND
+5V SIG
SIG GND
LOOP+
LOOP-
NO
NC
C
4-20 mA
Connect a jumper wire from the 24 “+” Terminal to the
Loop “+” Terminal. Connect the Loop”-” Terminal to
the “+” terminal of the monitoring equipment. Connect
the “-” terminal of the monitoring equipment to the 24
GND Terminal.
Note: The 4-20 mA loop circuit must be powered
as either internal (non-isolated) or external (iso-
lated) or it will not produce the 4-20 mA analog
output.
The SPDT relay is labeled with terminals marked “Re-
lay”.
To connect the 10 Amp SPDT relay (Figure 8):
Figure 7
24+
24 GND
+5V SIG
SIG GND
LOOP+
LOOP-
NO
NC
C
4-20 mA
The Normally-Open Terminal is labeled “NO”, the Nor-
mally-Closed Terminal is labeled “NC”, and the Com-
mon Terminal is labeled “C”.
When the unit is on, the relay is energized and the
connection is made between common (C) and nor-
mally-open (NO). In alarm or bypass conditions,
or power failure, connection is made between com-
mon (C) and normally-closed (NC).
Figure 8
Non-Isolated 4-20mA Analog Outputs
4-20 mA
Monitoring
Device
24 - GND
24+
-
+
COMMON
NORMALLY CLOSED
NORMALLY OPEN
