Data Industrial Series 340LW Owner’s Manual
3
C L/DC
+
C C/DC
-
mm LW
ON ORKS
®
To ON ORKS
Network
FTT-10A
LW
®
DIC
Comm
Port
DC +
or
AC Load
DC -
or
AC Common
Earth
Ground
AC or DC
Power Supply
Temperature Sensor Installation
The location of the temperature sensors with regard to the flow
sensor is important for the accuracy of the energy calculation.
Temperature sensor T1 must be located closest to the flow sensor.
A distance of 5 pipe diameters will give the greatest accuracy.
Always install the temperature sensor downstream of the flow
sensor.
Electrical Installation
All connections to the 340LW are made to screw terminals on
removable headers.
Power Supply Wiring
The Series 340LW requires 12-24 Volts AC or DC to operate. The power connections are made to the
ORANGE header. The connections are labeled beside the header. Observe the polarity shown on the label.
When powered with AC power provided by a
transformer secondary the 340LW causes DC current to
flow in the transformer secondary. When several
340LWs are powered in parallel by the same
transformer secondary, the currents will add and a
sufficient secondary DC current may flow to cause
transformer core saturation. Improper operation may
result. When powering multiple 340LWs, a DC power
supply with appropriate output capability should be used
to prevent this situation. For instance, 16 340LWs will
require 16 x 70mA = 1120mA. A 1.5 Amp, 12-24 Volt DC
power supply would handle such a load.
When operating a 340LW from AC power, one
side of the AC voltage source should be grounded to
earth ground. This grounded AC source side should be
connected to the 340LW “ACC/DC-” power input terminal, the other side being connected to the 340LW
“ACL/DC+” terminal. (This arrangement is like that in normal 110 VAC power, which has a “neutral” or
common side and a “hot” or line side.
For optimal noise immunity and when operating the 340LW with a “Zero threshold, sine wave” flow
sensor, the ground lug on the 340LW should be connected to earth ground.
If a Data Industrial plug in type power supply
(A-1026 or A-503) is used, connect the black/white striped wire to the terminal marked positive (+) and the
black wire to the terminal marked negative (-).
Note:
Included with every Series 340LW is a 340LWIK kit containing a screw, lockwasher and ground lead
to connect the Series 340LW to Earth Ground. Connect the Earth Ground Lug of the Series 340LW
to a solid Earth Ground with as short a wire as possible. This will help prevent electrical
interference from affecting the Series 340LW’s normal operation.
Side View - Typical 300 Series
Removable Connector Wiring
3/32” Flathead
Screwdriver
Series 300
Connector
Wire
Sample Power Supply Wiring
Diagram
