Data Industrial 340LW Series Manuel du propriétaire - Page 3

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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.

Sample Power Supply Wiring

Diagram

AC or DC

Power Supply

DC -

AC Common

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.

DC +

Earth

AC Load

Ground

DIC

AC L/DC+

Comm

To ON

ORKS

Network

Port

AC C/DC-

FTT-10A

Comm

ORKS

Data Industrial

Side View - Typical 300 Series

Removable Connector Wiring

3/32" Flathead

Screwdriver

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

Series 340LW Owner's

Wire

Series 300

Connector

Manual