SMAR LD291, Operation And Maintenance Instruction Manual

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LD291 - Operation and Maintenance Instruction Manual
1.10
CORRECT
WIRES
INCORRECT
Figure 1.6 - Conduit Installation
Loop Conections
Connection of the LD291 should be done as in Figure 1.7. Connection in multi-drop configuration
should be done as in Figure 1.8. Note that a maximum of 15 transmitters can be connected on the
same line and that they should be connected in parallel.
Take care to the power supply as well, when many transmitters are connected on the same line. The
current through the 250 Ohm resistor will be high causing a high voltage drop. Therefore make sure
that the power supply voltage is sufficient.
The configuration can be connected to the communication terminals of the transmitter or at any point of
the signal line by using the alligator clips. It is also recommended to ground the shield of shielded
cables at only one end. The ungrounded end must be carefully isolated.
250
SIGNAL LOOP BE GROUNDED AT ANY
POINT OR LEFT UNGROUND
CONFIGURATOR
POWER
SUPPLY
Figure 1.7 – Wiring Diagram for the LD291
POWER
SUPPLY
1 13 14 15*
CONFIGURATOR
250
Figure 1.8 – Wiring Diagram for the LD291 in Multidrop Configuration