SMAR LD290, Operation And Maintance Manual

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LD290
– Operation and Maintenance Instruction Manual
1.8
Electronic Housing
The electronic housing can be rotated in order to better position the digital display. To rotate it use the
Housing Rotation Set Screw, see Figure 1.4.
The digital display itself can also be rotated. See Section 4, Figure 4.3.
Wiring
Reach the wiring block by removing the Electrical Connection Cover. This cover can be locked closed
by the cover locking screw (Figure 1.4). To release the cover, rotate the locking screw clockwise.
HOUSING
ROTATION
SCREW
COVER
LOCK
SCREW
Figure 1.4
– Housing Rotating Set Screw
The wiring block has screws on which fork or ring-type terminals can be fastened. See Figure 1.5.
Test terminals allow measuring the current in the 4 - 20 mA loop, without opening it. To measure it,
connect a multimeter in the mA scale in the "

" and "

" terminals.
The wiring block has screws on which fork or ring-type terminals can be fastened. See Figure 1.6.
GROUND
TERMINALS
NOT USED
TEST TERMINALS
Figure 1.5
– Wiring Block
For convenience there are two ground terminals: one inside the cover and one external, located close to
the conduit entries.
Use of twisted pair (22 AWG or greater than) cables is recommended.
Avoid routing signal wiring close to power cables or switching equipment.
The unused outlet connection should be plugged and sealed accordingly. The LD290 is protected
against reverse polarity. However, it will not work in this situation.
The Figure 1.6 shows the correct installation of the conduit, in order to avoid penetration of water, or
other substance, which may cause malfunctioning of the equipment.