
LevelMaster 7100 User manual 2105835 Rev AA |
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IMPORTANT NOTES:
Configure RS-485 termination according to the position of the LevelMaster on the RS-485
bus:
If it is the last unit, ensure that it is configured to terminate the RS-485 bus. See section 5.3.2,
.
If it is an intermediate unit, ensure that it is configured as an intermediate sensor (factory default).
For legacy boards (part number 2018546-005), terminate as described in section 4.1.3,
Onboard termination
.
Wiring for power
CAUTION - Equipment damage.
Other than the wire for 12 Vdc ground, do not connect any ground wire or shield
from the cable or any other source to the board. The LevelMaster must float above ground potential.
To wire the additional LevelMaster for power:
1.
Remove the 2-position terminal connector from the POWER port on the additional LevelMaster.
2.
Loosen the screws on the power connector.
3.
Insert the wires in the power connector, observing correct polarity (see Figure 24, Figure 25, Figure 26, and Figure 27 for
sample wiring).
a.
If the additional LevelMaster is the last unit on the bus, insert the power wires from the first LevelMaster in the power
(+, -) positions. Secure the wires by tightening the screws for each terminal position wired.
b.
If the additional LevelMaster is an intermediate unit on the bus (additional units will be connected):
i.
Insert power wires from the first LevelMaster in the (+, -) positions and leave screews loosen to insert the wires
from the next LevelMaster.
ii.
Insert power wires from the next LevelMaster in the (+, -) positions.
iii.
Secure both pairs of power wires by tightening the screws for each terminal connector position.
4.
Proceed to complete wiring.
a.
For general-purpose locations, proceed to section 4.5.1,
b.
For hazardous locations, proceed to section 4.5.2,
Examples of multi-unit bus wiring
Figure 24, Figure 25, Figure 26, and Figure 27 display different connections for multi-unit installations.
Figure 24 displays a two-LevelMaster bus with boards of the same type. The board of an additional LevelMaster is connected to
the board of the first LevelMaster of the RS-485 bus. The power connection for the additional LevelMaster is through the power
port on the first LevelMaster. The communication connection is through the additional connection pair on the RS-485 port on the
first LevelMaster. The first LevelMaster is an intermediate node. The additional LevelMaster is last on the bus and must be
configured to terminate the bus.
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