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Chapter 3 – Installation
Wiring
Terminal
designations
3-2
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See the Hardware Manual of the drive for cable routing
information.
Arrange the bus cables as far away from the motor
cables as possible. Avoid parallel runs. Use bushings at
cable entries.
The terminal block (X1) on the RMBA-01 is of the
detachable type for easy connection.
The Modbus cable shield may be directly earthed at
one node only. At other nodes, the cable shield should
be earthed via an RC circuit.
Figure 3-1 RMBA-01 terminal designations
X1
Marking
1
A
Data negative (Conductor 1 in twisted pair).
2
B
Data positive (Conductor 2 in twisted pair).
Data ground (Conductor 3 in a three-wire
system). Used in a three-wire system as a
common reference potential for all devices on
3
DG
the bus. Three-wire connection is highly
recommended as it improves noise immunity.
See the wiring diagrams below.
Modbus cable shield AC earthing (via an RC
4
SHLD
circuit to the frame).
X1
1 2 3 4
Bus termination switch (S1)
Description
RMBA-01 User's manual
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