Overview Of Auma Electrical Connections - AUMA SAEx 07.2 Manual

SAEx 07.2 SAEx 16.2/SAREx 07.2
ACExC 01.2 Intrusive Modbus RTU
Cable installation in ac-
cordance with EMC
Fieldbus cable
6.2.

Overview of AUMA electrical connections

SAREx 16.2 Control unit - electromechanical
For connecting cables exposed to UV radiation (outdoor installation), use UV
resistant cables.
For the connection of position transmitters, screened cables must be used.
Signal and fieldbus cables are susceptible to interference. Motor cables are
interference sources.
Lay cables being susceptible to interference or sources of interference at the
highest possible distance from each other.
The interference immunity of signal and fieldbus cables increases if the cables
are laid close to the earth potential.
If possible, avoid laying long cables and make sure that they are installed in
areas being subject to low interference.
Avoid parallel paths with little cable distance of cables being either susceptible
to interference or interference sources.
Table 17:
Cable recommendation
Only cables complying with the recommendations of EIA-485 specifications should be used for Modbus
wiring.
Impedance
Cable capacity
Wire diameter
Cross section
Loop resistance
Screening
Prior to installation, please note:
Connect maximum 32 devices to one segment.
If more devices are to be connected:
- Connect several segments using repeaters.
Install fieldbus cables at a distance of minimum 20 cm to other cables.
If possible, fieldbus cables should be laid in a separate, conductive, and earthed
cable tray.
Ensure absence of equipotential earth bonding differences between the indi-
vidual devices at fieldbus (perform an equipotential earth bonding).
Table 18: Transmission rate/cable length for line topology
Baud rate (kbit/s) Max. cable length (segment length)
without repeater
9.6 115.2 1,200 m
Table 19: Transmission rate/cable length for loop topology
Baud rate (kbit/s) Max. cable length between actuators
(without repeater)
9.6 115.2 1,200 m
The section below provides an overview of the different electrical connections
described in the chapters to follow.
135 to 165 Ohm, at a measurement frequency between 3 and 20 MHz
< 30 pF per metre
> 0.64 mm
> 0.34 mm², corresponds to AWG 22
< 110 Ohm per km
CU shielding braid or shielding braid and shielding foil
Electrical connection
Possible cable length with repeater
(total network cable length)
Approx. 10 km
Max. possible cable length of redund-
ant loop
Approx. 290 km
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