Cable installation in ac-
cordance with EMC
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.
Fieldbus cable
Table 14:
Cable recommendation
Only cables complying with IEC 61158 or IEC 61784, cable type A, may be used for Profibus DP wiring.
135 to 165 Ohm, at a measurement frequency between 3 and 20 MHzImpedance
< 30 pF per metreCable capacity
> 0.64 mmWire diameter
> 0.34 mm², corresponds to AWG 22Cross section
< 110 Ohm per kmLoop resistance
CU shielding braid or shielding braid and shielding foilScreening
Prior to installation, please note:
●
Connect maximum 32 devices to one segment.
●
If more devices are to be connected:
- Allot devices to different segments.
- Connect 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).
1,500500187.5≥ 93.75Baud rate [kbit/s]
2004001,0001,200Maximum segment length [m]
6.2. Overview of AUMA electrical connections
The section below provides an overview of the different electrical connections
described in the chapters to follow.
24
SQEx 05.2 – SQEx 14.2/SQREx 05.2 – SQREx 14.2 Control unit: electronic (MWG)
Electrical connection ACExC 01.2 Non-Intrusive Profibus DP
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