AUMA SAV 07.2 - Page 25

Safety standards
Safety measures and safety equipment must comply with the respectively valid
national on site specifications. All externally connected devices shall comply with
the relevant safety standards for the place of installation.
Connecting cables
●
We recommend using connecting cables and connecting terminals according
to rated current (I
N
) (refer to motor name plate or electrical data sheet).
●
For device insulation, appropriate (voltage-proof) cables must be used. Specify
cables for the highest occurring rated voltage.
●
Use connecting cable with appropriate minimum rated temperature.
●
For connecting cables exposed to UV radiation (outdoor installation), use UV
resistant cables.
●
For the connection of position transmitters, screened cables must be used.
Cable installation in ac-
cordance with EMC
Signal and fieldbus cables are susceptible to interference. Motor cables are
interference sources.
This product potentially causes high frequency interference!
→
The measures eliminating interference described hereafter must be observed
for cable installation in accordance with EMC.
●
Use shielded power cable and earth shield at both ends.
●
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.
●
In a residential environment, this product may cause radio interference, in which
case supplementary mitigation measures might be required.
Fieldbus cable
Table 10:
Cable recommendation
Only cables complying with the recommendations of EIA 485 specifications should be used for Modbus
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:
- 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).
25
SAV 07.2 – SAV 16.2 / SARV 07.2 – SARV 16.2 Control unit: electronic (MWG)
ACV 01.2 Modbus RTU Electrical connection