Potential of customer
connections
All input signals (control inputs) must be supplied with the same potential.
All output signals (status signals) must be supplied with the same potential.
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 cables with a minimum temperature range of +80 °C.
●
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 11:
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 MHz
Impedance
< 30 pF per metre
Cable capacity
> 0.64 mm
Wire diameter
> 0.34 mm², corresponds to AWG 22
Cross section
< 110 Ohm per km
Loop resistance
CU shielding braid or shielding braid and shielding foil
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).
26
SAVEx 07.2 – SAVEx 16.2 / SARVEx 07.2 – SARVEx 16.2 Control unit: electronic (MWG)
Electrical connection
ACVExC 01.2 Non-Intrusive Modbus RTU
