Device Description MV4-570-TA1/2, MV4-590-TA1/2 2-20
Moeller 07/01 AWB-C2700-1347GB
b) Installation of the units with a stainless steel front
Special care should be taken during mounting to ensure correct sealing to IP 65.
1. Slide the front seal from the rear over the unit cover onto the fixing bolts.
2. Place the device from the front into the housing cutout.
3. The front seal must be make flat and uniform contact between the front plate and front cover.
4. The nuts must be uniformly and securely tightened.
5. Ensure correct positioning and application of even pressure of the front seal.
Pay close attention to the mounting instructions (refer to section 6.1).
12.3 Preparation of the connection cables (EMC)
The preparation of the data and signal cables is an important factor in the electromagnetic compatibility
(EMC) of the Touch Operator Panel, both in terms of interference immunity and emission.
The EMC values stated in the technical data can only be guaranteed if the cables are prepared
according to the following specifications.
All data cables on the Touch Operator Panel (System Port) and on the modules in the slots (Slot 0 and
Slot 1) must be shielded unless unshielded wiring is expressly stipulated. The power supply cable is not
shielded.
The cable shield must be made from copper braid. Only use a metal or metallised connector casing. Connect
the cable shield directly to the low-impedance connector casing on the Touch Operator Panel. This ensures
that the cable screen is properly connected to the housing of the device via the screws and the protective
metal shroud of the plug connector (low-impedance).
Cables must also be shielded if they are disconnected at the other end or are only connected during
commissioning or servicing.
Refer to the relevant operating instructions of the PLC manufacturer for the correct connection procedure for
the cable shield at the other end. Unless otherwise stated, connect the cable shield to the metal or metallised
connector casing on the PLC.
Avoid leaving the shield open. The data connections to be shielded involve the high-speed transfer of digital
signals between two active systems. The cable shield only functions against asymmetrical interference
transients if the shield is connected to the device earths (usually metallic device casing) at both ends.
Provide a potential equalisation cable with a suitable cross-section between potentials (control cabinets) if
the Touch Operator Panel and the communication partner are installed in different control cabinets or at
different PE potentials (zero conductor potentials), and if the cable shield is directly or indirectly connected at
both ends to the protective earth conductor. This will prevent the occurrence of excessive compensation
currents on the shield and shield connections, as may occur in the event of a possible shorting of a device
on the protective earth system. These kinds of compensation currents of normally 50 Hz even occur in
normal operation and do not represent a problem for data transmission. However, they may cause the
destruction of the shield contacts, particularly in the event of short-circuits in the environment.
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