
6
Electrical installation
Shielding and routing bus cables
Manual – DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
43
Proceed as follows:
1. Do
not
switch off the voltage supply at any stage during the process.
2. Press the reset button T1 on the front of the DH.21B/41B option card for 3
seconds. Once the boot loader update has started, only LED 4 will flash.
ð
When L4 flashes green, the bootloader update is completed successfully.
6.4
Shielding and routing bus cables
Only use shielded cables and connection elements that meet the requirements of cat-
egory 5, class D according to IEC 11801 edition 2.0.
Correct shielding of the bus cable attenuates electrical interference that can occur in
industrial environments. The following measures ensure the best possible shielding:
•
Manually tighten the mounting screws on the connectors, modules, and equipoten-
tial bonding conductors.
•
Use only connectors with a metal housing or a metalized housing.
•
Connect the shielding in the connector over a wide surface area.
•
Apply the shielding of the bus cable on both ends.
•
Route signal and bus cables in separate cable ducts. Do not route them parallel to
power cables (motor leads).
•
Use metallic, grounded cable racks in industrial environments.
•
Route the signal cable and the corresponding equipotential bonding close to each
other using the shortest possible route.
•
Avoid using plug connectors to extend bus cables.
•
Route the bus cables closely along existing grounding surfaces.
NOTICE
In case of fluctuations in the ground potential, a compensating current may flow via
the bilaterally connected shield that is also connected to the protective earth (PE).
Make sure you supply adequate equipotential bonding in accordance with relevant
VDE regulations in such a case.
22900055/EN – 08/2016
Summary of Contents for DH 21B Series
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