MOVIDRIVE
®
PROFIBUS DFP11A
9
Assembly / Installation
Instructions
2
The MOVIDRIVE
®
drive inverter is connected to the PROFIBUS system via a twisted, shielded two-
wire cable.
The connection of the two-wire cable to the PROFIBUS connector is via pin 8 (A/A') and pin 3 (B/
B'). These two contacts are used for communication. The RS-485 signals A/A' and B/B' must be
contacted the same on all PROFIBUS stations, as otherwise communication via the bus will not be
possible.
Via pin 4 (CNTR-P) the PROFIBUS option pcb supplies a TTL control signal for a repeater or LWL
adapter (reference = pin 9).
2.4
Shielding and Laying of the Bus Cables
The DFP11 PROFIBUS option pcb supports RS-485 transmission technology and requires as a
physical medium a shielded, two-wire twisted-pair cable (cable type A) specified for PROFIBUS in
accordance with DIN 19245 Part 3 (see Appendix).
Technically correct shielding of the bus cable absorbs the electrical interference that can occur in
an industrial environment. You will achieve the best shielding results if you adopt the following
measures:
• Hand-tighten the fixing screws of plugs, modules and equipotential bonding conductors.
• Only use plugs with metal or metal-plated housings.
• Connect the shielding in the plug over as large an area as possible.
• Connect the shielding at both ends of the bus cable
• Do not lay signal and bus cables parallel to power cables (motor cables), but wherever possible
in separate cable conduits.
• In an industrial environment use metallic, grounded cable trays.
• Run signal cables and the associated equipotential bonding conductor as close as possible to
each other, using the shortest route.
• Avoid extending bus cables through the use of connectors.
• Run the bus cables close to existing grounded surfaces.
Important:
In the event of fluctuations in the ground potential, a circulating current may flow through any
shielding which may be connected at both ends and connected to the ground potential (PE). In this
case, ensure there is adequate equipotential bonding in accordance with the relevant DIN VDE pro-
visions.
2.5
Bus Termination
If the MOVIDRIVE
®
drive inverter is at the beginning or the end of a PROFIBUS segment, connec-
tion to the PROFIBUS network, as a rule, is not via a T bus with an incoming and outgoing PROFI-
BUS cable but directly with only one PROFIBUS cable. To avoid interferences on the bus system
caused by reflections etc., the PROFIBUS segment must be terminated with bus terminating resis-
tors on the physically first and last stations.
As the bus terminating resistors can be connected on the DFP11 option pcb of the drive inverter it
is not necessary to use a type D connector with integrated terminating resistors.