over a large surface area. You achieve contact over a large surface area with
bare connection surfaces or multiple connection screws. For screw
connections, you can establish the contact to varnished surfaces by using
tooth lock washers.
Metal surfaces
Always use connecting elements (screws, nuts, washers) with good
electroconductive surface.
Bare zinc-coated or tinned metal surfaces have good electroconductive
properties.
Anodized, yellow chromatized, black gunmetal finish or lacquered metal
surfaces have bad electroconductive properties.
Ground wires and shield connec‐
tions
When connecting ground wires and shield connections, what is important is
not the cross section of the wire, but the area of the contact surface, since
high-frequency interference currents mainly flow on the surface of the
conductor.
Always connect cable shields, especially shields of the motor power cables,
to ground potential over a large surface area.
Installing signal lines and signal cables
Line routing
For measures to prevent interference, see the Project Planning Manuals for
each device. In addition, we recommend the following measures:
● Route signal and control lines separately from the power cables with a
minimum distance of d5 = 100 mm (see Division into areas (zones),
page 55) or with a grounded separating sheet. The optimum way is to
route them in separate cable ducts. If possible, lead signal lines into the
control cabinet at one point only.
● If signal lines are crossing power cables, route them in an angle of 90°
in order to avoid interference injection.
● Ground spare cables, that are not used and have been connected, at
least at both ends so that they do not have any antenna effect.
● Avoid unnecessary line lengths.
● Run cables as close as possible to grounded metal surfaces (reference
potential). The ideal solution are closed, grounded cable ducts or metal
pipes which, however, is only obligatory for high requirements (sensitive
measuring lines).
● Avoid suspended lines or lines routed along synthetic carriers, because
they are functioning like reception antennas (noise immunity) and like
transmitting antennas (emission of interference). Exceptional cases are
flexible cable tracks over short distances of a maximum of 5 m.
Shielding
Connect the cable shield immediately at the devices in the shortest and most
direct way possible and over the largest possible surface area.
Connect the shield of analog signal lines at one end over a large surface
area, normally in the control cabinet at the analog device. Make sure the
connection to ground/housing is short and over a large surface area.
Connect the shield of digital signal lines at both ends over a large surface
area and in short form. In the case of potential differences between beginning
and end of the line, run an additional bonding conductor in parallel. This
prevents compensating current from flowing via the shield. The
recommended cross section is 10 mm
2
.
Separable connections always have to be equipped with male and female
connectors with grounded metal housings.
62/123
Mounting, dismounting and electrical installation
IndraDrive X Drive Controllers Power Sections XCS1, XMD1,
XMQ1
Bosch Rexroth AG R911392532_Edition 01
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