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8.5.4 Cable type and design [X1]
The mentioned cable denominations refer to cables by Lapp. They have proven effective and are
successfully used in many applications. However, similar cables from other manufacturers, for
example Lütze or Helukabel, may also be used.
LAPP KABEL UNITRONIC LiYCY (TP); 25 x 0,25mm²; 10,7 mm
shows the cable between the servo drive ARS 2100 SE and the control. The cable shown
has two cable shields.
The outer cable shield is connected on both sides to PE. Inside the servo drive the connector housing
of the D-Sub connector is connected to PE. When using metal D-Sub connector housings, the cable
shield is simply squeezed underneath the strain relief clamp.
Often, an unshielded cable is sufficient for the 24 V signals. In heavily disturbed surroundings or in the
case of long cables (l > 2 m) between the control and the servo drive ARS 2100 SE Metronix
recommends the use of shielded cables.
In spite of the differential design of the analogue inputs of the ARS 2100 SE the cables should not be
unshielded, since interferences, for example due to switching contactors or power stage interferences
of the converters can reach high amplitudes. They couple into the analogue signals and cause
common-mode interference, which may lead to deviation of the analogue measured values.
In the case of limited cable lengths (l < 2 m, wiring inside control cabinet) the outer dual-sided PE
shield is enough to guarantee undisturbed operation.
For optimal interference suppression on the analogue signals the cores for the analogue signals are to
be shielded together and separate from others. This internal cable shield is connected to AGND (Pin 1
or 14) on one side of the ARS 2100 SE. It can be connected on both sides in order to establish a
connection between the reference potentials of the control and the servo drive ARS 2100 SE. Pins 1
and 14 are directly connected to each other inside the controller.
8.5.5 Connection notes [X1]
The digital inputs are designed for control voltages of 24 V. Due to the high signal level a higher
interference immunity of these inputs is already guaranteed. The servo drive ARS 2100 SE provides a
24 V auxiliary voltage, which may be loaded with a maximum of 100 mA. This way the inputs can be
activated directly via switches. Activation via the 24 V outputs of a PLC is, of course, also possible.
The digital outputs are designed as so-called "high-side switches ". That means that the 24 V of the
servo drive ARS 2100 SE are actively switched through to the output. Loads such as lamps, relays,
and so on are thus switched from the output to GND24. The four outputs DOUT 0 to DOUT 3 can be
loaded with a maximum of 100mA each. The outputs can also be lead directly to 24 V inputs of a PLC.
Product Manual „Servo drives ARS 2100 SE“
Version 5.0
