Electrical installation
Page 91
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 item servo positioning controller C 1-Series and the control. The cable shown has two
cable shields.
The outer cable shield is connected on both sides to PE. Inside the servo positioning controller 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 item servo positioning controller C 1-Series item recommends the use of shielded cables.
In spite of the differential design of the analog inputs of the item C 1-Series 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 analog signals and cause common-mode interference, which may lead to deviation of the
analog 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 analog signals the cores for the analog 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 item C 1-Series. It can
be connected on both sides in order to establish a connection between the reference potentials of the control and the item
servo positioning controller C 1-Series. 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 item servo positioning controller C 1-Series 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 item servo positioning
controller C 1-Series 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.
