13 Electrical installation
13.11 Connector: I/O interface [X1]
The BL4100-C servo drive has two differential inputs (AIN) for analogue input voltages in
the range of ± 10 V.The inputs AIN and #AIN are connected to the control system via
twisted cables (twisted-pair type). Alternatively, it is also possible to use a shielded cable.
If the control system is equipped with single-ended outputs, the output is connected to
AIN and #AIN is connected to the reference potential of the control system. If the control
system is equipped with a differential output, it must be connected 1:1 to the differential
inputs of the servo drive.
The reference potential GND24 must be connected to the reference potential of the control
system. This is necessary in order to prevent the differential input of the servo drive from
being overridden by high "common-mode interference".
Despite the differential design of the analogue input, using unshielded cables for the
analogue signals is not recommended, since interferences, e.g. caused by switching
contactors, or output stage interferences of the converters can reach high amplitudes.
The 24 V connections inside the control cabinet can be made without a shield. In the case
of long cables (l > 2 m) towards the PLC or outside the control cabinet, shielded cables
must be used. The shields of these cables must be connected to PE on both ends. The
cable shield can then be connected to the back panel of the control cabinet, for example.
For optimal interference suppression on the analogue signal lines, the cores for the
analogue signal must be shielded separately. It may be useful to run the analogue signal in
a separate, shielded cable.
The servo drive provides an auxiliary voltage of 24 V. As a result, the inputs can be
activated directly via switches.
The digital outputs are designed as so-called "high-side switches". This means that only
these 24 V are supplied to the output in the active state. In the passive state, the output
has a high resistance and the level is defined only by the flyback diode and a high internal
resistance.
Configuration on the device [X1]
D-SUB connector, 25-pin type, female
Mating connector [X1]
l D-SUB connector, 25-pin type, male
l Housing for a 25-pin D-SUB connector with locking screws of type 4/40 UNC
Product manual BL 4000-C Page 255 of 298
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