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Wiring
4.2 Control interfaces
Note
Malfunction caused by incorrect switching states as the result of diagnostic flows in the off state
(logical state "0")
In contrast to mechanical switching contacts, e.g. emergency stop switches, diagnostic flows
can also flow with semiconductor switches in the off state. If interconnection with digital inputs
is faulty, the diagnostic flows can lead to incorrect switching states and thus to a malfunction of
the drive.
● Observe the conditions for digital inputs and digital outputs specified in the relevant
manufacturers documentation.
● Check the conditions of the digital inputs and digital outputs in regard to the flows in off state.
If applicable, connect the digital inputs with suitably dimensioned, external resistors to
protect against the reference potential of the digital inputs.
NOTICE
Overvoltages for long signal cables
Using > 30 m long cables at the converter's digital inputs and 24 V power supply or inductive
circuits at the digital inputs can lead to overvoltage. Overvoltages can damage the converter.
● Connect an overvoltage protection device between the terminal and the associated
Electric shock due to damaged insulation
Damaged insulation of cables carrying hazardous voltages can cause a short circuit with
cables carrying non-hazardous voltages. This can have the effect that parts of the converter
or the installation carry an unexpectedly high voltage.
● Use only cables with double insulation for 230 V cables which you connect to the digital
Table 4-9
Solid or finely stranded conduc‐
Cables with twin end sleeves are not permissible.
100
reference potential.
We recommend using the Weidmüller overvoltage protection terminal with designation
MCZ OVP TAZ DIODE 24VDC.
WARNING
outputs of the converter.
Permissible cables and wiring options
tor
Finely stranded conductor with
non-insulated conductor end
sleeve
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Finely stranded conductor with
partially insulated conductor end
sleeve
SINAMICS G120XA converter
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