Servodrives / inverters series COSMOS 301X Installation, use and maintenance manual - EN
5.7.7 24V digital inputs
Some versions of the servo-drive/inverter are equipped with a certain number of 24V general-purpose digital
inputs. These inputs are typically used to acquire data from sensors with digital output, which are very
common in industry (such as photocells, limit switches, etc.).
The following picture shows an example of how a sensor is connected; in most applications, the wiring can
be made by means of an ordinary unshielded cable.
However, if the operating environment is affected by significant electrical noise or the distances to be
crossed are significant, the use of a shielded cable may be necessary. In this case, the shield must be
connected to earth on both sides, preferably with low-impedance connection, such as a metal cam; the
shield is totally ineffective if it is left floating.
Signal quality may be further improved by keeping the cables as far as possible from noise sources, such as
power cables, inverters, power supplies, relays, etc.
Check the sensor polarity before connection; inverted polarity may damage the sensor
and/or servo-drive.
Ver. 1.09 SMITECdd 47/74
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