Servodrives / inverters series COSMOS 301X Installation, use and maintenance manual - EN
5.7.15 4 to 20mA analogue input
Some versions of the servo-drive/inverter are equipped with an analogue input stage for 4 to 20mA signals.
Current output sensors are very commonly used in industry, because they are less susceptible to electrical
interference than voltage signals. An additional advantage consists in that a disconnected cable is easier to
diagnose (due to absence of current).
The most common type of sensor has only two contacts: one for 24V power and an output contact; the
recommended connection scheme is as follows:
Since 4 to 20mA signals are inherently resistant to electrical interference, the wiring can be made by using
unshielded cables in many cases. However, a shielded cable is preferred when the wiring extends over great
distances or through particularly unfavourable environments.
Be careful about the analogue signal wiring, if these signals are used as reference signals for motor speed or
motor position. In case of excessive interference, the motor may behave uncontrollably; position the cable far
away from sources of noise (such as power cables, inverters, switching power supplies, contactors, motors,
etc.).
Ver. 1.09 SMITECdd 56/74
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