Servodrives / inverters series COSMOS 301X Installation, use and maintenance manual - EN
5.4.2 Cables and protection devices
Here are the specifications of the cables to be used for wiring:
Minimum cross-section of solid conductor * ** 1.5 mm
2
Maximum cross-section of solid conductor * ** 4.0 mm
2
Minimum cross-section of flexible conductor * ** 1.5 mm
2
Maximum cross-section of flexible conductor * ** 2.5 mm
2
*= Use 60/75 °C wires only (UL)
**= Use Copper Conductors only (UL)
The terminal board contacts must be tightened by means of a flat-blade screwdriver (blade width: 3.5 mm);
the recommended tightening torque is equal to 0.55 Nm ±10%.
In order to protect the device and the power cables, install a protective device against overload and short-
circuit. Since the input current is strongly distorted by the rectifier, its efficient value may be far higher than
the output current, therefore it is necessary to carefully choose the protective devices.
In case of failure, the input current might include a significant direct component; if no fuse is used for
protection, install a type-B protective device.
An inadequate overload protection device might not trip, with consequent danger for
people and equipment. Spurious tripping of the protective device might also occur.
Make sure the maximum short-circuit current of the power supply terminal boards is
lower than 5 kA; otherwise, use adequate limiting devices (such as fuses).
Ver. 1.09 SMITECdd 34/74
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