What is the maximum cable distance from Altistart 48 Soft Starter to motor.
There is no distance limit clearly fixed for the Maximum Cable length,
The official limit guaranteed is about 100m.
However, we know applications working without any problem between 300m and 400m non shielded cable.
Over you may have problems of PHF tripping due to a too high cable capacitance which may perturb the synchronization. So, to reduce the perturbation from the motor cable, you need to reduce its capacitance to the earth: do not use shielded cable, use cable with low capacitance to earth.
The main problem is the drop voltage in the motor cable (the available torque is depending the square of the voltage T=kU²).
General rules are:
- do not use shielded cable
- the drop voltage must be < 10 % between the output of ATS and the motor for the starting sequence.
- the drop voltage must be < 5 % in the same conditions during permanent duty.
- use cable with low capacitance to earth.