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11.2 Table of Cable Sizes and Maximum Lengths
Inverter type VXS… 20-1 40-1 75-1 150-1 220-1 40-3 75-3 150-3 220-3 400-3
Cable Sizes
Mains supply & motor mm
2
1.5 2.5 2.5 4 4 1.5 1.5 2.5 2.5 4
Earth cable mm
2
1.5 2.5 2.5 4 4 1.5 1.5 2.5 2.5 2.5
Braking resistor cable mm
2
NA 2.5 2.5 4 4 1.5 1.5 2.5 2.5 2.5
Maximum Length of Motor Cables
Unscreened cable
(1)
m 30 50 50 100 100 30 30 100 100 100
Screened cable m 15 30 30 60 60 30 30 60 60 60
Related Fuse and MCB Sizes
MCB trip rating
(2)
A 6 6 10 10 20 6 6 6 10 10
MCB trip rating
(3)
A 6 10 16 20 32 6 6 10 16 16
Fuse rating
(2)
A10102032406 6 101020
Fuse rating
(3)
A10102032406 6 101020
(1)
Not generally recommended. Refer to page 58.
(2)
With DC reactor
(3)
Without DC reactor
NOTES
1 The above data is for guidance only. National and local regulations and guidelines
should be strictly observed.
2 The above data applies only to installations NOT equipped with motor line reactors.
3 The length of motor cable may be extended by the installation of motor line reactors.
4 Longer cables without motor line reactors can be achieved by reducing the PWM
carrier frequency, Function 12.
5 If the length of the motor cable is greater than 50m, it may be necessary to reduce the
PWM carrier frequency, Function 12, to 0 to reduce the effect of leakage current.
6 Long cables may reduce the starting torque output of the motor due to voltage drop.
7 It is recommended that MICC-type cable is NOT used for motor supply due to high
capacitance and thus greater limitation of maximum length.
8 The above data is based on the use of standard 4-pole squirrel cage induction motors.
9 If a non-standard motor is to be used, or cables in excess of 100m, consult IMO
Precision Controls Ltd.
10 The figures given in the above table are proven lengths. Under certain operating
conditions the maximum length may be considerably greater. If further assistance is
required, please consult IMO Precision Controls Ltd.
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