Lenze E82xVxxxKxxxxx - Manual (Page 114)

Electrical installation
Basics for wiring according to EMC
Cable specifications
6
l
114 EDS82EV903 EN 3.0
6.3 Basics for wiring according to EMC
6.3.1 Cable specifications
Motor cable design
ƒ Only use shielded, four−core motor cables (core: U, V, W, PE and outer shield).
ƒ Cables with a YCY copper braid have a good shielding effect, cables with SY steel
reinforcement are less suitable (high shield resistance).
ƒ The contact ratio of the braid:
– At least 70 to 80 % with an overlap angle of 90
°
ƒ Use low−capacitance cables to minimise the leakage currents.
– The values depend on the cross−sections of the cables.
ƒ The rated voltage of the motor cable for inverter operation is V
0
/V = 0.6/1 kV.
The EMC safety of the connection for the motor temperature monitoring depends on the
laying system of the shielded connecting cable.
EMC safety Laying system Comment
Excellent Motor cable and PTC cable
are installed separately Ideal laying system with very low
interference injections
Treat the PTC cable like a control
cable
Satisfactory Motor cable and PTC cable
are installed together with
separated shields Permitted laying system, but higher
interference injections
Unfavourable Motor cable and PTC cable
are installed together with a
common shield High−energy interference injections
Cable design for DC supply and brake resistor
ƒ These DC cables must be designed as the motor cable.
– Shielding
– Rated voltage
– Approval
ƒ Being relatively short, low−capacity versions are not necessary.
Control cable design
Control cables must be shielded to minimise interference injections.