Lenze EVF9333−xV - Manual (Page 97)

Wiring of the standard device
Basics for wiring according to EMC
Shielding
5
5.3
5.3.1
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5.3−1 EDSVF9333V EN 6.2−04/2012
5.3 Basics for wiring according to EMC
5.3.1 Shielding
The quality of shielding is determined by a good shield connection:
ƒ Connect the shield with a large surface.
ƒ Connect the shield directly to the intended shield sheet of the device.
ƒ In addition, connect the shield to the conductive and earthed mounting
plate with a large contact surface by using a conductive clamp.
ƒ Unshielded cable ends must be as short as possible.
5.3.2 Mains connection, DC supply
ƒ Controllers, mains chokes, or mains filters may only be connected to
the mains via unshielded single cores or unshielded cables.
ƒ When a mains filter or RFI filter is used, shield the cable between mains
filter or RFI filter and controller if its length exceeds 300 mm.
Unshielded cores must be twisted.
ƒ In DC−bus operation or DC supply, use shielded cables.
ƒ The cable cross−section must be dimensioned for the assigned fusing
(observe national and regional regulations).
5.3.3 Motor cable
ƒ Only use shielded motor cables with braids made of tinned or
nickel−plated copper. Shields made of steel braids are not suitable.
– The overlap rate of the braid must be at least 70 % with an overlap
angle of 90 °.
ƒ The cables used must correspond to the requirements at the location
(e.g. EN 60204−1).
ƒ Shield the cable for motor temperature monitoring (PTC or thermal
contact) and install it separately from the motor cable.
– In Lenze system cables, the cable for brake control is integrated into
the motor cable. If this cable is not required for brake control, it can
also be used to connect the motor temperature monitoring up to a
length of 50 m.
ƒ Connect the shield with a large surface and fix it with metal cable
binders or a conductive clamp.
ƒ Connect the shield directly to the corresponding device shield sheet.
– If required, additionally connect the shield to the conductive and
earthed mounting plate in the control cabinet.
ƒ The motor cable is optimally installed if
– it is separated from mains cables and control cables,
– it only crosses mains cables and control cables at right angles,