JUMO 709050 IPC IGBT Power Converter IPC 70A Operating Manual - Manual (Page 15)

02.08 [IGBT Power Converter 70A] 15
3 Installation
3.2 Filtering and interference suppression
System Compliance with the EMC standards can only be achieved through additional
EMC measures. These include:
- a supply filter in the voltage supply
- a shielded cable for the voltage supply
- a shielded cable to the load
- Functional equipotential bonding
Compliance with the EMC standards must be tested for the overall system.
Construction To keep interference emission through conducted and radiated interference
below the permissible levels defined in CISPR 16-1 and CISPR 16-2,
constructive measures must be taken in the installation and wiring stages in
addition to supply input filtering. Poor earth connection or shielding of the
EMC filter will reduce the effectiveness of the interference suppression
measures.
The following points should be noted in order to achieve good configuration
for EMC purposes:
h All metallic components of the converter or cabinet must be well bonded
for HF currents over a large surface area.
h The EMC filter should be installed close to the IPC, if possible, on a
common metal plate. Route cables for control inputs and signal cables as
far apart from each other as possible, and use shielded cables.
h If possible, do not route power cables in the same cable duct as control or
signal cables.
h The cable between the load and the IPC should be as short as possible and
not exceed 50 m.
Earthing The base plate, the supply filter and the shielding of the supply cable must be
earthed to a star point using HF braiding.
Choosing
a suitable
cable
k If the cable between the filter and the IPC is longer than 300 mm, we
recommend to use a shielded cable with the shielding earthed at both
ends. Route cables inside the switch cabinet as close as possible to
grounded surfaces, otherwise they can act as antennae and radiate
interference.
k To achieve a good shielding effect for the cable, only use cables that have
shielding made with tinned or nickel-plated copper braiding. The coverage
of the shielding should be at least 70%; the lay angle should be 90°.
Screens made of steel braiding are not suitable. Earth the shielding of the
load cable on both ends.
k The shielding of the control inputs must only be earthed at one end. If
potential differences exist, install an additional equipotential bonding
conductor.