CDHD
Installation
User Manual
19
Input Power Filtering
The CDHD electronic system components require EMI filtering in the input power
leads to meet the conducted emission requirements for the industrial
environment. This filtering blocks conducted type emissions from exiting onto
the power lines and provides a barrier for EMI on the power lines.
Care must be taken to adequately size the system. The type of filter is
determined according to the voltage and current rating of the system and
whether the incoming line is single- or three-phase. One input line filter is used
for multi-axis control applications. Mount these filters as close to the incoming
power as possible to prevent noise from being capacitively coupled into other
signal leads and cables. Similarly, use care when routing wires from the load
side of the filter to the bus module. These lines may be noisy and must be
separated from other sensitive cabling to avoid unwanted coupling of noise.
Several suitable filters are listed in Table
3-1. Manufacturers should be able to
recommend the best filter design for particular motor control applications.
Implementation of the EMI filter must adhere to the following guidelines:
Filter must be mounted on the same panel as the drive and bus module.
Filter must be mounted as close as possible to incoming cabinet power.
Filter must be mounted as close as possible to bus module. If separation
exceeds 30 cm, a flat cable (braid) is used for the high frequency connection
between filter and bus module.
When mounting the filter to the panel, remove any paint or material
covering. Use an unpainted metallic back panel, if possible.
Filters are provided with a ground connection. All ground connections must
be tied to ground.
Filters can produce high leakage currents. Filters must be grounded
before connecting the supply!
Filters should not be touched for 10 seconds after removing the supply.
Table
3-1. Recommended EMI Line Filters
Bus Module Model # Recommended EMI Line Filter
CDHD-003
Filter Concepts SF7
Schaffner FN258-7/07
CDHD-006
Filter Concepts SF15
Schaffner FN258-16/07
CDHD-0013
Schaffner FN258-16/07
Note:
The filters listed in this table are used on a one-to-one correspondence with the
drive. If drives are paralleled off one filter, it needs to be sized. Drives can be
ganged off one EMI filter.
