Electromagnetic Compatibility (Emc); 1.Ac Mains Filter; 2.Cabling; 3.Ferrite Cores - powersoft IpalMod User Manual

Electromagnetic Compatibility (EMC)

9 : 1.AC MAINS filter

In order to improve the electromagnetic compatibility
an EMC filter must be inserted before the AC MAINS
plugs on the power supply. Powersoft suggests:
Schaffner FN2030-10-06 model.

9 : 2.Cabling

FIGURE 3: Typical electrical schematic of the EMI Filter.
Wiring between the amp module and the load may lead
to radio frequency noise. The following guide lines should
be observed:
f reduced cabling length is advisable;
f keep cable pairs as close as possible to each other in
order to minimize the antenna effect;
f design the cabling path far from RF noise source;
f set the cabling for RF noise rejection: shielded or
twisted cables are advisable configuration (ref.
FIGURE 4);
f place ferrites as close to the module as possible
FIGURE 5: Cabling configuration.

9 : 3.Ferrite cores

Reject RF noise from input and output cabling by in-
stalling ferrite shields. Powersoft suggests the KITAGAWA
4 | IpalMod | User guide
RFC-H13 ferrite core, or equivalent.
it pass through each ferrite twice (ref.
ferrite shield as close as possible to where the cable plugs
into the amplifier. Placing the ferrite elsewhere on the cable
noticeably reduces its effectiveness.

9 : 4.Chassis shielding

chassis or a shielding cage will provide best shielding of RF
emission. In order to achieve the highest shielding, minimize
the amount and size of holes or opening in the chassis.
Loose pair
Configuration
prone to high
RF noise
Parallel pair

9 : 5.Mains Fuse

Configuration
prone to RF noise
Twisted pair delay fuse of 10A rating (2x Littelfuse series 215).
Highly immune

9 : 6.Earth connection

to RF noise
Shielded pair
Highly immune
to RF noise
compliant to the IEC 364 or similar rules. Is absolutely nec-
essary to verify this fundamental requirement of safety and,
in case of doubt, require an accurate check by a qualified
personal.
Is absolutely necessary to ground this device using the
proper earth connection on the metal frame of the chas-
sis; use M4 nut and bolt with proper split washer – grover
washer – to secure the earth terminal lug.
Wrap both cables around one side of each ferrite so that
FIGURE 4: Ferrite core installation on I/O wirings.
If not already present on the product, a full body metal
Input
signal
Ferrite core
AC MAINS filter
Amp module
Chassis shielding
FIGURE 6: Tools and best practice for improving
the electromagnetic compatibility.
Replace the fuses with the same type and rating: time
This device must be powered exclusively by earth
connected mains sockets in electrical networks
9
FIGURE 3). Install the
Output signal
inside
Ferrite core