powersoft M-Drive IK, User Manual

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9
Electromagnetic Compatibility (EMC) &
Safety
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
Wiring between the amp module and the load may lead
to radio frequency noise. The following guide lines should
be observed:
f f reduced cabling length is advisable;
f f keep cable pairs as close as possible to each other in
order to minimize the antenna effect;
f f design the cabling path far from RF noise source;
f f set the cabling for RF noise rejection: shielded or
twisted cables are advisable configuration (ref.
FIGURE 4 );
f f place ferrites as close to the module as possible
9 : 3.Ferrite cores
Reject RF noise from input and output cabling by
installing ferrite shields. Powersoft suggests the KITAGAWA
9 : 5.Mains Fuse
Replace the fuses with the same type and rating: time
delay fuse of 10A rating (2x Littelfuse series 215).
RFC-H13 ferrite core, or equivalent.
Wrap both cables around one side of each ferrite so that
it pass through each ferrite twice (ref. FIGURE 3 ). Install the
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
If not already present on the product, a full body metal
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.
FIGURE 3: Typical electrical schematic of the EMI Filter.
FIGURE 4: Ferrite core installation on I/O wirings.
Loose pair
Configuration
prone to high
RF noise
Parallel pair
Configuration
prone to RF noise
Twisted pair
Highly immune
to RF noise
Shielded pair
Highly immune
to RF noise
FIGURE 5: Cabling configuration.
Input
signal
FIGURE 6: Tools and best practice for improving
the electromagnetic compatibility.
AC MAINS filter
Chassis shielding
Amp module
inside
Ferrite core
Ferrite core
Output signal
9 : 6.Earth connection
This device must be powered exclusively by earth
connected mains sockets in electrical networks
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.
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