AF6ZP0CA – COMBIAC0 & ACE0 2uC – User Manual Page – 43/155
4 IMPORTANT NOTE: it is always much easier and cheaper to avoid ESD from
being generated, rather than increasing the level of immunity of the electronic
devices.
There are different solutions for EMC issues, depending on the required level of
emissions/ immunity, the type of controller, materials and position of the wires
and electronic components.
1) EMISSIONS. Three ways can be followed to reduce the emissions:
- SOURCE OF EMISSIONS: finding the main source of disturb and work
on it.
- SHIELDING: enclosing contactor and controller in a shielded box; using
shielded cables;
- LAYOUT: a good layout of the cables can minimize the antenna effect;
cables running nearby the truck frame or in iron channels connected to
truck frames are generally a suggested not expensive solution to reduce
the emission level.
2) ELECTROMAGNETIC IMMUNITY. The considerations made for emissions
are valid also for immunity. Additionally, further protection can be achieved
with ferrite beads and bypass capacitors.
3) ELECTROSTATIC IMMUNITY. Three ways can be followed to prevent
damages from ESD:
- PREVENTION: when handling ESD-sensitive electronic parts, ensure the
operator is grounded; test grounding devices on a daily basis for correct
functioning; this precaution is particularly important during controller
handling in the storing and installation phase.
- ISOLATION: use anti-static containers when transferring ESD-sensitive
material.
- GROUNDING: when a complete isolation cannot be achieved, a good
grounding can divert the discharge current trough a “safe” path; the
frame of a truck can works like a “local earth ground”, absorbing excess
charge. So it is strongly suggested to connect to truck frame all the parts
of the truck which can be touched by the operator, who is most of the
time the source of ESD.
5.4 Various suggestions
- Never connect SCR low frequency chopper with asynchronous inverter
because the asynchronous filter capacitors alter the functioning of the SCR
choppers. If it is necessary to use two or more control units (for example
traction and lift), they must belong to the ZAPIMOS family.
- During battery charge, disconnect asynchronous from the battery.
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