APPENDIX B — VEHICLE SYSTEM DESIGN CONSIDERATIONS-&-RECYCLING
Curtis Model 1351 – December 2018
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APPENDIX B — VEHICLE SYSTEM DESIGN
CONSIDERATIONS-&-RECYCLING
VEHICLE DESIGN CONSIDERATIONS
REGARDING ELECTROMAGNETIC COMPATIBILITY (EMC)
AND ELECTROSTATIC DISCHARGE (ESD)
ELECTROMAGNETIC COMPATIBILITY (EMC)
Electromagnetic Compatibility (EMC) encompasses two areas: emissions and immunity. Emissions
are radio frequency (RF) energy generated by a product. is energy has the potential to interfere
with communications systems such as radio, television, cellular phones, dispatching, aircra, etc.
Immunity is the ability of a product to operate as intended in the presence of RF energy generated by
other sources as well as itself. EN12895 is the relevant EMC standard for the CE marking of industrial
trucks intended for sale in Europe and some other countries.
EMC Compliance is ultimately a system requirement. Part of the EMC performance is designed into
or inherent in each component of a system; another part is designed into or inherent in end product/
system characteristics such as shielding, wire routing, individual component layout and a portion
is a function of the interactions between all these parts. e techniques presented below can help
reduce the risk of EMC problems in products that incorporate Curtis system and motor controllers.
Emissions
High frequency signals can produce RF emissions that are measurable during Radiated Emissions
testing. Long cable and wire harness runs essentially become antennas for the emissions to travel
(beyond the source). erefore, emission reduction techniques include making the battery and motor
cables as short as possible. Minimize the lengths of the AMPseal connector’s wire harness runs and
the formation of wire loops. Further emission decreases may include using shielded cables or ferrites
on the control wires and twisting the motor and battery cables. Route the battery and AC motor
cables separate from the control wires. When separating control wires and the battery/motor cable
routing is not possible, cross them at right angles.
RF Immunity
Radiated immunity problems may occur when the controller is located close to other devices
generating high RF energy. Possible ways to help prevent other devices from interfering with a
Curtis controller include:
• Placing the controller as far as possible from such noise sources.
• Shield the controller from the noise
• Enclose the controller in a metal box and add proper ferrites to all cabling entering and
leaving it.
• Other possible solutions include the use of ferrite beads at the RF noise source(s) to prevent
the noise from traveling along the wiring harness and cross-conducting onto sensitive
wires and common connections.
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