Curtis 1238SE - Electrostatic Discharge (Esd); Decommissioning and Recycling the Controller

APPENDIX A
pg. 143
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
e B+ (and B–, if applicable) wires that supply power to a control panel should be bundled with the
other control wires to the panel so that all these wires are routed together. If the wires to the control
panel are routed separately, a larger loop area is formed. Larger loop areas produce more ecient
antennas which will result in decreased immunity performance.
Keep all low power I/O separate from the motor and battery leads. When this is not possible, cross
them at right angles.
ELECTROSTATIC DISCHARGE (ESD)
Curtis motor controllers contain ESD-sensitive components, and it is therefore necessary to protect
them from ESD (electrostatic discharge) damage. Most of the control lines have protection for moderate
ESD events, but must be protected from damage if higher levels exist in a particular application.
ESD immunity is achieved either by providing sucient distance between conductors and the ESD
source so that a discharge will not occur, or by providing an intentional path for the discharge current
such that the circuit is isolated from the electric and magnetic elds produced by the discharge. In
general the guidelines presented above for increasing radiated immunity will also provide increased
ESD immunity.
It is usually easier to prevent the discharge from occurring than to divert the current path. A
fundamental technique for ESD prevention is to provide adequately thick insulation between all
metal conductors and the outside environment so that the voltage gradient does not exceed the
threshold required for a discharge to occur. If the current diversion approach is used, all exposed
metal components must be grounded. e shielded enclosure, if properly grounded, can be used
to divert the discharge current; it should be noted that the location of holes and seams can have a
signicant impact on ESD suppression. If the enclosure is not grounded, the path of the discharge
current becomes more complex and less predictable, especially if holes and seams are involved.
Some experimentation may be required to optimize the selection and placement of holes, wires, and
grounding paths. Careful attention must be paid to the control panel design so that it can tolerate a
static discharge.
MOV, transorbs, or other devices can be placed between B- and oending wires, plates, and touch
points if ESD shock cannot be otherwise avoided.
DECOMMISSIONING AND RECYCLING THE CONTROLLER
e controller is intended for installation into an Original Equipment Manufacturer (OEM) vehicle.
ey are a component that has no function unless installed as part of the specic vehicles’ electrical
or electro-hydraulic control system.
For controller decommissioning and recycling:
1. Follow the OEM’s vehicle decommissioning instructions.
2. Follow all applicable landll directives or regulations for
Electrical and Electronic Equipment (EEE) waste.