Curtiss-Wright | PG Drives Technology
SK77981-14
56 | R-net Technical Manual | Chapter 2 - Installation
12.1
EMISSIONS
A typical wheelchair and R-net installation have been type tested and have passed the requirements of CISPR 22 and FCC CFR47
part 15.
Observe the following recommendations to minimize radio frequency emissions:
12.1.1 MOTOR SUPPRESSION
For the drive motors solder a suitable suppression capacitor between the brush holders, inside the motor cases. Keep the
capacitor’s lead length as short as possible. We recommend a value of 4n7F 250V AC ceramic. The maximum value you should
use is 10nF. A typical type is Roderstein WY0472MCMCF0K.
The above should also be applied to actuator motors, if fitted. If it is not possible to fit these capacitors inside the actuator
motors, then contact the motor manufacturers for further advice. Alternatively, placing the capacitor externally, but as clos e as
possible to the motor, may have the same effect.
Some actuators have their own EMC suppression components fitted internally. In these instances, it may not be appropriate to
introduce further capacitance. If you are uncertain, contact the actuator manufacturers for further advice.
12.1.2 CABLES
You do not need to use screened battery and motor looms, but:
Keep the length of all wiring to a minimum.
Make sure the loop area of the wiring is minimized. Route the positive and negative wires to each motor tog ether.
Route the battery positive and negative wires together. Where possible, route the battery and motor looms together.
If fitted, route the lighting, indicator and actuator wires together.
Secure all looms to the wheelchair’s chassis over as much of their length as is practical.
Do not use the control system connectors as junction points for the battery connections. Separate junction points away
from the Power Module should be provided for the other wheelchair electrical functions.
12.2
IMMUNITY
The R-net control system family has been stringently tested for susceptibility to electromagnetic radiation over the frequency
range 26MHz to 1GHz. The installations passed the FDA requirements and the proposed requirements of EN12184.
Follow the recommendations in section 12.1.2 to ensure maximum immunity to electromagnetic radiation.
12.3
ELECTRO-STATIC DISCHARGE (E.S.D.)
There are various international standards currently under development for thi s aspect of the system’s performance. At present,
most of the standards are specifying the system to be tested to requirements of IEC1000 -4-2. Tests are carried out at 8kV air
discharge (to nonconductive surfaces) and 6kV contact discharge (to conductive s urfaces). The R-net family has been tested to
these levels.
If you need advice please contact Curtiss-Wright.
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