4.3 ASSESSING THE USER’S NEEDS
WARNING (HP, IN)
This should only be conducted by a healthcare professional. Curtiss-Wright accept no liability for losses of any kind resulting
in an incorrect assessment of a user’s abilities.
4.4 SELECTING THE SID
WARNING (HP, IN)
Due to the electrical output characteristics of many existing, industry-standard, proportional SIDs, it may not be possible to
detect leakage currents between the analogue (proportional) input pins of the Input Section. The following solutions are,
therefore, recommended:
1) Providing additional, environmental protection, for example a rubber boot, to the mated, D-type connectors will
improve the installation in this respect. It is the responsibility of the powerchair and/or SID suppliers to ensure a
suitable risk assessment is carried out for such SIDs. Refer to the declaration of standards for further information on
the impact on compliance.
2) Use of SIDs which have the capability to detect leakage currents across the analogue input pins of the Input Section.
Curtiss-Wright accept no liability for losses of any kind resulting from the use of proportional SIDs if neither of the above
recommendations are included in the installation.
4.5 INSTALLING THE SID ONTO A POWERCHAIR
WARNING (HP, IN)
The SID should be fitted to the powerchair in accordance with the instructions of both the SID and powerchair
manufacturers. Curtiss-Wright accept no liability for losses of any kind resulting from an incorrect installation of a SID.
4.6 USER SWITCH
WARNING (HP, IN)
For a truly fail-safe system, Curtiss-Wright recommend that a User Switch incorporating a resistor network is fitted. If one of
these is unavailable, a normally-closed User Switch should be used. This ensures that if the switch becomes accidentally
disconnected, the powerchair will default to a stop condition. If a normally-open switch is used, the responsibility for that
decision lies with the healthcare professional. Curtiss-Wright accept no liability for any losses resulting from the use of a
normally-open User Switch.
WARNING (HP, IN)
Because a disconnected User Switch means there is no emergency-stop function, Curtiss-Wright recommend that Switch
Detect is always set to On. Curtiss-Wright will accept no liability for any losses resulting from any other setting of this
parameter.
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