I am not sure why im getting these emails
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"Gregory, Neil" <[log in to unmask]> wrote:

>Hi,
>
> 
>
>Just to clarify I'm not suggesting isolating the battery, but using a
>relay into the usual Jack socket perhaps, e.g. on a G90A controller,
>just getting some power from somewhere convenient to do this, e.g. the
>battery.
>
> 
>
>It's not that uncommon for head switches users to wish to rest their
>heads at some point and not get the chair to drive.
>
> 
>
>Thanks,
>
> 
>
>Neil Gregory
>Senior Bio-Engineer
>WeSTMARC - West of Scotland Mobility and Rehabilitation Centre
>Southern General Hospital, Glasgow
>Email: [log in to unmask]
>
>Web: www.nhsggc.org.uk/westmarc
>
>
>Tel - 0844 8113001 (Lo-Call)
>
>Fax - 0141-201 2649
>
>________________________________
>
>From: A discussion list for Assistive Technology professionals.
>[mailto:[log in to unmask]] On Behalf Of Geggie, Colin
>Sent: 05 October 2011 08:27
>To: [log in to unmask]
>Subject: Re: EC Control of powered wheelchair on/off
>
> 
>
>Neil
>
> 
>
>I agree I would always use the jack socket input to switch a wheelchair
>on/off.  I would avoid trying to isolate the battery.  The peak currents
>are huge and you don't want to do anything that might compromise the
>safety of the system.
>
> 
>
>Some powered wheelchair control systems have a drive inhibit input on
>the power module for example VR2.  It might be possible to put the
>wheelchair in an inhibit mode, a sort of standby mode, by connecting a
>relay here.  I havn't done this myself but I did give it some
>consideration when we had a patient who couldn't use the VR2 on/off
>button and with VR2 there isn't a jack socket for external on/off.  I'm
>sure it would be safer to use an inhibit input rather than a relay at
>the battery.  Obviosuly anything like this would have to be risk
>analysed carefully.
>
> 
>
>regards
>
> 
>
>Colin Geggie
>
>Clinical Bioengineer, Environmental Control Co-ordinator
>
>SMART (South East Mobility and Rehabilitation Technology) Centre
>
>Astley Ainslie Hospital
>
>133 Grange Loan
>
>Edinburgh
>
>EH9 2HL
>
>Tel.  0131 537 9423
>
>Fax. 0131 537 9552
>
>________________________________
>
>From: A discussion list for Assistive Technology professionals.
>[mailto:[log in to unmask]] On Behalf Of James Dean
>Sent: 05 October 2011 07:57
>To: [log in to unmask]
>Subject: Re: EC Control of powered wheelchair on/off
>
>Hi Neil,
>
> 
>
>Many chairs have a momentary switch input so an external switch can be
>used to cycle the power and/or drive modes. You could use an ECU to
>activate this input if necessary via a small relay. (Some also have a
>drive inhibit, which just stops the motion)
>
> 
>
>I'd check with any chair manufacturer before isolating the whole chair
>system from the battery - I suspect you might end up with system
>throwing a substantial tantrum!
>
> 
>
>Cheers,
>
>James Dean
>
> 
>
>([log in to unmask])
>
>Technical Solutions Australia P/L
>
>109 Ferndale Rd
>
>Silvan Vic  3795
>
> 
>
>Ph: 03 9737 9000
>
>Fax: 03 9737 9111
>
>www.tecsol.com.au <http://www.tecsol.com.au/> 
>
>	-----Original Message-----
>	From: A discussion list for Assistive Technology professionals.
>[mailto:[log in to unmask]] On Behalf Of Gregory, Neil
>	Sent: Wednesday, 5 October 2011 12:17 AM
>	To: [log in to unmask]
>	Subject: EC Control of powered wheelchair on/off
>
>	Dear integrators,
>
>	 
>
>	I've been asked the question whether an Environmental Control
>controller could switch on/off a powered wheelchair. I would presume
>that a powered relay from the chair's battery with a radio link may
>work, but not an off the shelf solution. It's an age since I've seen an
>SRS working with a P&G Controller so unsure if there is a function here
>for this. I'm not been pushed to get this done, but an interesting
>little thought exercise.
>
>	 
>
>	I would welcome your thoughts.
>
>	 
>
>	Thanks,
>
>	 
>
>	Neil Gregory
>	Senior Bio-Engineer
>	WeSTMARC - West of Scotland Mobility and Rehabilitation Centre
>	Southern General Hospital, Glasgow
>	Email: [log in to unmask]
>
>	Web: www.nhsggc.org.uk/westmarc
>
>	
>	Tel - 0844 8113001 (Lo-Call)
>
>	Fax - 0141-201 2649
>
>	 
>
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