windinmysails
- Mar 12, 2012
- 26
- Joined
- Mar 12, 2012
- Messages
- 26
Hi all,
I'm not sure I've posted in quite the right part of the forum, so please feel free to move me if I'm wrong - I've had a look through and can't see anyone else asking this question, so here goes:
I'm running a inLog remote DAQ and control box at the end of quite a long piece of cable to turn on and off some 24V motors that take about 2A. The DAQ needs about 12V so I've popped in a voltage regulator and a small smoothing cap, but something strange happens which I can only attribute to voltage drop on my long cables. I've measured and without the motors running I'm down to about 20V at the entry to the voltage reg. When I fire up one of the motors (controllled by the DAQ) I'm guessing there's a surge that causes the voltage to drop so that the voltage regulator can't maintain its output. That causes the DAQ to reboot. If I isolate (i.e. give the DAQ it's own isolated supply) everything is fine. So I'm guessing I could use a decent sized capacitor across the output of my voltage regulator to keep up the voltage (the DAQ doesn't drain a lot of current) - but what size should I aim for?
Any suggestions very gratefully received!
Many thanks
Neil
I'm not sure I've posted in quite the right part of the forum, so please feel free to move me if I'm wrong - I've had a look through and can't see anyone else asking this question, so here goes:
I'm running a inLog remote DAQ and control box at the end of quite a long piece of cable to turn on and off some 24V motors that take about 2A. The DAQ needs about 12V so I've popped in a voltage regulator and a small smoothing cap, but something strange happens which I can only attribute to voltage drop on my long cables. I've measured and without the motors running I'm down to about 20V at the entry to the voltage reg. When I fire up one of the motors (controllled by the DAQ) I'm guessing there's a surge that causes the voltage to drop so that the voltage regulator can't maintain its output. That causes the DAQ to reboot. If I isolate (i.e. give the DAQ it's own isolated supply) everything is fine. So I'm guessing I could use a decent sized capacitor across the output of my voltage regulator to keep up the voltage (the DAQ doesn't drain a lot of current) - but what size should I aim for?
Any suggestions very gratefully received!
Many thanks
Neil