NI-9477 Exceeding Continuous Max Current

[jwright1]

Hi,

I have a cdaq setup with a ni-9477 which can handle 1A max per channel up to 20A. This module is used for 2 solenoid valves at 0.6A. At some point the user switched out the previous solenoid valve with a 1.7A solenoid valve. I don't know how long this was being used for but it was still operating the valve for a while and then it stopped operating the valve. I noticed the channel used with this valve is now shorting to ground even when not switching it on. The other channels still work with switching on and off, so I tried using two and even three of the other channels in parallel for the increased current to operate the valve but no luck. What happens to the module when it is operating above the max current and is this module done now?

Thanks,

-Jonathan

[santo_13]

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@jwright1 wrote:

Hi,

I have a cdaq setup with a ni-9477 which can handle 1A max per channel up to 20A. This module is used for 2 solenoid valves at 0.6A. At some point the user switched out the previous solenoid valve with a 1.7A solenoid valve. I don't know how long this was being used for but it was still operating the valve for a while and then it stopped operating the valve. I noticed the channel used with this valve is now shorting to ground even when not switching it on. The other channels still work with switching on and off, so I tried using two and even three of the other channels in parallel for the increased current to operate the valve but no luck. What happens to the module when it is operating above the max current and is this module done now?

Thanks,

-Jonathan

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If those two channels appear short to ground, I am afraid that it is permanently damaged (and require a repair which may cost the close to a new module unless you can do that yourself).

Since the module doesn't have a short circuit protection, it would have not limited any current beyond 1A and slowly died.