PXIe-6363 +5V output?

[ster]

Hi all,

Where is location of fuse for the +5V of PXIe-6363 (pins 8 & 14 of connectors 0 & 1)?

Thanks!

[JVP]

Hi Ster,

We do not give out that information because it will void your warranty if you try to replace the fuse yourself. For what particular reason do you need this information?  Is the fuse blown or are you trying to modify your card for your particular application?

Regards,

Jignesh P

[ster]

Hi Jignesh,

Trying to fill in knowledge gap regarding fuse.  User manual clearly specifies +5V outputs are fused at 1A, but no further information.  Would like to know fuse location, so field troubleshooting guide can include "ohming out" to determine if fuse is blown.  Is fuse slow or fast blow?  One-time blow, or resets after time?  Also, what else does the fuse protect?  Said another way, if fuse does blow - what other card functions/features may be impacted?  We need to advise end-user accordingly.

NI User Manual contains lots of good information, but for the PXIe-6363 there is very little about the +5V fuse.  I understand the fuse is not a user serviceable part and the warranty will be void if it is field replaced.  Please note my questions have nothing to do with replacing the fuse (your concern mentioned below).  I need to provide more detailed fuse information to our end-user and it is missing from NI's documentation.

Thanks!

Gary

[John_P1 · Accepted solution]

Hi Gary,

Seems reasonable enough. On of the current revision of the PXIe-6363 (193435C-01L), there are actually 4 total fuses (labelled F1 through F4 on the PCB).  Be aware that the fuses are subject to change with different revisions of the 6363.

F1:  Slow Blow on the +3.3V rail of the PXIe connector.

F2:  Slow Blow on the +12V rail of the PXIe connector.

F3:  Polyswitch (self-resettable) fuse on the user-accessible 5V rail of connector 0

F4:  Polyswitch (self-resettable) fuse on the user-accessible 5V rail of connector 1.

The polyswitch fuses are directly between the user-accessible pin and the internal 5V supply on the board.  If the 1A current limit is exceeded on either of the connectors, the polyswitch fuse is intended to open without damage to the rest of the board and would close after the current load has been reduced to be within the specified limits.  While the polyswitch fuse is open, the rest of the board should function normally excluding the 5V pins on the affected connector.

NI has observed in the past that prolonged shorts (>1000 hours) to polyswitch fuses might cause permanent damage to the fuse.  The "arcing or flame" mentioned in the linked article only applies to older revisions of certain devices with unprotected polyswitch fuses (all customers who purchased these products were notified of the behavior).  In the case of the PXIe-6363, the polyswitch fuses are protected by the slow blow fuse on the 12V rail as well as the 12V to 5V switching power supply.  Extended shorts have the potential of opening the 12V fuse which would simply render the entire device unusable.  If the 12V fuse is blown, the device should be sent to NI for repair since other components on the device might have sustained permanent damage.  The failure of the polyswitch fuse could also lead to damage of the switching power supply which would also render the board unusable.  In either case, arcing or flame would not be observed since the current would be limited by the failure of either the 12V fuse or the switching power supply.

Best Regards,