Failed PSUs

[coolsparx]

I have a DS-7608NI-K2-8P & 6DS-2CD2345FWD-I 4mm 4MP cameras, it is about 3 years old.

Last month the RCBO tripped & I worked out the PSU had failed, I couldn’t locate another so I ordered a replacement NVR. Time was tight to setup the new NVR so I took the new PSU out & put it in my old NVR.

Unfortunately it went again last night. I have ordered another NVR & a Belkin surge protected 4 way extension lead. I plan to install the new NVR with existing HDD, guessing I will have to reformat the drive & may need to reset the cameras.

I will obviously need to get 1 or 2 new PSUs, should I order them from Hunterfield or return the NVRs to Hikvision through my wholesaler for repair?

Does anyone know what might have caused the 2 PSU failures?

 

[Gargoile]

Have you tested the outlet with a voltage meter? Under voltage will cause failure more than over voltage.

Try to use a UPS to protect your hardware.

 

[coolsparx]

Have you tested the outlet with a voltage meter? Under voltage will cause failure more than over voltage.

Try to use a UPS to protect your hardware.

Thank you, I will check the voltage, would it be a quick drop or sustained?

Do you have any recommendations for UPS or are they all similar?

 

[IAmATeaf]

If something is killing the PSU then as suggested check your mains coming in to confirm it’s within spec or most likely there’s an issue with the NVR that is killing the PSU and in turn tripping the breaker.

 

[alastairstevenson]

I will obviously need to get 1 or 2 new PSUs, should I order them from Hunterfield or return the NVRs to Hikvision through my wholesaler for repair?

If it's a power supply replacement as opposed to a supplier warranty repair, Hunterfield will be much the cheapest option.
They are even much cheaper than the same item via Aliexpress.

I've fault-found and fixed up several of the CWT versions of these power supplies, and one of the Delta variant.
Typical faults are failure of one or more of the power components, usually the n-channel power MOSFETs.
All these designs are short-circuit and overload protected, so it's unlikely that what they are connected to would kill them.
Speculation would be an unhandled mains transient, but if you'd had a local thunderstorm you'd have known about it.

I would recommend that anyone not experienced in high-voltage DC circuitry must not attempt any fault-find or repairs of these.

If you end up with a couple of failed PSUs I'd be interested to have a poke around them for curiosity.

 

[Gargoile]

Thank you, I will check the voltage, would it be a quick drop or sustained?

Do you have any recommendations for UPS or are they all similar?

It's the longer sustained drops ( brown outs) that do the most damage.

Also as stated the issue can be in the NVR itself. There could be an issue with the circuit board that wasn't soldered correctly. ( over solder on the board making a ground short). If your power to the NVR is clean/stable, then it points to the NVR. I don't think you have tin whiskers that are causing any issues.

 

[looney2ns]

A good quality UPS should always be used on any NVR, or PC for that matter.
I've always had good luck with APC.
They have saved my bacon more than once.