Dusting SYPM10KF power modules from a Symmetra PX

[ojfsdi]

I've got a Symmetra PX 80kw with qty 9 10kw power modules.  They're all pretty dusty.

I'd like to clean them up before they fail from dust accumulation.

How long after pulling them free of their bus bars should I wait before dusting them?

I'm particularly concerned about the large capacitors having time to bleed down.

Is there an official method to discharge them in a controlled manor?

I don't want dust creating a short when I'm trying to clean them and causing a short and damaging a circuit board or soiling my pants.  I'd also like to safe all surfaces internally to touch if possible, to permit a more thorough cleaning and inspection

[al_buffington]

Hi,

For safety reasons, there is no procedure for customers to clean or service their own systems. Power Modules should only be opened by Schneider authorized field service representatives.  

[ojfsdi · Accepted solution]

Interesting you say that.  Schneider might want to tell whoever it is that manufacturers the modules then.  Because the manufacturer left a little sticker for the customer that talks specifically about the opening of power modules for servicing and states how long I should wait.  I feel pretty silly I didn't notice this earlier!

So. the answer to this one is:

APC says to wait 5 minutes after removing a Power Module, before opening that module.

I'll also note, for the benefit of fellow Symmetra owners, I have successfully used an air compressor to dust all Power Modules (one by one while they were outside the Frame)  It could take several minutes to remove all dust.

There may be areas on the circuit board where it looks like some sort of oil has spilled out, but it might not be oil, rather just dust that has really settled down.  It may be removable with the electronics cleaner "I.D. Red" by Zep.    Apply Red with one hand, and immediately after, while its still "wet", hit it with high pressure air from the compressor to remove the detritus that Red has loosened. Wear eye protection.

I did have to change the positioning of the power module during cleaning, from laying normally, to laying on each side, several times because there are places the heavier chunks of dust will settle on the sides that don't blow out when it's just sitting normally.  It of course needs to be held when it's on edge so it doesn't fall over.

Don't forget to dust on both sides of the black plastic insulator sheets.  Wash the lid with a wet rag separately from the module and its electronics.

Allow sufficient time for Red (and any moisture in the air hose) to evaporate before reinstalling the module, and I haven't had any problems from the cleaning process as described.  Hope this helps someone out there.

[al_buffington]

Hi,

The presence of the label is not an invitation for customers to open the power module. SE/APC places this label, or some variation of it, on many (probably all) of its three phase power modules. It is required for UL1778 certification. The only individuals that should open modules are authorized field service engineers and/or factory repair technicians.