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UPS Maintenance

When doing maintenance on an Uninterruptible Power Supply and its auxiliary equipment, keeping it clean is one of the main objectives. Dirt, dust, sawdust, and metal filings are just some of the pollutants that technicians see in UPSs, even when installed in seemingly clean environments. These substances can cause failures when they contaminate the contacts of relays and contactors, and conductive material can cause short circuits and malfunctions on printed circuit boards (PCBs).

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At least once a year, make sure your UPS gets cleaned including a good vacuuming with a non-conductive hose and attachments. Never use a blower or compressed air! These methods can blow contaminants deeper into the unit, causing real troubleshooting headaches if and when they finally do cause issues.

Use lint-free rags lightly damp with a nonflammable and fast-drying solvent for heavy deposits, and soft brushes around delicate components and connectors. Always perform cleaning work on equipment that is offline, and de-energized and with the proper personal protective equipment (PPE) such as goggles, gloves, aprons, and respirators as necessary. Lastly, always use a torque wrench on copper and lead connectors

Suggestions marked ///\\deruth (Mechanical) Oct 6,
We manufacture a semiconductor wafer metrology tool, for installation in fabs in the USA, Europe, and Japan. Thus we must meet not only NEC, but CE requirements (machine directive, low-voltage directive), and SEMI S2/S8 safety guidelines. (Not sure if they are all pertinent to my question, but I mention it for completeness).
///What about the product bearing some testing laboratory label(s), e.g. UL, FM, etc.? Have you been looking into this one?\\
I'm trying to determine if our equipment is required to have a MCCB (molded case circuit breaker) at the AC-facility inlet to the tool, versus using a supplementary protector. Currently we are using an Altech V-EA "Miniature Circuit Breaker", model 2DU20 (20 Amp). The manufacture has confirmed that this is a Supplementary Protector, and NOT a MCCB.
///This might be determined by the testing and certifying laboratory. It is difficult to address this without seeing the schematic and wiring diagrams.\\
In our design, the AC facility power (either 120 VAC or 230VAC, single phase), comes into our machine, is routed directly to this Altech supplementary protector, before being routed directly to our power-distribution box (PDU). The PDU is jumpered for either 120 or 230VAC input, provides EMO/EPO and remote on/off capability, and also has a step-down torroidal transformer with a 120VAC secondary, to provide 120VAC for distribution throughout our tool, via multiple 120VAC fused outlets.
///This is where the electrical power consumption, short circuit level, safety, grounding, etc. begin to surface. The supplementary protectors are meant to be downstream protectors from MCCB or fuses with relatively small loads to protect and under relatively low short circuit currents.\\The PDU provides fused power to multiple devices, including computer and lamp power supplies, a robot controller, an AC blower motor, and an AC impeller motor.
///This suggests an MCCB or Fuse protection rather than MCB, unless the electrical consumption is relatively low.\\My Questions:
1) Is it acceptable to be using a supplementary protector in this application? Or should we be using a MCCB to be compliant with NEC and/or Low-Voltage Directive codes?
///It depends, MCCB will be safer than MCB but the MCB may suffice.\\2) Do the NEC and/or Low-Voltage Directive codes require having Ground-Fault Protection
///Yes, when it comes to the equipment grounding, if covered by conductive metals. Ground fault circuit interrupter (circuit breaker) is considered safer than a regular circuit breaker; especially, when it comes to wet locations, and various conductive metallic surfaces around the machine/tool.\\ in the tool in conjunction with the main circuit breaker, and if so can a MCCB provide the Ground-Fault Protection?
///Yes, it has to be GFI circuit breaker.
There may be some similar product discussed or documented on Web.\\\

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