32 PCS100 UPS-I User Manual
5.1.2 2200 A and 4200 A Utility Disconnect
The 2200 A and 4200 A Utility Disconnect are separate enclosures that also include the main input and output
terminals for connecting the PCS100 UPS-I to the utility and the load.
DANGER – Hazardous Voltages
An Operator must not open doors or panels marked as containing hazardous voltages. Many
parts in this product, including printed circuit boards operate at lethal voltages. DO NOT
TOUCH components or connections that have voltage present
DANGER – Arc Flash
Shorted terminals can cause arc flash resulting in severe burns, severe eye injury, blindness or
death. Use insulated tools and do not short any terminals. Wear appropriate personal
protective equipment.
The Coupling Transformer circuit breaker is also housed in the Utility Disconnect enclosure. It provides
short circuit and current imbalance protection for the coupling transformer and over voltage protection for
the inverters and energy storage.
The Utility Disconnect cooling fans run continuously.
Air intake is from front of the cabinet.
Air exhaust is through the top of the cabinet.
The front half of the Utility Disconnect Enclosure is pressurized which forces air through the SCR heat sinks and
out the top of the enclosure.
The Utility Disconnect Enclosure includes internal pressure monitoring. Reduced air pressure, will result in a
warning on GDM (or Modbus/TCP).
Reduced pressure on UD will be result of:
– Fan failure
– Dirty air filters
– Opened UD enclosure doors
SCR stack
Coupling
Transformer Circuit
Breaker
Figure 5-3: 2200 A and 4200 A Utility Disconnect Enclosure
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