Installing The Pcs Onsite; Battery Ground Fault Concerns - Delta 100kW PCS Installation Manual

Installing the PCS Onsite

The PCS Series must be located in weather-proof enclosure or enclosed-area. The PCS is not
intended or designed for exposure to water or excessive dust.
The PCS system is designed to support the requirements of various environments.
The PCS must be in an upright position at all times.

The PCS functions at optimal operating performance if installed in a temperature range of -20°C

to 25°C (32°F to 77°F).
The specifications are available in "Specifications" on page 61.
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Safety Considerations
The following safety information is intended to reduce the risk of accidents:
Keep the floor around the PCS clean to prevent metallic dust, iron or other metal filings from

being drawn inside the device, consequently causing short circuits.
Closed area installations:
The floors and surrounding area around the PCS must use non flammable material.

A portable powder fire extinguisher must be installed within easy reach of the PCS.
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An automatic fire extinguishing system should be installed and enabled for the site.
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Access to the installation site should be restricted to qualified service personnel.


Battery Ground Fault Concerns

The following are concerns surrounding potential risks of DC ground faults and the possible causes.
WARNING!
!
To prevent possible escalation into serious or catastrophic ground faults, make sure to equip
the corresponding Ground Fault Detection (GFD) equipment and follow strict maintenance
guidelines.
The primary concerns with any Battery Ground Fault include three principle areas:
1. Fire due to ground fault.
2. Risk to personnel due to ground or battery fault.
3. Risk to system reliability due to ground fault.
Causes of Battery Ground Faults
There are several causes for introducing a ground fault into a battery system. The following presents
the most common causes for ground faults.
Debris on the surface of the container- Dirt and debris on the surface of the battery can develop

paths for tracking to the battery rack.
Maintenance activities can place residual electrolyte on the container, which can enhance the

conduction path created by the debris exacerbating the level of ground fault.
Penetration in the container- issues such as cracks by stress or holes by penetration in the

container create an opportunity for electrolyte to seep out of the container and contact the
battery.
Installation Manual 15
Installation