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Publication Title | Reconfigure Corner Grounded Delta Configuration

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Telephone: (818) 734-5300 • Facsimile: (818) 734-5320 • Website:

Service Bulletin SB0047

Date: From: Subject:

December 2002

Capstone Technical Support

Reconfigure Corner Grounded Delta Configuration

Systems Affected

All C30 Standalone with a Battery Controller Transient (BCT) connected in a corner- grounded Delta configuration.

Description of Problem

A C30 Standalone system operating in a corner-grounded Delta electrical configuration creates high levels of common mode voltage to components within the C30 Battery Controller Transient (BCT). These large voltages can cause excessive heating of board level components - ultimately resulting in premature failure of multiple MicroTurbine components or collateral failure of components in MultiPac-connected systems.

The result of ineffective grounding creates a failure from the high voltage bus to the low voltage bus on the BCT Power Board. Secondary failures of the Digital Power Controller (DPC) Control Board, Personality Modules (PMs), and other low voltage components will also occur.

MicroTurbine Connections


Circuit Disconnect



L2 L3







Figure 1. Existing Corner Grounded Delta-to-Wye Configuration

450012-001 Rev A (December 2002) Page 1 of 3 SB0047

This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.

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