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Publication Title | Wiring Interlock between Multiple MicroTurbines with Common Exhaust Duct

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Capstone

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

Service Bulletin SB0046

Date: From: Subject:

December 2002

Capstone Technical Support

Wiring Interlock between Multiple MicroTurbines with Common Exhaust Duct

Systems Affected

All Capstone Turbine Corporation® Model C30 and C60 MicroTurbine systems operating with a common exhaust duct including systems with back flow dampers.

Safety Precautions

Only Capstone Authorized Serviced Providers (ASP’s) should open the MicroTurbine and other equipment connected to the MicroTurbine. The systems can include multiple sources of power. The fuel used by the MicroTurbine is flammable and explosive. Keep flames, cigarettes, sparks, and electrical arc-producing equipment away from the MicroTurbine. Observe and adhere to the Safety Instructions contained within the MicroTurbine documentation.

Description of Problem

This service bulletin is intended to notify Authorized Service Providers of a possible safety issue/fire hazard or component failure relating to MicroTurbine systems sharing a common exhaust duct.

The back flow damper on two or more MicroTurbine systems sharing a common exhaust duct may warp after exposure to heat. This damper failure may affect the seal that prevents exhaust back flow and cause hot exhaust from an operating MicroTurbine unit to flow backwards through a non-operating MicroTurbine unit.

Reverse flow of hot exhaust may cause overheating of the generator and engine inlet components, resulting in damage to those components. In addition, damage to the non- operating MicroTurbine can result during a start of another unit due to backpressure on the engine’s rotating components.

All MicroTurbines on a common duct must run simultaneously at the same power level. In addition, Capstone requires a wiring interlock mechanism to be installed between MicroTurbine systems.

450011-001 Rev A (December 2002) Page 1 of 4

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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