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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 0038

Date: From: Subject:

Affected

All contactor-based Dual Mode Controllers (DMC’s) supplied by Capstone Turbine Corporation.

Safety Precautions

Only Capstone Authorized Service Providers (ASP’s) should open the MicroTurbine and other equipment connected to the MicroTurbine. The systems can include multiple sources of power. Observe and adhere to the Safety Instructions contained within the MicroTurbine manuals.

Summary

The screws that attach the wire terminals to the Contactor (M1) in the Dual Mode Controller may become loose during shipping or installation. Intermittent annunciation of utility/load faults (for example, 7010 fault) from the MicroTurbine would be a likely indication that this condition exists.

Loose connections can cause intermittent voltage and high current levels to conduct through the main power wires attached to the Contactor terminals. High temperature levels can result in the melting of wire insulation and could lead to further failures.

Power for the main Contactor is provided from wires connected to the utility input side of the Contactor. Loose connections can also cause intermittent voltage to the Contactor coil resulting in “Contactor buzzing” or failure to close.

Capstone requires that Dual Mode Controllers with Part Numbers 509921-XXX and 510594-XXX through 510600-XXX be inspected to ensure that the terminal screws and wire connections are tightly secured during next scheduled visit. Torque requirements on the Contactor terminals are as follows:

June 2002

Capstone Technical Support

Inspect Dual Mode Controller Terminal Connections

DMC Part Number

Contactor Terminal Torque Setting

DMC Part Number

Contactor Terminal Torque Setting

Nm

Lb-in

Nm

Lb-in

509921-XXX

1.5 – 3.5

13 –31

510597-XXX

42

375

510594-XXX

16.9

150

510598-XXX

42

375

510595-XXX

16.9

150

510599-XXX

31

275

510596-XXX

31

275

510600-XXX

31

275

If you have additional questions, please contact: Capstone Technical Support

Telephone:

Toll Free Telephone:

450002-001 Rev A (Jun 2002)

(818) 407-3600 (877) 282-8966

Facsimile: (818) 734-1080

E-mail: service@capstoneturbine.com

Page 1 of 1

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 equipment 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.

SB0038

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