03.pdf

SCHEDULE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

1. CONTRACT ID CODE

See Block #2

PAGE OF PAGES

2. AMENDMENT/MODIFICATION NO.

3. EFFECTIVE DATE

09 SEP 2009

4. REQUISITION/PURCHASE REQ.NO.

5. PROJECT NO. (If applicable)

6. ISSUED BY AEDC PKE CODE FA9101 7. ADMINISTERED BY (If other than Item 6) CODE

AEDC/PKE

100 KINDEL DRIVE, SUITE A-332

ARNOLD AFB, TN 37389-1332

KAREN J. BUCKNER 931-454-4405

karen.buckner@arnold.af.mil

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code) (X) 9A. AMENDMENT OF SOLICITATION NO.

FA9101-09-R-0024

X 9B. DATED (SEE ITEM 11)

17 AUG 2009

10A. MODIFICATION OF CONTRACT/ORDER NO.

10B. DATED (SEE ITEM 13)

CODE FACILITY CODE

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended, X is not extended.

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted; or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER.

If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATION OF CONTRACTS/ORDERS,

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

(X )

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: ( ) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER NO. ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

The purpose of this amendment is to incorporate Attachment 4, Questions and Answers.

Proposal due date remains unchanged on 17 Sep 09 at 2PM CST.

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print). 16A. NAME AND TITLE OF SIGNER (Type or print)

KAREN J. BUCKNER

15B. CONTRACTOR/OFFEROR 15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 16C. DATE SIGNED

(Signature of person authorized to sign)

BY________________________________________

(Signature of Contracting Officer)

NSN 7540-01-152-8070 30-105 STANDARD FORM 30 (REV.10-83)

PREVIOUS EDITION UNUSABLE Prescribed by GSA ConWrite Version 6.11.1 FAR (48 CFR) 53.243 Created 09 Sep 2009 1:20 PM

FA9101-09-R-0024

Variable Electric Power Pack/High Power Rectifier System

Questions and Answers 9 September 2009

1. We are going to quote a DC power supply, do you require pf correction? Also do you have a THD requirement for the AC side?

The power supply is to be installed in Silver Spring, Maryland where the electric utility provider is Potomac Electric Power Company (PEPCO). We have an inquiry in with PEPCO but have not yet heard back from them. We don’t have much experience in this area as we don’t operate any SCR type equipment.

2. The pf on a rectifier is not bad at full load, about .9 but when you run down in the lower voltage and current ratings the power factor could drop to .5 the other consideration is the percentage of load that this rectifier is compared to your total energy use, if it's on the small side then there should be no concern, but if it's the biggest piece of equipment then that's different.

We would not be operating the power supply for any significant length of time at low voltage & current. We would be moving up & down to/from full power as quickly as the equipment will safely allow.

This power supply will be a small fraction of the total energy use on the site.�

3. As far as THD we are going to provide you with a 12 pulse rectifier which is better than a 6 pulse, typical THD on a 12 pulse is 12% as compared to 30% on a 6 pulse so I think you are ok with this but just wanted to ask?

Again, we don’t have much experience with SCR type equipment here so until we get a response from PEPCO we don’t have any specific comment. We understand that the 12-pulse unit would tend to generate less harmonic distortion than the 6-pulse unit. I’m assuming that PEPCO’s THD criteria will be similar to other area utility companies where you may have provided equipment and they will recommend and/or require that some filtering/buffering equipment also be utilized.