Question



The following is additional information regarding Invitation to Bid # SCL-1419 – titled Cedar Falls Units 5 & 6 Exciter Systems Replacement – RE-BID released on 02/20/2018. The due date and time for responses is 03/15/2018 2PM (Pacific). This addendum includes both questions from prospective proposers and the City’s answers and revisions to the ITB. This addendum is hereby made part of the ITB and therefore, the information contained herein shall be taken into consideration when preparing and submitting a bid.

|Item # |Date Received |Date Answered |Vendor’s Question |City’s Answer |ITB Revisions |

|2 |02/20/18 |02/22/18 |Can we assume that answers provided to questions under |No. This should be treated as a new, separate ITB. | |

| | | |the original ITB apply if they are still applicable? | | |

|3 |02/20/18 |02/22/18 |The preferred layout mixes DC power cables and LV |The DC field leads in the existing system are routed | |

| | | |controls in cubicle 3. Please advise if this is the |through floor-mounted conduit within the cabinets then | |

| | | |goal for the new excitation system? |enters embedded conduit below Cubicle 3 that runs out | |

| | | | |to the generator. The DC field leads are not exposed | |

| | | | |within Cubicle 3. The goal of the new excitation system| |

| | | | |is to reuse the existing embedded conduit. | |

|4 |02/20/18 |02/22/18 |Please provide the following details of the existing |SCL intends to install new DC field leads. | |

| | | |and to be –reused DC field leads, i.e., number of | | |

| | | |cables per phase, diameter of cable, length (or slack) | | |

| | | |of cables once they enter the cabinet 3 through the | | |

| | | |floor. | | |

|5 |02/20/18 |02/22/18 |Please advise location of the control cable termination|Control cable termination within Cubicle 3 is located | |

| | | |in cubicle 3, i.e., top half or bottom half and how |on the rear panel, lower-right side. No slack is | |

| | | |much slack is available. |available. | |

|6 |02/20/18 |02/22/18 |Can you confirm if there is back access to the cabinet |There is no back access. | |

| | | |line-up? | | |

|7 |02/22/18 |02/23/18 | | |Correction: An error was discovered on ITB page 13. The|

| | | | | |Letter of Commitment for Contract Bond in Section 7, |

| | | | | |Item 2 is removed. |

|8 |02/22/18 |02/23/18 |What is the difference between Minimum Qualification #2|MQ #2 establishes a minimum qualification for the | |

| | | |and #3? |bidder. MQ #3 establishes a minimum qualification for | |

| | | | |the proposed excitation system. | |

|9 |02/22/18 |02/23/18 |Model validation testing for the turbine/governor is |The governors for Units 5 and 6 are Woodward Gateshaft | |

| | | |required. Please supply information about the unit’s |Type HR, circa 1920’s. | |

| | | |governor. | | |

|10 |02/22/18 |02/23/18 |What is the expected bid award date? |Award is expected the week of March 26th. | |

|11 |02/22/18 |02/23/18 |Is there flexibility in the cubicle layout? |There was significant discussion regarding this |Section 7.2 is amended to read: |

| | | | |question, and some incorrect information may have been |1. The allowable dimensions and DC field lead exit |

| | | | |provided. SCL discussed internally after the meeting |locations are shown in Appendix A. |

| | | | |and decided to allow flexibility in cubicle layout |2. The excitation system cubicles including the PPT |

| | | | |provided the maximum allowable dimensions are observed |shall not exceed 144.4”W x 36.5”D x 90.6”H. |

| | | | |as well as the requirement to retain the usage of the |3. Cubicles may be arranged at the Vendor’s preference.|

| | | | |DC field lead exit locations. Edits to the |For example, the PPT cubicle may be located on the left|

| | | | |Specification document and Appendix A have been made. |or right side. |

| | | | |Also, we revised the specification document. Both |4. Door width shall not exceed 36”. Doors shall be |

| | | | |Appendix A and the specification document are embedded |located on the front of cubicles only. Door hinges may |

| | | | |in the column to the right. |be located on the left or right as needed. |

| | | | | |Section 7.5 is amended to read: |

| | | | | |1. The cables connecting the PPT primary to the |

| | | | | |generator will enter from the top of the PPT cubicle. |

| | | | | |2. The DC output cables to the generator field winding |

| | | | | |exit from the bottom of the cubicles into embedded |

| | | | | |conduit in different locations for Unit 5 and Unit 6. |

| | | | | |See Appendix A for approximate locations. Vendor shall |

| | | | | |provide means to retain usage of the embedded conduit |

| | | | | |regardless of changes to the cubicle dimensions. |

| | | | | |3. Control wiring will enter from the top of the |

| | | | | |Control and Regulator cubicle. |

| | | | | |4. Pass throughs for internal wiring will be located |

| | | | | |between cubicles as needed. |

| | | | | |5. With the exception of customer-connected field |

| | | | | |wiring, DC output cables to the generator field |

| | | | | |winding, and PPT primary cables from the generator, no |

| | | | | |wiring may be run outside the cubicles. |

| | | | | |[pic][pic] |

|12 |02/22/18 |02/23/18 |Are resumes/Curriculum Vitae’s (CV) required to satisfy|Yes. | |

| | | |Minimum Qualification #5? | | |

|13 |02/28/18 |03/01/18 |Since the installation is no longer part of the |No permits are needed. | |

| | | |vendor’s scope, can you tell us if permits are required| | |

| | | |and if so, what permits are needed? | | |

|14 |03/07/18 |03/07/18 | | |The City is revising the Bid Due Date to 03/15/2018 at |

| | | | | |2PM. |

|15 |03/07/18 |03/08/18 |A concern came in regarding the striked out verbiage in|The City is revising the specification document as |Please see the revised specification document below, |

| | | |section 2.4.2, detailed in the column to the right |follows. Please see the revised specification document |dated March 7, 2018. |

| | | |being biased towards a single supplier. So, SCL is |to the right, dated March 7, 2018. |[pic] |

| | | |revising the specification document. |Section 2.4.2 ‘Applicable Standards’ is amended as | |

| | | | |follows: | |

| | | | |The Controller will be rack mount, “drawout” | |

| | | | |construction and comply with the following agencies and| |

| | | | |Industry standards: | |

| | | | |UL Recognized | |

| | | | |CSA Approved | |

| | | | |CE Compliant | |

| | | | |ANSI/IEEE C37.90.1-1989 – Surge and Fast Transient | |

| | | | |Performance | |

| | | | |IEC 255.5 – Impulse Test | |

| | | | | | |

| | | | |Section 5.1.1 ‘Local Control’ is amended as follows: | |

| | | | |The excitation system controller will be capable of | |

| | | | |providing local control of the generator at the | |

| | | | |excitation cubicle using a local HMI, and control | |

| | | | |switches, and keypad buttons located on the controller.| |

| | | | |The controller will be designed for “through the door” | |

| | | | |mounting for convenient access. Local control inputs | |

| | | | |will be supervised by a Local/Remote control switch. | |

| | | | | | |

| | | | |Section 6.1 ‘Controller Display’ is amended as follows:| |

| | | | |A display integral to the controller is not required. | |

| | | | |The digital controller will be equipped with an LCD to | |

| | | | |read up to three generator quantities at one time. The | |

| | | | |user will have the means to define the three metering | |

| | | | |quantities desired on the LCD. Options will include: | |

| | | | |Generator voltage (average or per phase quantities) | |

| | | | |Bus voltage | |

| | | | |Generator line current (average or per phase | |

| | | | |quantities) | |

| | | | |Generator frequency | |

| | | | |Bus frequency | |

| | | | |Generator kilowatts | |

| | | | |Generator vars | |

| | | | |Power factor | |

| | | | |Apparent power | |

| | | | |Field voltage | |

| | | | |Field amperes | |

| | | | |Field temperature | |

| | | | |Auxiliary voltage input | |

| | | | |The cabinet LCD will provide the following additional | |

| | | | |indication: | |

| | | | |AVR/FCR mode status | |

| | | | |Excitation on/off status | |

| | | | |Position indication | |

| | | | |Alarm status | |

| | | | |Generator voltage set point | |

| | | | |Additional indication will be provided on the cabinet | |

| | | | |to include: | |

| | | | |Upper reference limit | |

| | | | |Lower reference limit | |

| | | | |Null balance indication | |

| | | | |Preposition | |

| | | | |PSS active | |

|16 |03/08/18 |03/08/18 | |Please note if you have submitted a bid response, want | |

| | | | |to rescind it based on the new specifications. Please | |

| | | | |contact the Bid Clerk via the information in the ITB | |

| | | | |document. Then you will need to submit a new, complete | |

| | | | |bid by the revised due date. | |

|17 |03/12/18 |03/12/18 |Some reference documents we have to provide under |The City is obligated to disclose information when it | |

| | | |minimum qualification are from third parties, e.g., |receives a public disclosure request. So, Vendors | |

| | | |WECC report. These documents are stamped confidential |should follow the instructions in the Vendor | |

| | | |by the issuer and only for the eyes of the customer who|Questionnaire. | |

| | | |paid for the report. How do I make sure that the City | | |

| | | |does not disclose this information to third parties? | | |

|18 |03/12/18 |03/12/18 |There are also documents we provide in this bid that |See number 17. | |

| | | |show how we work and what our rationales are of our | | |

| | | |success. These are business sensitive details that we | | |

| | | |cannot have disclosed. Please advise how to address | | |

| | | |this in our offer. | | |

|19 |03/12/18 |03/12/18 |The same applies to some of our technical documents. |See number 17. | |

| | | |They describe and outline our approach to address the | | |

| | | |technical challenges of the ITB and this is our | | |

| | | |propriety and not to be disclosed to third parties. | | |

| | | |Please advise how to proceed.   | | |

|20 |03/12/18 |03/12/18 |Or is it the City’s process to allow the vendor to |See number 17. | |

| | | |provide a ‘redacted version’ of the proposal in case a | | |

| | | |request is made to the city to disclose the proposal? | | |

|21 |03/12/18 |03/12/18 |What is the appropriate response for a vendor located |Please check the appropriate box in the Equal Benefits | |

| | | |outside of the USA but is compliant with the equal |Compliance Section. | |

| | | |benefits? | | |

|22 |03/13/18 |03/13/18 |Is the City willing to move the delivery date from |No. | |

| | | |08/03 to 08/31? | | |

|23 |03/08/18 |03/13/18 |Section 1.03-1 of the project specification indicates |Yes. | |

| | | |that there are 3 phases, but there are only Phase I and| | |

| | | |Phase II listed below.  Can we assume that 2 is the | | |

| | | |correct number of phases? | | |

|24 |03/08/18 |03/13/18 |Section 2.1 specifies RS-485 and Modbus for control, |SCL requires Modbus over RS-485 to interface with the | |

| | | |metering and annunciation.  Is there a specific piece |Utility’s SCADA system. | |

| | | |of equipment that we must interface with that | | |

| | | |necessitates RS-485 or can we provide Modbus TCP via | | |

| | | |Ethernet? | | |

|25 |03/08/18 |03/13/18 |Section 2.4.2-C Identifies CE Mark as a requirement.  |Section 2.4.2 is amended as follows: |Please use the revised specification document below. |

| | | |Considering that CE Mark is a European standard, and |Please see the update specification document to the | |

| | | |this will be installed in the US is this an absolute |right. | |

| | | |requirement?  Similar question regarding CSA approval |The Controller will comply with the following agencies |[pic] |

| | | |as it is a Canadian standard.  Both CE and CSA may add |and Industry standards: | |

| | | |unnecessary costs. |UL Recognized | |

| | | | |CSA Approved | |

| | | | |CE Compliant | |

| | | | |ANSI/IEEE C37.90.1-1989 – Surge and Fast Transient | |

| | | | |Performance | |

| | | | |IEC 255.5 – Impulse Test | |

|26 |03/13/18 |03/14/18 |How much can the delivery date be pushed at the outside|None. | |

| | | |limits? | | |

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