Questions_and_Answers_0001.pdf
PDF 431 KB Posted
- Attached to
- AP6491 PAL BRIDGE CRANE MAIN HOIST VFD R
- Solicitation number
- 140R1024Q0012
About this file
This document consists of Questions and Answers related to a federal contract opportunity for the replacement of a bridge crane main hoist VFD (Variable Frequency Drive) and DBU (Dynamic Braking Unit) at the AP6491 facility.
The key details are:
- This is a brand-new contract, with no incumbent vendor currently performing these services.
- The main hoist has a previously installed VFD system that has internal boards that have failed and are no longer supported by the manufacturer due to the age of the VFD.
- An existing festoon cable system is in place between the bridge and trolley, which the contractor is expected to propose a replacement design for.
- The mechanical load brake is still enabled when the load is stationary, and the VFD is used during load movement.
- The main hoist is controlled by an OEM single axis controller type MS2 located in the cab. The solicitation number is 140R1024Q0012, and the procurement is being conducted by the Department of the Interior Bureau of Reclamation.
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Other files
| File | Type | Posted |
|---|---|---|
| Sol_140R1024Q0012_Amd_0001.pdf | ||
| 140R1024Q0012_.pdf |
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Text version
Q1. We would like to know if this is a brand new contract OR if there is (was) an incumbent performing these services. If not brand new, could you please provide the current / previous contract number?
A1. This is a brand new contract, so there is no incumbent or current/previous contract number to provide.
Q2. Statement of Work sec on 4.2 and the Rosa Automa on drawing appear to indicate that the main hoist has a previously installed VFD system. Please confirm if this is correct.
A2. Yes
Q3. If the main hoist has a previously installed VFD, why does the BOR want to replace it? Are there any known issues?
A3. Main Hoist VFD has internal boards that have failed and are no longer supported by manufacturer due to age of VFD.
Q4. Statement of Work sec on 4.3 men ons a festoon cable. Is there an exis ng festoon system between the bridge and trolley?
A4. Yes. The exis ng buswork for the bridge to the trolley is open conductor bus with collector shoes (see photo in the specifica on sec on 4.3)
Q5. If a festoon system exists, can addi onal informa on on that system be provided? What conductors are in the festoon?
A5. The existing buswork for the bridge to the trolley is open conductor bus with collector shoes (see photo in the specification section 4.3)
Q6. Can insulated conductor bars be used between the bridge and trolley instead of a festoon system?
A6. See specification section 4.3, Contractor to “Propose to the Government the replacement design for approval”.
Q7. Has the main hoist mechanical load brake been disabled for use with the exis ng VFD vector control?
A7. The mechanical load brake is s ll enabled when the load is sta onary. The VFD is used during load movement.
Q8. What type of controller (master switch) is used to control the main hoist opera on and where is it located (in cab)?
A8. The controller (master switch) is OEM single axis controller type MS2 and is in the cab. Photos are provided below.
File details come from the government source that posted it. Updated .