VFD & Soft Starter Replacements

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Agency: Mobile Water Service System(MAWSS)
State: Alabama
Level of Government: State & Local
Category:
  • 29 - Engine Accessories
Opps ID: NBD16874491815259174
Posted Date: Dec 11, 2023
Due Date: Dec 21, 2023
Solicitation No: IFB 23-058
Source: Members Only

VFD & Soft Starter Replacements

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Joyce Sawyer, Buyer II
(251) 694-3110 Office
jasawyer@mawss.com
INVITATION FOR BID
December 11, 2023
Mobile Area Water and
Sewer System
4725 Moffett Rd Suite A
Mobile, AL 36618-2236
PO Box 180249
Mobile, AL 36618-0249
INVITATION FOR BID NUMBER
IFB 23-058
NAME OF BID
BIDS WILL BE RECEIVED AT
BID OPENING DATE
VFD & Soft Starter Replacement
MAWSS Bid Box
Donaghey Business Entrance
4725A Moffett Road
or
Mobile, AL 36618
December 21, 2023
PO Box 180249
BID CLOSING TIME
10:30 am Central Time
AWARD WILL BE MADE BY
MATERIAL DELIVERED TO
ADDITIONAL INFORMATION CONTACT
Total Cost & Lead Time
MAWSS – Lift Station Department
1610 Shelton Beach Road Ext
Mobile, AL 36618
Terry Herman (251) 378-3509 Email: therman@mawss.com
APPLICABLE DBE POLICY
None
Sealed bids must be in the Purchasing Department no later than the time specified in order to be considered. Submissions
received after the deadline will not be considered. Envelopes must bear the name of the supplier, company address and the
words “IFB 23-058 VFD & Soft Starter Replacement” or “IFB 23-058 NO QUOTE.” Facsimile or email bids will not be accepted.
All bids must be submitted on the attached forms or your bid will be disqualified. Bidder shall furnish all the information
required by the solicitation. The bidder’s name must be typed or printed on the bid sheet, and signed by the bidder or
appropriate authorized executive officer of the bidder’s company. Bidders must initial any changes or erasures. Bidders should
retain a copy of bids for their records.
Bidders shall acknowledge receipt of all addenda to this solicitation by signing and returning each addendum or by identifying
the addendum number and the date on the bid form. Failure to acknowledge receipt of any addendum by a bidder will result
in rejection of the bid if MAWSS determines that the addendum contains information that materially changes the requirements.
All bids shall be quoted FOB Destination, freight prepaid with no additional charges. Unless otherwise specified in the bid, all
prices will be on a firm-fixed price basis and are not subject to adjustments based on costs incurred. MAWSS reserves the right
to reject any or all bids submitted, to waive any informality in any bid or in the bid process, or to terminate the bid process at
any time, if deemed by MAWSS to be in MAWSS’s best interest.
A Purchase Order and this “Invitation for Bid” with “Specifications,” “Conditions,” “Bid Form,” signed by the successful bidder’s
authorized representative, and all attached drawings and other documents furnished by MAWSS to the bidders with the
Invitation for Bid in order to illustrate the contract requirements, will constitute a contract for the goods and/or services to be
purchased.
IFB 23-058 VFD & Soft Starter Replacement
Page 1 of 14
IFB 23-058 VFD & SOFT STARTER REPLACEMENT
CONDITIONS
The Board of Water and Sewer Commissioners of the City of Mobile will accept bids to purchase VFD & Soft Starter
Replacements in our Purchasing Department Bid Box located at 4725 Moffett Road Suite A, Mobile, AL 36618 no later than
10:30 a.m. local time on December 21, 2023. Award will be by Total Cost & Lead Time. The bidder offers and agrees, if this
bid is accepted, to furnish the items as defined in the specifications for the unit price set opposite each item. Pricing shall be
FOB Mobile, Alabama. All items shall be delivered to our Lift Station Dept. located at 1610 Shelton Beach Rd. Ext., Mobile, AL
36618, or to the job site as needed. The bidder shall state the expected length of delivery time on the Bid Form.
Bidder understands and agrees that manufacturer and part numbers are provided for descriptive purposes only. Items of equal
or better quality will be considered but must be approved by MAWSS in writing. Upon delivery, if the quality, durability or
performance of any product represented as equal or better is determined by MAWSS to be unsatisfactory, MAWSS will require
a suitable substitute or will require that the originally specified item be delivered, at the unit price originally offered by bidder.
No substitution for items to be provided pursuant to this contract shall be permitted during the contract period without the
express written consent of MAWSS. All items provided shall be for commercial use and for the purposes reflected in the
contract documents.
No bid on closed out or discontinued item(s) will be accepted. Item(s) that have a determinable shelf life must be disclosed at
the time of bid submittal. Bidder understands that his/her bid shall be good and may not be withdrawn for a period of sixty
(60) calendar days after the scheduled closing time for receiving bids.
Bidder understands and agrees that quantities will be purchased by MAWSS on an “as needed” basis to replenish inventory.
MAWSS shall not be committed to the purchase of a pre-established minimum quantity for any one item.
A bidder may not modify its bid after bid opening. Errors in the extension of unit prices stated in a bid or in multiplication,
division, addition or subtraction in a bid may be corrected by the MAWSS Purchasing Buyer prior to award. In such cases, unit
prices shall not be changed.
It is the responsibility of the bidder to determine prior to the bid opening whether any amendment, additions, deletions or
changes of any type have been made to this Invitation for Bid, Conditions, Specifications, Bid Form or any of the or bid
documents. Bid documents and any amendments made to this bid will be posted on our website at www.mawss.com.
Invoices are to be emailed to Accounts Payable at AcctsPayable@mawss.com.
END OF CONDITIONS
IFB 23-058 VFD & Soft Starter Replacement
Page 2 of 14
IFB 23-058 VFD & SOFT STARTER REPLACEMENT
DESCRIPTION
This bid is for:
Center St LS 209 Variable Frequency Drive (VFD) and Soft Starter Replacement
• Two (2) Danfoss VFDs FC-202N132T4E20H2XGC7 XXSXXXXXAXBXCXRXXDX, 200 HP, 380-480 VAC, Three Phase.
• Class C3C conformal coating shall be applied to the PCBs to protect against corrosion and H2S.
• Two (2) Danfoss Soft Starters MCD60287BT5S2X00CV2, 150 HP, 200-525 VAC, Three Phase with internal Bypass
Contactor, 110 vac & 220 VAC control voltage, frame size #2. All soft starters shall be equipped with 3 SCR’s
• The equipment shall mount into the existing panels.
• There shall be a 6-year on-site warranty on the VFD’s and a 6-year on-site warranty on the soft starters. Startup,
programing and commissioning of equipment shall be included in the pricing.
• Because Center St LS 209 will be online when the equipment is installed, only one installation shall be completed at a
time. Startup, programing and commissioning will be completed after each installation.
END OF DESCRIPTION
IFB 23-058 VFD & Soft Starter Replacement
Page 3 of 14
IFB 23-058 VFD & SOFT STARTER REPLACEMENT
SPECIFICATIONS
13.4.10 MOTOR STARTERS AND CONTROLLERS
A. Full-voltage motor starters shall be UL listed and NEMA rated for the associated motor.
B. Reduced voltage motor starters shall be “soft-start” type manufactured in accordance with UL 508
with the following aspects:
1. 24-volt DC internal control voltage
2. Either internal or external power supply
3. Internal by-pass contactor to prevent control component overheating
4. Dry type discrete input and output control circuits
5. Electrical overcurrent protection with alarm indicator
6. Starting failure with alarm indicator
7. Phase rotation protection with alarm indicator.
8. Phase failure protection with alarm indicator
9. Voltage unbalance protection with alarm indicator
10. All soft starters shall be equipped with 3 SCR’s
C. Operational and Performance Ratings:
1. Voltage, phase, and frequency of the associated motor.
2. Horsepower rating adequate for the associated motor.
3. Ampere capacity adequate for the associated motor.
4. 0.5 to 180 second adjustable time ramp for motor acceleration and deceleration.
5. Adjustable 30 to 100 % overload range.
D. Due to on-going refinements/improvements of variable frequency drives, the operational
performance ratings shall be selected to suit the unique requirements of the associated specific
pumping units to be controlled and approved by a MAWSS Engineer.
13.4.11 VARIABLE FREQUENCY DRIVES
A. Scope of Work
1. General: This specification defines the minimum requirements for Variable Frequency
Drives (VFD) and accessories for speed control of either constant or variable torque loads.
2. Related Work: None.
3. References:
a. UL 508C
b. CE
c. NEC
d. Canadian Underwrites Laboratory (CUL)
e. ISO 9001
f. IEEE519-1992
IFB 23-058 VFD & Soft Starter Replacement
Page 4 of 14
B. Products
1. Acceptable Manufacturers:
a. Danfoss VLT® AQUA Series
C. General:
1. Furnish complete VFD as specified herein or in the equipment schedule for loads designated to
be variable speed. VFD’s shall be user-selectable for either constant or variable torque loads.
2. The VFD shall convert incoming fixed frequency three-phase AC power into a variable
frequency and voltage for controlling the speed of three-phase AC induction motors. The
VFD shall be a six-pulse input design, and the input voltage rectifier shall employ a full wave
diode bridge; VFD’s utilizing controlled SCR rectifiers shall not be acceptable. The output
waveform shall closely approximate a sine wave. The VFD shall be of a PWM output design
utilizing current IGBT inverter technology and voltage vector control of the output PWM
waveform.
3. The VFD shall include a full-wave diode bridge rectifier and maintain a displacement power
factor of near unity regardless of speed and load.
4. The VFD shall utilize an output voltage-vector switching algorithm, or equivalent, in both
variable and constant torque modes. Shall provide rated RMS fundamental voltage from the
VFD. This allows the motor to operate at a lower temperature rise, extending its thermal life.
VFD’s that cannot produce rated RMS fundamental output voltage or require the input voltage
to be increased above motor nameplate value to achieve rated RMS fundamental output voltage
are not acceptable. VFD’s that utilize Sine-Coded PWM or Look-up tables shall not be
acceptable.
5. The VFD selected must be able to source the motor’s full load nameplate amperage
(fundamental RMS) on a continuous basis, and be capable of running the motor at its nameplate
RPM, voltage, current, and slip without having to utilize the service factor of the motor.
6. The VFD shall offer a programmable motor parameter that allows the total number of poles of
a motor to be programmed to optimize motor performance.
7. VFD shall automatically boost power factor at lower speeds.
8. An automatic energy optimization selection feature shall be provided in the VFD to minimize
energy consumption in variable torque applications. This feature shall optimize motor
magnetization voltage and shall dynamically adjust output voltage in response to load,
independent of speed. Output voltage adjustment based on frequency alone is not acceptable
for single motor variable torque configurations.
9. An initial ramp function shall be available to provide a user-selectable ramp, up to 60 seconds,
for applications requiring a faster or slower ramp than the normal ramp.
10. An Autotuning PI controller output feature shall provide automated PI controller settings.
Once the user accepts the settings, the VFD will save the settings to memory.
11. VFD shall offer a motor spinning test that will run the motor at 5 Hz until the OK button is
pressed. This feature will allow the user to determine if the motor is running in the correct
direction.
12. Switching of the input power to the VFD shall be possible without interlocks or damage to the
IFB 23-058 VFD & Soft Starter Replacement
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