Specifications include, but are not limited to: The University wishes to procure a variety of Variable Frequency Drives and Motor Controllers for campus use. Given the time sensitive need for as well as the continuous improvements being made to Variable Frequency Drives and Motor Controllers, the University anticipates the need for products that may not be specifically listed on the Itemized Bid List. As such, the University intends this to be a multi-year Contract where additional/future product needs are satisfied on a quote to order basis and/or discount off list with awarded vendor(s). Service and/or maintenance of this equipment may be required. Contractors must have access to replacement parts within 5 days to service all machines identified under this bid. Service calls received after noon must be acknowledged by noon of the next business day and the machine must be serviced within 8 hours of initial call. The service representative shall leave the ordering department a copy of a dated, written report indicating the service performed. This report must be signed by the University employee in charge of the machine. Contractor must complete all maintenance or repair services within 2 weeks of the initial call. If Contractor cannot complete all services within this time, the Contractor must provide a progress report of the repair to the department. The service representative shall leave with the ordering department a copy of a dated, written report indicating the service performed. This report must be signed by the University employee in charge of the machine. The unit shall be variable torque. The unit shall be U.L. listed, solid state, microprocessor-based with a pulse width modulated (PWM) output wave form (none others are acceptable). The Variable Frequency Drive (VFD) shall employ a full wave bridge rectifier and capacitors to minimize the ripple of the rectified voltage to maintain near constant DC voltage. Insulated gate bipolar transistors (IGBT’s) shall be employed as the output switching device. The VFD package shall contain the equivalent of 5% impedance to reduce harmonic distortion. The 5% equivalent impedance shall be provided in the form of a DC bus choke, an input AC line reactor in each phase, or a combination of the two methods. Control circuitry shall be plug-in, plug-out modular basis with a corrosion resistant coating on printed circuit boards. Units to be suitable for an operating environment from 0°C to 40°C temperature and humidity up to 90% non-condensing. Include the following operating and monitoring devices mounted on the front cover: A disconnect switch or circuit breaker to de-energize both the drive and bypass circuit with door interlocked handle and lock-open padlocking provisions. Operating mode selector switch marked "hand-off-auto". Manual speed adjustment via keypad, mounted on the door. Manual bypass selector switch to select power through drive or bypass (if a bypass is provided). Provide a manual bypass circuit and bypass starter to transfer from variable frequency drive operation to bypass operation (if a bypass is provided). Output power shall be suitable for driving standard NEMA B design, three phase alternating current induction motors at full rated speed with capability of 6:1 turndown. Additional performance capabilities to include the following: Ride through a momentary power outage of 15 cycles ; Start into a rotating load without damage to drive components or motor
