Download A - Rockwell Automation

A. Variable Frequency Drives (VFD’s):
1. All variable frequency drives, provided under this Division, must be
supplied by the same manufacturer and meet all specified
requirements. Contractor shall coordinate variable frequency drive
manufacturer selection with all equipment manufacturers, and shall be
solely responsible for ensuring that the individual variable frequency
drives furnished are completely compatible with all requirements and
intended functions of the driven equipment.
2. The drive shall be capable of varying the speed of a standard NEMA
Design B induction motor from a virtual standstill to the standard
speed of the motor. The unit shall transform input power into a
variable voltage, adjustable frequency three phase output of suitable
capacity and waveform.
3. Input voltage shall be as indicated on the Drawings and/or as specified
in the equipment specification sections. Frequency shall be 60 Hz.
4. Output shall be three (3) phase voltage as indicated on the Drawings
and/or as specified in the equipment specification sections.
5. The drive shall be a PWM (Pulse Width Modulated) inverter using
IGBT transistors.
6. The drive manufacturer shall have not less than ten years of experience
in the manufacture of drives in the United States.
7. The drives shall be rated for constant or variable torque applications
(460V - 1 HP to 150 HP), depending on the individual driven load
requirements.
8. Power Line Considerations:
a. The drive shall be designed to operate in accordance with all
performance requirements of the contract documents from a
power source which contains a maximum of 5% total Voltage
harmonic distortion, meet current distortion as defined by IEEE519-1992.
b. Each VFD or multiple sets of VFD’s shall be designed and
installed such that: the total voltage harmonic distortion reflected
back to the power source is a maximum of 5%.
c. When required line reactors and harmonic filters are required,
they shall be provided by VFD supplier and shall be rated for, and
compatible with, each VFD. They shall function as a complete
system. Additional harmonic filters beyond those shown on
drawings may be required in order to comply with the above
parameters. The line reactors and harmonic traps shall be
mounted inside the respective VFD enclosures. Traps shall be
fuse-protected as a minimum and shall protect internal wiring and
components on each phase and shall be current limiting. Data on
these items shall be included with VFD shop drawings.
d. The VFD supplier shall perform a computer simulated power
system study to verify compliance with the parameters as stated
herein. The results of this study shall be submitted to the
engineer. At a minimum the submitted results of this study shall
include:
1) A results summary sheet which briefly describes the power
system configuration analyzed and which states the
calculated values of total harmonic distortion.
2) Detailed list of the amplitude of harmonic currents and
voltages to the 50th harmonic.
3) This report most shows if IEEE 519 is met and where on the
power distribution.
e. The contractor shall supply the VFD supplier with all power
system data required to perform the above described study.
These data may include but are not limited to:
1) A complete one line diagram of the subject electrical
distribution system.
2) Complete electrical data on all equipment shown on the one
line diagram is required. At a minimum this data shall
consist of:
Transformers - kVA, Primary voltage, Secondary voltage,
Short circuit capacity or impedance.
Motors - Horsepower, Base speed, Full load RMS current
(FLA).
Generators - Short circuit capacity or Subtransient
reactances (Xd), Power factor, kW, X/R Ratio.
3) If the distribution system can function in more than one
configuration, the configuration(s) to be analyzed shall be
clearly defined. Any other information which may affect the
behavior of the distribution system shall also be provided.
9. Ambient Conditions:
a. Environment - Indoors, NEMA 1 enclosure with fans and filters
when required for drive cooling, unless located in space with
different NEMA rating.
b. Ambient Temperature - minus 10 degrees C to 40 degrees C
c. Altitude - Less than 3,300 feet
d. Relative humidity - 95% maximum non-condensing
e. Vibration - less than .5G
10. Control System:
a. Input power: A. Main circuit: 460V/60Hz.
B. Control circuit 120 volts
b. Tolerance: Input Voltage + 10%. Frequency + 2 Hz.
c. Control method: Sinusoidal PWM control
d. Output Voltage: 3PH 0-460 Volt.
e. Output Frequency Range: 0 Hz to 400 Hz
f. Volts/Hz characteristics:
1) Either constant V/Hz or variable V/Hz (user selectable)
2) Minimum frequency from 0-120 Hz
3) Maximum frequency from 10-400 Hz
11.
12.
13.
14.
15.
16.
17.
18.
4) Voltage boost adjustable from 0% to 30%
g. Overload current: Variable torque (Normal Duty) applications:
110% for 60 Seconds, Constant Torque (Heavy Duty)
applications: 150% for 60 seconds,
h. Analog Inputs: 4-20 mA or 0-10 volts
i. Analog Outputs: (2) 4-20 mA (speed and motor running amps)
j. Input Terminals: Minimum of eight (6) programmable
k. Output Contacts: three (3) programmable Form C contacts
rated 250V, 2 amps inductive shall be provided by interposing
relays.
l. Frequency jump - 3-point settings: Setting jump frequency (0 to
Max frequency), and width (0 to max frequency)
m. PWM carrier frequency: Adjustable from 2 kHz to 10 kHz.
The drive shall provide a minimum displacement power factor of 0.95
throughout the speed range.
The efficiency of the drive at full speed shall be a minimum of 97.5
percent.
The drive shall be provided with a circuit breaker with through-door
disconnect handle, to serve as a disconnecting means, and coordinated
with the drive protective features for the motor to form a complete
combination type starter/controller. Provide with current limiting fuses
on the input side of the drive, sized and rated as required by UL and
the drive manufacturer, so that the drive is rated for the available fault
current.
The drive shall be provided with a Motor-Protecting Output Filter
where noted in the VFD Schedule or where specifically required or
recommended by VFD manufacturer.
The drive shall be provided with an EMI/RFI filter
The drive shall contain relays, push buttons, timers, and all other
appurtenances necessary for the specific application as specified in the
equipment specification sections, and as shown on the Electrical
Drawings.
Enclosure type shall be as required for the specific application as
shown on the Drawings and/or as specified in the equipment
specification sections.
Operational Functions:
a. Acceleration/deceleration times: 0.1 to 600 seconds, 2 separate
acceleration and deceleration times.
b. Forward or reverse run can be chosen.
c. Jogging:
1) Running - 0 to 20 Hz
2). Braking - Deceleration, DC injection, or coasting
d. Multi-speed run: up to 7 preset speeds can be chosen.
e. Flying Start: The drive shall be capable of determining
the speed and direction of a spinning motor and
19.
20.
21.
22.
23.
24.
adjust its output to "pick-up" the motor at the
rotating speed.
f. Auto restart: in the event of power loss the drive must be able to
automatically restart the drive without an external reset.
g. Soft Stall: Sustains a run in overload mode.
h. Overload: Adjustable from 60 - 100%
i. Complete adjustment of parameters gives thousands of
volt/frequency patterns.
Protective Features:
a. Functions included:
Overcurrent
Overvoltage
Heatsink Overheat
Load-side Short Circuit
Load-side Ground Fault
VFD Overload
Overcurrent During Start-up
EEPROM Error
Communications Error
Auto-Tuning Error
Emergency Stop
Undervoltage
Open Output Phase
Motor Overload
b. Drive shall have an external fault trip input terminal.
c. Drive shall reset when a designated contact is closed on the
terminal strip.
Monitor Functions:
a. The drive shall have display scalar of monitoring frequency.
(Range 0.10 to 200).
b. The drive shall have an LED on the front panel showing that the
main DC circuit capacitor is charged.
Controller:
a. All parameters should be adjustable from the keypad.
b. The drive shall have a reset to factory settings.
c. The keypad shall be NEMA 12 or NEMA 1 rated and the same as
the enclosure rating.
d. The keypad shall be able to extend up to 15 feet from the drive.
f. The keypad shall allow for parameters to be changed while drive
is running.
All models shall be UL listed.
Drive shall be capable of communication through a standard protocol
which will support RS232, RS485 as standard. The drive shall be able
to communicate with at least two networks at the same time. EtherNet,
ControlNet, or DeviceNet are the preferred networks.
Drive shall be capable of PID control.
25. Drive shall be capable of speed feedback control through an optional
control board.
26. Variable frequency drive manufacturer must have a local factoryauthorized parts stocking distributor which has factory-trained service
technicians and warranty authorization; shall have 24 hour service
capabilities.