Basic Documentation

Disclaimer: These are sample drawings and sequences. Designers are responsible for
finalizing the content for their particular projects.
8. The VFD shall include capacitors which do not require conditioning prior to
installation. The VFD shall be capable on an infinite shelf life and immediate out
of box installation.
9. The VFD shall operate only when require. The user shall have the ability to
choose additional cooling fan controls.
10. The VFD shall monitor and display via the keypad nine (9) parameters at one
time without the need to scroll through multiple screens. Each parameter shall
be user defined. The following is a sample of the parameters which can be
monitored and view via the keypad. All parameters viewed from the list below
shall be capable of being displayed at all times. The display shall be in complete
English words (alpha-numeric codes are not acceptable).
a. Output Frequency Motor Speed (RPM, %, or Eng units)
b. Motor Current Calculated Motor Torque
c. Calculated Motor Power (kW) DC Bus Voltage
d. Output Voltage Heatsink Temperature (deg F)
e. Analog Input Values Analog Output Value
f. Keypad Reference Values Elapsed Time Meter (resettable)
g. KWh meter (resettable) MWh meter
h. Digital input status Digital output status
11. The VFD’s shall include a Quick Start-up wizard that leads the user through the
most typical HVAC required parameters.
12. The VFD shall have the ability to automatically restart after an overcurrent,
overvoltage, undervoltage, or loss of input signal protective trip. The number of
restart attempts, trial time, and time between reset attempts shall be
programmable.
13. The VFD shall be capable of starting into a rotating load (forward or reverse) and
accelerate or decelerate to setpoint without safety tripping or component damage
(flying start).
14. The VFD shall also be capable of DC injection braking that can be employed to
stop a free wheeling motor prior to starting to avoid overvoltage nuisance
tripping.
15. The VFD shall have the ability to be programmed to automatically extend the
ramp-down time as required to keep the drive from tripping on over-voltage
caused by regeneration of power by the load