Basic Documentation

Disclaimer: These are sample drawings and sequences. Designers are responsible for
finalizing the content for their particular projects.
1. Three (3) programmable critical frequency lockout ranges to prevent the VFD
from operating the load continuously at an unstable speed.
2. A custom PID preset for HVAC & fluid systems, allow a pressure or flow signal to
be connected to the VFD, using the microprocessor in the VFD for the closed
loop control. The VFD shall have 100 mA of 24 VDC auxiliary power and be
capable of loop powering a transmitter supplied by others. The PID setpoint shall
be adjustable from the VFD keypad, analog inputs, digital inputs, or over the
communications bus. A sleep mode shall be included in the PID functions. This
feature shall allow the motor to be stopped when at minimum speed for a user
defined period, for additional energy savings.
3. Two (2) programmable analog inputs shall accept a current or voltage.
4. Analog inputs shall include a filter to remove any oscillation in the input signal.
The minimum and maximum values (gain and offset) shall be adjustable within
the range of 0 - 20 ma and 0 - 10 Volts. Additionally, the reference must be able
to be scaled so that maximum reference can represent a frequency less than 60
Hz, without lowering the drive maximum frequency below 60 Hz. Process
variables shall be capable of being inverted.
5. Six (6) programmable digital inputs for maximum flexibility in interfacing with
external devices. One digital input is to be utilized as a customer safety
connection point for fire, freeze, and smoke interlocks (Enable). These inputs can
also be used to activate the setpoints of individual control loops.
6. Two (1) programmable analog output proportional to Frequency, Motor Speed,
Output Voltage, Output Current, Motor Torque, Motor Power (kW), DC Bus
voltage, Active Reference, and other data.
7. Three (3) programmable digital relay outputs. The relays shall be rated for
maximum switching current 8 amps at 250 VAC and 0.4 A at 125 VAC. Outputs
shall be full form C relay contacts; open collector outputs are not acceptable.
8. Fifteen (15) programmable preset speeds.
9. Two independently adjustable accel and decel ramps. These ramp times shall be
adjustable from 1 to 3600 seconds.
10. The VFD shall Ramp or Coast to a stop, as selected by the user.
11. The displayed operating information shall be user selectable and include up to
nine parameters which can be viewed and monitored at one time.
12. Up to 20 parameters shall be user selected for storing in a user grouping for ease
of configuration and customization.
13. All applicable operating values shall be displayed in engineering (user) units.