Delta Electronics AC Motor Drive VFD-G - Manual (Page 84)

Chapter 4 Parameters|
Revision July 2008, EG03, SW V1.06 4-33
Coast: The AC drive output instantly stops upon command and the motor free spins until it
comes to a complete stop.
External Fault may be enabled by the EF terminal or a Multi-Function terminal. Please refer to
Pr.04-00 to 04-03.
Motor
speed
Operation
Command
RUN
STOP
Stops according
to deceleration
time
Motor
Speed
Operation
Command RUN STOP
Free running
to stop
Frequency
Output
Frequency
Time
Frequency
Output
Frequency
Time
Ramp Coast
02 - 03 PWM Carrier Frequency Selections
Settings 7.5~10HP: 4000~6000Hz Factory Setting: 6000
15~30HP: 3000~6000Hz Factory Setting: 6000
40~125HP: 2000~6000Hz Factory Setting: 4000
150~300HP: 2000~4000Hz Factory Setting: 4000
This parameter sets the carrier frequency of PWM output. The factory setting and setting
range depend on the model type.
When the temperature of the heat sink is greater than its limit, the AC drive will automatic
lower the carrier frequency to avoid over heating the AC drive.
The Carrier frequency of the PWM output has a signification influence on the electromagnetic
noise, heat dissipation of the AC drive, and the acoustic noise to the motor as shown in the
following chart.
Carrier
Frequency
Acoustic
Noise
Electromagnetic
Noise
Leakage
Current
Heat
Dissipation
Signification
Minimal
Minimal
Signification
Signification
Minimal
Signification
Minimal
Signification
Minimal
When the carrier frequency is low, current ripple of the AC drive is large. This may result in a
current display value greater than the actual value.