Delta VFD-L-I Series, User Manual

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Chapter 4 Parameters
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VFD-L-I Series
Revision July 2009, SW V1.1 4-17
RUN S TO P
RUN S TO P
F requenc y
Time
Time
set ting
frequency
motor
speed
operation
command
decel ti me
F ig ure 2: free ru n to st op
F requenc y
set ting
frequency
motor
speed
operation
command
decel ti me?
F ig ure 1: ram p t o st op
The motor stop method is usually determined by the characteristics of the motor load and
how frequently it is stopped.
(1) It is recommended to use “ramp to stop” for safety of personnel or to prevent
material from being wasted in applications where the motor has to stop after
the drive is stopped. The deceleration time has to be set accordingly. (figure 1)
(2) If motor free running is allowed or the load inertia is large, it is recommended to
select “coast to stop”. For example: blowers, pumps and mixers .(figure 2)
02-03
PWM Carrier Frequency Selections
Unit: 1kHz
Settings 3 to 10 kHz Factory Setting: 10
This parameter determines the PWM carrier frequency of the AC motor drive.
3kHz
5kHz
10kHz
Minimal
Signifi cant
Minimal Minimal
Signifi cant
Signifi cant
Carrier
Frequenc y
Elect romagnet ic
Noise
Nois e, leakage c ur rent Heat dis sipati on
From the table, we see that the PWM carrier frequency has a significant influence on the
electromagnetic noise, AC motor drive heat dissipation, and motor acoustic noise.
02-04 Motor Direction Control
Factory Setting: 1
Settings 0 Enable forward/reverse operation
1 Disable reverse operation
2 Disable forward operation