Ghisalba VFD-E Series - Page 82

Chapter 5 Parameters
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VFD-E Series
Revision August 2006, 01EE, SW--PW V1.03/CTL V2.03 5-37
 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.
 The PWM carrier frequency may derate the rated current. The higher carrier frequency will
decrease rated current to prevent AC motor drive overheat and extend IGBT’s life. Therefore,
it is necessary to have this kind of protection method. The rated current for the AC motor drive
with carrier frequency (8kHz and below) is 100%. The curve between the rated current and
carrier frequency (at 50
o
C) is shown as follows.
40%
50%
60%
For 460V Series at 50 (122 )
ദബ
80%
90%
100%
70%
Carrier
Frequency
R
a
t
e
d
C
u
r
r
e
n
t
(
%
)
40%
50%
60%
For 115V/230V Series at 50 (122 )
ദബ
80%
90%
100%
2kHz
4kHz 8kHz
10kHz
12kHz
14kHz
16kHz
6kHz
70%
R
a
t
e
d
C
u
r
r
e
n
t
(
%
)
2kHz
4kHz 8kHz
10kHz
12kHz
14kHz
16kHz
6kHz
Carrier
Frequency
02.04 Motor Direction Control
Factory Setting: 0
Settings 0 Forward/Reverse operation enabled
1 Reverse operation disabled
2 Forward operation disabled
 This parameter is used to disable one direction of rotation of the AC motor drive direction of
rotation. See Chapter 2 for definition of direction of rotation.
02.05 Line Start Lockout
Factory Setting: 1
Settings 0 Disable. Operation status is not changed even if operation
command source Pr.02.01 is changed.
1 Enable. Operation status is not changed even if operation command
source Pr.02.01 is changed.
2 Disable. Operation status will change if operation command source
Pr.02.01 is changed.
3 Enable. Operation status will change if operation command source
Pr.02.01 is changed.
 This parameter determines the response of the drive upon power on and operation command
source is changed.