5-70
îš„Speed Feedback Protection Control Functions: N2
User constants for speed feedback protection control functions are shown in the following table.
îš„High-slip Braking: N3
User constants for high-slip braking are shown in the following table.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO-
BUS
Regis-
ter
Page
Display
V/f
V/f
with
PG
Open
Loop
Vec-
tor
1
Flux
Vec-
tor
Open
Loop
Vec-
tor
2
N2-01
Speed feed-
back detec-
tion control
(AFR) gain
Set the internal speed feed-
back detection control gain
using the multiplication func-
tion.
Normally, there is no need to
make this setting.
Adjust this constant as fol-
lows:
• If hunting occurs, increase
the set value.
• If response is low, decrease
the set value.
Adjust the setting by 0.05 at a
time, while checking the
response.
0.00 to
10.00
1.00 No No No A No No 584H
4-18
6-41
AFR Gain
N2-02
Speed feed-
back detec-
tion control
(AFR) time
constant
Set the time constant to
decide the rate of change in
the speed feedback detection
control.
0 to
2000
50 ms No No No A No No 585H 6-41
AFR Time
N2-03
Speed feed-
back detec-
tion control
(AFR) time
constant 2
Increase the setting if over-
voltage (OV) failures occur at
the completion of accelera-
tion or when the load changes
radically.
0 to
2000
750 ms No No No A No No 586H 6-41
AFR Time 2
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO-
BUS
Regis-
ter
Page
Display
V/f
V/f
with
PG
Open
Loop
Vec-
tor
1
Flux
Vec-
tor
Open
Loop
Vec-
tor
2
N3-01
High-slip
braking
deceleration
frequency
width
Sets the frequency width for
deceleration during high-slip
braking as a percent, taking
the Maximum Frequency
(E1-04) as 100%.
1 to 20 5% No A A No No No 588H -
HSB Down
Freq
N3-02
High-slip
braking cur-
rent limit
Sets the current limit for
deceleration during high-slip
braking as a percent, taking
the motor rated current as
100%. The resulting limit
must be 150% of the Inverter
rated current or less.
100 to
200
150% No A A No No No 589H -
HSB Current
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