5-66
îš‹ N: Special Adjustments
The following settings are made with the special adjustments constants (N constants): Hunting prevention,
speed feedback detection control, high-slip braking, and feed forward control.
îš„Hunting Prevention Function: N1
User constants for hunting prevention 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
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
N1-01
Hunting-
prevention
function
selection
0: Hunting-prevention
function disabled
1: Hunting-prevention
function enabled
The hunting-prevention
function suppresses hunt-
ing when the motor is
operating with a light
load.
This function is enabled
in V/f control method
only.
If high response is to be
given priority over vibration
suppression, disable the
hunting-prevention function.
0 or 1 1 No A A No No 580H 6-47
N1-02
Hunting-
prevention
gain
Set the hunting-prevention
gain multiplication factor.
Normally, there is no need to
make this setting.
Make the adjustments as fol-
lows:
• If vibration occurs with
light load, increase the set-
ting.
• If the motor stalls, reduce
the setting.
If the setting is too large, the
voltage will be too sup-
pressed and the motor may
stall.
0.00 to
2.50
1.00 No A A No No 581H
4-18
6-47
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