Hunting-Prevention Function - YASKAWA Varispeed G7 Instruction Manual

Normally, there is no need to make this setting. Adjust the constant as shown below.
If the motor is vibrating, increase the set value.
•
If the motor response is low, decrease the set value.
•

Hunting-prevention Function

The hunting-prevention function suppresses hunting when the motor is operating with a light load. This func-
tion can be used in V/f and V/f with PG.
Related Constants
Con-
stant
Number
N1-01
N1-02
N1-03
*1
* 1. Applicable for G7-Series Inverters with software version PRG: 1034 and later.
* 2. The factory setting depends upon the Inverter capacity. The value for a 200 V Class Inverter of 0.4 kW is given.
-40
6
Name
Description
Display
Hunting-pre- 0: Hunting-prevention function
vention func- disabled
tion selection 1: Hunting-prevention function
enabled
The hunting-prevention function
suppresses hunting when the
motor is operating with a light
load.
Hunt Prev
This function is enabled in V/f
Select
control method only.
If high response is to be given pri-
ority over vibration suppression,
disable the hunting-prevention
function.
Hunting-pre- Set the hunting-prevention gain
vention gain multiplication factor.
Normally, there is no need to
make this setting.
Make the adjustments as follows:
• If vibration occurs with light
load, increase the setting.
Hunt Prev Gain
• If the motor stalls, reduce the
setting.
If the setting is too large, the volt-
age will be too suppressed and the
motor may stall.
Hunting-pre-
vention time
Set the hunting-prevention pri-
constant
mary delay time in units of ms.
Hunt Prev Time
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0 or 1 1 No A A
0.00 to
1.00 No A A
2.50
10
0 to
No A A
*2
500
ms
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
No No No 580H
No No No 581H
No No No 582H