— 129 —
6F3A4768
5.4.3.2 IQ Limit
The IQ limit has a flat characteristic as a standard, but as shown in Fig. 5.4.7, it can also be set according to the
speed and operating conditions.
(1) Standard setting
The IQ limit has the following settings and flat characteristic.
The graph in the figure shows this characteristic.
$LMT_IQ_BAS:
Set 2000 (200%), etc. according to OL specification.
$LMT_IQ_TOP:
Set the same value as the value above.
$LMT_IQ_INV:
Set the same value as the value above.
$LMT_SP_BASE:
Set 1000 (100%).
(2) Speed rate
At a speed set by $LMT_SP_BASE or lower, the IQ limit is $LMT_IQ_BAS and it is a value on a straight line
between point ($LMT_SP_BASE, $LMT_IQ_BAS) and point (100% speed, $LMT_IQ_TOP) at higher
speed.
It is also possible to set the IQ limit during regenerative operation.
$LMT_IQ_BAS:
Set the IQ limit at a speed specified by $LMT_SP_BASE or lower.
$LMT_IQ_TOP:
Set the IQ limit at 100% speed.
$LMT_IQ_INV:
Set the IQ limit during regenerative operation.
$LMT_SP_BASE:
Set 1000 (100%).
IQ limit
IQMAX4
Speed
IQ limit
Forward rotation
acceleration
Forward rotation
deceleration
Reverse rotation
deceleration
Reverse rotation
acceleration
Magnetic
flux reference
FL_R
IQ limit calculation
$LMT_IQ_BAS
$LMT_IQ_TOP
$LMT_IQ_INV
$LMT_SP_BASE
Speed feedback
$LMT_IQ_TOP
$LMT_IQ_INV
$LMT_SP_BASE
$LMT_IQ_BAS
100%
$LMT_TRQ
X
Section
5.4.3
Torque
limit
Section
5.4.4
IQ limit
ID limit calculation
$LMT_I1
Section
5.4.4
ID limit
Fig. 5.4.7 IQ Limit
StockCheck.com