22. PARAMETERS Pr.22
-
Pr.27
S.ningth.rclllpnv.miontunctlonopMUon
bwf
lPrpl
sw
mention
f~ncb~n
qwah
lev4
(arrent
Hrnh
operatio0
level)
SWI
prevenhon
IuM
operation
level
Onset
coemdent
for
dwble-sped
operat&
(current
limit
level reductlcn rate offset
metfidsni
at
400
Hz)
IPr66]
Frequency
for
sal1
prevention
function
level reduction
start
frequency
Set the stall prevention functlon operation level
(current limit level) for Pr.22. Usually, the setting
should
be
150%
(factory-setting).
If
the motor is controlled to run at a speed faster
than 60
Hz,
there are cases when the mdor can-
not
be
accelerated because motor current does
not increase. For such cases,
it
is possible
to
If
reduce the current limit level in the high frequen-
cy range to improve the motor operation charac-
teristis. Usually, initial setting is Pr.66
=
60
Hz,
Pr.23
=
100%.
0
If
‘9999” (factorysetting)
is
set for Pr.23, the cur-
rent limit level which is set for Pr.22 is applied
to
the range up
to
400
Hz.
apr
hM
Setting
example:
Pr. 22
=
150%,
Pr.23
=
100%.
Pr.66
=
60
Hz
Note:
The setting value of
Pr. 22 can not be
changed during opera-
tion even
il
Pr.
77
is
set to 2 (writing during
operation enabled).
Calculating the current limit function operation level
-..
CalCUlating the current limit function operation level
=
A
+
B
x
where,
A=
output frequency
(HZ)
=
~-
Pr.66
(Hz)
x
Pr.22(%) Pr.66
(Hz)
x
Pr.22(%)
400
(Hz)
I
d
CAUTION
I
Do
not set the stall preventlon operation level
too
small.
If set
so,
torque generated will reduce.
=
Refer
to
~r.4.
-69-
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