Table of Contents
Advertisement
22.
METERS
-
Pr.27
S.ningth.rclllpnv.miontunctlonopMUon
bwf
lPrpl
sw
m e n t i o n f ~ n c b ~ n
q
w
a
h lev4
( a r r e n t
Hrnh operatio0 level)
SWI prevenhon I u M operation
l e v e l
Onset coemdent for
dwble-sped operat& ( c u r r e n t
limit level reductlcn rate offset metfidsni at 400
H z )
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
I f
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
h M
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 .
- 6 9 -
Advertisement
Table of Contents
