5-37
H Speed Search (Set Value: 14, 15)
· The speed search function is provided for smooth restarting without stopping a free
running motor. Use it when switching the motor from a commercial power supply op-
erationtoInverteroperation,whenstartingwiththeInverteramotorturned byexternal
force, and so on.
· Thespeedsearchfunctionsearchesforthepresentmotorspeed,fromhighfrequency
tolow.Whenthemotor’srotationspeedisdetected,itisacceleratedfromthatfrequen-
cy to the frequency reference according to the acceleration/deceleration time setting.
Forward (reverse) RUN command
Speed search command
0.5 s min.
High-speed frequency
or set frequency (fre-
quency reference)
Minimum base block time (0.5 s)
Speed search operation
n102: Speed search operating level
n101: Deceleration time
ON
ON
Note For5.5-and7.5-kW Invertersonly,thespeedsearch functioncan beadjusted bysetting
parameters n101 (speed search deceleration time) and n102 (speed search operating
level).If the speedsearch cannotbe executed properly using thedefault setting, length-
en the deceleration time or lower the operating level. To reduce the speed search time,
checkwiththe applicationwhileeithershorteningthe decelerationtimeorraisingtheop-
erating level.
n101 Speed Search Deceleration
Time
Register 0165
Hex
Changes during
operation
No
Setting
range
0.0 to 10.0 Unit of
setting
0.1 s Default setting 2.0
n102 Speed Search Operating
Level
Register 0166
Hex
Changes during
operation
No
Setting
range
0 to 200 Unit of
setting
1 % Default setting 150
Basic Operation Chapter 5
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