5-35
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 operation to Inverter operation,
when starting with the Inverter a motor turned by external force, and so on.
• The speed search function searches for the present motor frequency, from high frequency to low.
When the motor’s rotation speed is detected, it is accelerated from that frequency 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 (frequency
reference)
Minimum base block time (0.5 s)
Speed search operation
n102: Speed search operating level
n101: Deceleration time
ON
ON
Note For 5.5- and 7.5-kW Inverters only, the speed search function can be adjusted by setting parame-
ters n101 (speed search deceleration time) and n102 (speed search operating level). If the speed
search cannot be executed properly using the default setting, lengthen the deceleration time or
lower the operating level. To reduce the speed search time, check with the application while either
shortening the deceleration time or raising the operating 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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