Omron SYSDRIVE 3G3MV User Manual page 136

Basic Operation
Speed Search (Set Value: 14, 15)
H
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-
eration 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 speed, from high frequency
·
to low. When the motor's rotation speed is detected, it is accelerated from that frequen-
cy to the frequency reference according to the acceleration/deceleration time setting.
Forward (reverse) RUN command
Speed search command
High-speed frequency
or set frequency (fre-
quency reference)
Minimum base block time (0.5 s)
For 5.5- and 7.5-kW Inverters only, the speed search function can be adjusted by setting
Note
parameters n101 (speed search deceleration time) and n102 (speed search operating
level). If the speed search cannot be executed properly using the default setting, length-
en 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 op-
erating level.
Speed Search Deceleration
n101
Time
Setting 0.0 to 10.0
range
Speed Search Operating
n102
Level
Setting 0 to 200
range
ON
0.5 s min.
n101: Deceleration time
Speed search operation
Register 0165
Hex
Unit of 0.1 s
setting
Register 0166
Hex
Unit of 1 %
setting
Chapter 5
ON
n102: Speed search operating level
Changes during
operation
Default setting
Changes during
operation
Default setting
No
2.0
No
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