Learning Advanced Features
Speed Search Operation Setting Details
Select a speed search type.
The speed search is carried out as it controls the inverter
output current below the Cn.72 (SS Sup-Current) setting.
Use when the direction of the idling motor and the
direction of the start command are the same. A stable
speed search function can be performed at about 10 Hz
or lower.
However, if the direction of the idling motor and the
direction of the start command are different, the speed
search does not produce a satisfactory results. The
direction of the idling motor cannot be established.
The speed search is carried out as it PI controls the ripple
current which is generated by the counter electromotive
force during no-load rotation. The counter electromotive
force is proportional to the idle speed. This mode
establishes the direction of the idling motor
(forward/reverse), and the speed search function is stable
regardless of the direction of the idling motor and
direction of the start command. However because the
ripple current is used, the frequency is not determined
accurately at low speeds (about 10–15 Hz). Re-
acceleration may start from zero speed.
When the top LED segment is on, the corresponding bit is set to 1 (enabled). When
the bottom LED segment is on, the corresponding bit is 0 (disabled).
Speed search can be selected to operate among the following 4
conditions.
Type and Functions of Speed Search Setting
Speed search for general
acceleration
Initialization after a fault
Restart after instantaneous power
interruption
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