4-154
The speed search cannot be used when the motor rated power is greater than the inverter
rated power.
In V / F mode, it is necessary to perform a static auto-tune.
In SLV mode, it is necessary to perform a rotational auto-tune. Perform a static auto-tune when
using long motor leads.
Speed Direction Search Operating Current (07-19)
(1) Used in bidirectional speed search only (07-24 = 1).
(2) Set bidirectional current level.
(3) Increase value if speed search is not successful at low speeds (above 5Hz)
Note：
If value is too high may cause DC braking effect.
Speed Search Operating Current (07-20)
(1) Can be used for bidirectional (07-24 = 1) or unidirectional (07-24 = 0) speed search.
(2) Sets speed search current Level.
(3) The set value must be lower than the excitation current (02-09) and must equal to the no-load
current. If the no-load current is unknown it is recommended to set value at 20%.
(4) Excessive speed search current will cause inverter output to saturate.
(5) It is recommended to use speed search in case of a momentary power loss. Increase the
minimum base block time (07-18) in case of an over-current condition.
Integral time of speed searching (07-21)
(1) Can be used for bidirectional (07-24 = 1) or unidirectional (07-24 = 0) speed search.
(2) Set the integral time during speed search.
(3) If OV occurs, increase the set value to increase the speed search time. Decrease the value if a
quick start is required.
Delay time of speed searching (07-22)
(1) Use delay time (07-22) when using a contactor on the inverter output side.
(2) Speed search delay time is disabled when set to 0.0 sec. (07-22 = 0.0)
Voltage recovery time (07-23).
(1) Sets the voltage recovery time.
(2) Sets the time for the inverter to restore the output voltage from 0V to the specified V/f level
after speed search function is completed.
Direction-Detection Speed Search (07-24)：
(1) 07-24=1, enable direction-detection speed search：
At start the current controller will send a step current to the motor (07-19) to determine the
motor direction. Once direction is determined the current controller will perform a speed
search using speed search operating current defined in parameter 07-20. Speed search is
executed after a momentary power loss (external speed search command 2, 03-00 to
03-05=34) or from max. frequency (external speed search command 1, 03-00 to 03-05=19).
Speed search direction will follow the speed command.
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