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îš„Setting Precautions
• When both external search commands 1 and 2 are set for the multi-function digital terminals, an OPE03
alarm will occur.
• If performing speed search using external search commands ensure that the RUN command and the exter-
nal search command remain both ON.
• If the Inverter output is equipped with a contactor, set the contactor operation delay time in the Speed
Search Wait Time (b3-05). The factory setting is 0.2 sec. If no contactor is used the setting can be reduced
to 0 sec.
• Parameter b3-02 (current detection level for search completion) is effective only when current detection
speed search is selected. When the current falls below the detection level, the speed search is supposed to
be completed, and the motor accelerates or decelerates to the set frequency.
• Parameter b3-03 sets the time the output frequency is reduced during speed search until the actual motor
speed is detected.
• If an overcurrent (OC) is detected when using speed search, lengthen the Minimum Baseblock Time (L2-
03).
• If speed search is only desired in the last known operation direction set b3-14 to 1.
îš„Application Precautions for Speed Calculation Speed Search
• Always perform non-rotating autotuning for line-to-line resistance before using speed searches based on
calculated speeds.
• If the cable length between the motor and Inverter is changed after autotuning has been performed, per-
form stationary autotuning for line-to-line resistance again.
îš„Speed Search Selection
The speed search method can be selected using b3-01. If b3-01 is set to 0 the search method is speed calcula-
tion. It has to be activated by a multi-function input (H1- set to 61 or 62).
If b3-01 is set to 1, the search method is speed calculation too, but speed search is performed at every RUN
command and has not to be activated by a multifunction input.
The same is valid for setting b3-01 to 2 or 3, only the search method is current detection and not speed calcu-
lation.
Search Name Speed Calculation Current Detection
Search Method
Calculates the motor speed at speed search
start and accelerates or decelerates from the
calculated speed to the set frequency. The
direction of motor rotation is also detected.
Starts speed search from the last known fre-
quency or the maximum output frequency. The
output frequency is decreased until the output
current falls below the speed search operating
current.
External Speed Search
Command
With external speed search command 1and 2
the speed calculation is performed and the
speed search started from the calculated speed.
External speed search command 1:
Starts speed search from the maximum output
frequency.
External speed search command 2:
Starts speed search from the frequency refer-
ence set before the search command.
Application
Precautions
Cannot be used with multi-motor drives or
with motors two or more sizes smaller than the
Inverter capacity.
The motor may accelerate suddenly with light
loads.
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