Speed Search Function - Panasonic VF200 Instruction Manual

Appendix Function Parameter List

■ Speed Search Function

・The inverter will apply minor DC voltage to the motor, detect its rotation
speed and restart it at this frequency when the motor rotates freely due to
inertia, which is the so-called "speed search fuction".
・There are 3 methods to start speed search.
1) Through input signal from control terminals (SW1 to SW5)
Related parameters: P036 to P040 (SW1 to SW5 Function Select)
2) During motor startup
Related parameter: P162 (Speed Search Select during Startup)
3) During retry operation of inverter after fault trip occurence
Related parameters: P022 (Retry Function), P165 (Speed Search Select
during Retry)
・Perform speed search according to the following procedures.
・Conditions of speed search can be set with parameter P163 to P168.
・To start speed search with control input is only valid during free
operation.Therefore, even if the control input assigned to speed search is ON,
the speed search will nevertheless be ignored.
・If the rotation speed is too low and the rotation direction does not match the
rotation command, the rotation speed may not be sensed.
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