5.4 Details of Function Codes
5-185
Details of
Function Codes
F codes
E codes
C codes
P codes
H08 to H09
A codes
b codes
r codes
J codes
d67
U codes
y codes
Chapter 5 Function Code
Auto search operation
During the starting up while the auto search is effective, the auto search is executed without stopping the
idling monitor. Therefore, the speed at the startup is searched (Approx. max. 1.2 s). After completion of
speed search, the speed accelerates to the set frequency according to the acceleration time setting.
Fig. 5.4-82 Auto search operation
Starting characteristics (Auto search wait time 1) (H49)
- Data setting range: 0.0 to 10.0 (s)
Auto search will become unsuccessful if it is done while the motor retains residual voltage.
It is, therefore, necessary to leave the motor for an enough time for residual voltage to disappear.
At the startup triggered by a run command ON, auto search starts with the delay specified by the start
characteristics (auto search wait time 1) (H49). Using H49, therefore, eliminates the need of the run
command timing control when two inverters share a single motor to drive it alternately, allow the motor to
coast to a stop, and restart it under auto search control at each time of inverter switching.
Starting Mode (Auto search wait time 2) (H46)
- Data setting range: 0.1 to 10.0 (s) (ROM version earlier than 2000)
0.1 to 20.0 (s) (ROM version 2000 or later)
At the restart after a momentary power failure, when turning on/off the coast to a stop command BX, and
during execution of retry operation, secure the time necessary in the startup characteristics (auto search wait
time 2) (H46). The inverter will not start unless the time specified by H46 has elapsed, even if the starting
conditions are satisfied. It starts up after the auto search wait time elapses.
Fig. 5.4-83
Under auto search control, the inverter searches the motor speed with the voltage applied at the motor start
and the current flowing in the motor, based on the model built with the motor parameters. Therefore, the
search is greatly influenced by the residual voltage in the motor.
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