134
Function assignment of external
(3) Speed detection hysteresis
(Pr. 870)
⋅
This function prevents chattering of the speed detection
signals.
When an output frequency fluctuates, the up to frequency
signal (SU) and output frequency detection signals (FU,
FU2) may repeat ON/OFF (chatters). Setting hysteresis
to the detected frequency prevents chattering of these
signals.
REMARKS
The output frequency compared with the set frequency changes depending on the control method.
CAUTION
⋅
Changing the terminal assignment using
Pr. 190 to Pr. 196 (output terminal function selection)
may affect the other functions.
Please set parameters after confirming the function of each terminal.
♦
Parameters referred to
♦
Pr. 190 to Pr. 196 (output terminal function selection)
Pr.870
Pr.42
Output frequency
(Hz)
ON
ON
ON
FU
Example of output frequency detection signal (FU)
OFF
OFF
REMARKS
Setting a higher value to this parameter slows the response of
frequency detection signals (SU, FU and FU2).
Control Method
Compared Output Frequency
V/F control
Output frequency
Simple magnetic flux vector control
Output frequency before slip compensation
Содержание 700 Series
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