YASKAWA E-7S SERVOPACK SGD7S - Page 357

8.14 Diagnostic Tools
8.14.2 Easy FFT
8-90
Easy FFT is built into the SERVOPACK for compatibility with previous products. Normally use
autotuning without a host reference for tuning.
Preparations
Always check the following before you execute Easy FFT.
• The parameters must not be write prohibited.
• The main circuit power supply must be ON.
• The test without a motor function must be disabled (Pn00C = n.0).
• There must be no alarms.
• There must be no hard wire base block (HWBB).
• The servo must be OFF.
• There must be no overtravel.
• An external reference must not be input.
Applicable Tools
The following table lists the tools that you can use to perform EasyFFT and the applicable tool
functions.
WARNING
 Never touch the Servomotor or machine during execution of Easy FFT. Doing so may result
in injury.
CAUTION
 Use Easy FFT when the servo gain is low, such as in the initial stage of servo tuning. If you
execute Easy FFT after you increase the gain, the machine may vibrate depending on the
machine characteristics or gain balance.
Tool Function Operating Procedure Reference
Digital Operator Fn206
Σ-7-Series Digital Operator Operating
Manual (Manual No.: SIEP S800001 33)
SigmaWin+ Setup - Easy FFT
Operating Procedure on page 8-91
Frequency
waveform
reference
Response
SERVOPACK
Servomotor
Travel Distance
Travel Distance