Mitsubishi Electric A800 Plus Series Function Manual page 76

PID upper/lower limit hysteresis width (Pr.137)
When the dancer roll position fluctuates, the FUP/FDN signal may chatter (turn ON and OFF repeatedly), depending on the
position.
To prevent the signal chattering, configure Pr.137 PID upper/lower limit hysteresis width to set a hysteresis for the FUP
and FDN signals.
NOTE
• Pr.137 setting does not affect the operation of the Y231 signal. (Refer to
• When a value other than "9999" is set in Pr.137, depending on fluctuation of the dancer roll position, the FUP/FDN signal may
not be turned ON even if the dancer roll position exceeds the Pr.131 setting or falls below the Pr.132 setting.
Dancer roll position
Pr.131
FUP
ON
Example of the PID upper limit (FUP) signal
Dancer feedback speed control details
Pr.137
ON
ON
page 74 for the details of the Y231 signal.)
DANCER FEEDBACK SPEED CONTROL
3
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