28
Dancer control detail
(4) Dancer roll malposition detection (signal loss detection)
This function prevents motor speed to increase by the dancer control when dancer roll falls by signal loss.
• If dancer roll stays at the upper limit or the lower limit for more than
Pr. 711 Signal loss detection stationary time
, it is
recognized as dancer roll malposition (signal loss), and compensation by PID control becomes 0.
When below two conditions are both met, dancer control (PID calculation) is resumed.
1. Motor is stopped or output is shutoff.
2. Start signal is OFF.
• Y50 signal can be output for dancer roll malposition detection (signal loss detection).
Set "50 (positive logic) or 150 (negative logic)" in any of
Pr. 190 to Pr. 196 (Output terminal function selection)
to assign Y50
signal to an output terminal.
Parameter
Number
Name
Setting Range
Increments
Initial
Value
Remarks
131
PID upper limit
400 to 600%, 9999
0.1%
9999
400%
-100%
500%
0%
600%
100%
132
PID lower limit
400 to 600%, 9999
0.1%
9999
711
Signal loss detection
stationary time
0 to 100s, 9999
0.01s
9999
9999:No signal loss
detection
Pr. 190 to Pr. 196
Setting
Signal
Function
Functions
Positive
logic
Negative
logic
50
150
Y50
Dancer roll
signal loss
detection
Output when dancer roll malposition is detected.
When below two conditions are met, Y50 signal is canceled.
1. Motor is stopped or output is shutoff.
2. Start signal is OFF.
Winding diameter
compensation amount
Signal loss detection
Start command
ON
OFF
Lower limit of dancer roll (
Pr. 132
)
OFF
OFF
ON
Y50
Pr. 711
(Signal loss detection stationary time)
PID manipulated
amount = 0
Normal operation
Dancer roll center position
Turns OFF when motor
is stopped and start
signal is OFF.
Output speed at signal loss
Main speed command
Dancer roll falls
to the lower limit.
