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3.7.6
Speed compensation (Pr. 706, Pr. 798)
Perform speed compensation for the result of PID calculation.
Parameter
Number
706
Speed compensation gain
798
Speed compensation bias
• Turn X35 signal ON to perform compensation by main rotation speed command.
For the X35 signal, set "35" in any of Pr. 178 to Pr. 189 (input terminal function selection) to assign the function.
Pr. 178 to Pr. 189
Signal
setting
35
X35
(1) When Pr. 706 = 0% is set (initial value):
Regardless of ON/OFF of X35 signal, speed compensation gain = 100%. The Pr. 798 setting also becomes disabled.
Speed command value = PID calculation result [%]
(2) When other than Pr. 706 = 0%:
When X35 is ON:
PID manipulated variable is 0% at main speed 0%.
Speed command value = PID calculation result [%]
When X35 is OFF:
Speed command value = PID calculation result [%]
When X35 is ON (fixed compensation rate)
(when X35 is not assigned)
PID manipulated amount
Pr. 903
Gain f
Pr. 902
Bias f
0%
Determine the manipulated amount by multiplying
the PID calculation result by the following ratio.
PID
Pr. 706/100
speed command [%]/100
The manipulated amount changes with the main speed.
For the calculation, use a value reversely converted into
a percentage by Pr. 902 and Pr. 903.
(Note) When Pr. 73 setting is polarity reversible, manipulated amount is also output to the reverse rotation.
Name
Setting Range
0 to 200%
0 to 200%
Function
Speed
OFF: Speed compensation gain is independent of main speed and does not change with it.
compensation
ON: Speed compensation gain changes with main speed.
gain
Speed compensation gain changes with main speed when X35 signal is not assigned.
selection
= PID calculation result + main speed
= PID calculation result [%]
Pr.706
(Speed compensation
gain)
Pr.798
(Speed compensation
bias)
= PID calculation result [%]
Main speed setting
100%
Main speed setting
(winding diameter compensated)
Initial
Increments
Value
0.1%
0%
0.1%
60%
Description
speed compensation gain [%] + main speed
speed compensation gain [%] + main speed
{ (Pr. 706 [%] - Pr. 798 [%])
main speed [%] + Pr. 798 [%]} + main speed
Main speed
(winding diameter compensated)[%]
speed compensation gain [%] + main speed
Pr. 706 [%] + main speed
When X35 is OFF (fixed compensation value)
(Pr. 706
0)
PID manipulated amount
Pr. 903
Gain f
Pr. 902
Bias f
0%
Determine the manipulated amount by multiplying
the PID calculation result by the following ratio.
PID
Pr. 706/100
The manipulated amount does not change with the main speed.
Dancer control detail
Remarks
When setting is 0%, Pr. 798 and
X35 are inactive.
Main speed setting
100%
Main speed setting
(winding diameter compensated)
3
31
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