65
CHAPTER 9 – Parameter setting by Profibus
SMT-BD1/t
Proportional gain of the PID loop
PNU :
831
Defines the proportional gain of the PID loop for a tension or speed 2 control sequence.
Parameter
1
word.
Conversion
1/512
Limitation
0 to 65535
Integral gain of the PID loop
PNU :
832
Defines the integral gain of the PID loop for a tension or speed 2 control sequence.
Parameter
1
word.
Conversion
1/65535
Limitation
0 to 65535
Derivative gain of the PID loop
PNU :
833
Defines the derivative gain of the PID loop for a tension or speed 2 control sequence.
Parameter
1
word.
Conversion
1/32
Limitation
0 to 65535
Speed variation limit
PNU :
834
Defines the maximum value of the motor speed reference given by the PID regulator.
Parameter
1
word.
Limitation
This parameter varies between 0 rpm and the
maximum motor speed
value in rpm.
Note
This parameter refers to the motor speed value at the minimum diameter. The actual speed
variation limit on the motor is obtained by multiplying this value by the current gearing ratio gain.
Remark
When the TDI input (X2 connector pin 22) is activated during a tension control sequence, the
PID regulator output is set at 0.
2.9 - Gearing ratio calibration parameters
Diameter low-pass filter
PNU :
840
Defines the time constant of the first order filter that acts upon the diameter measurement signal or the encoder
ratio measurement signal.
Parameter
1
word.
Unit
ms
Variation
1 to 10000
Diameter sensor value for min. diameter
PNU :
841
Defines the voltage value provided by the diameter sensor when the spool is empty (minimum diameter).
Parameter
1
word.
Unit
Volts
Conversion
1/3276,7
Variation
0 to 32767
Diameter sensor value for max. diameter
PNU :
842
Defines the voltage value provided by the diameter sensor when the spool is full (maximum diameter).
Parameter
1
word.
Unit
Volts
Conversion
1/3276,7
Variation
0 to 32767
Diameter sensor value
PNU :
843
Reads the voltage value provided by the diameter sensor. The former parameters can be easily initialised
according to the following method:
In a first time, an empty spool corresponding to the minimum diameter is put on the machine and the voltage
value read is entered in the
Diameter sensor value for min diameter
parameter.
Then, the same operation is executed with a full spool in order to initialise the
Diameter sensor value for max
diameter
parameter.
Parameter
1
word.
Unit
Volts
Conversion
1/3276,7
Variation
0 to 32767