PowerFlex Digital DC Drive User Manual - Publication 20P-UM001C-EN-P - July 2008
Programming and Parameters 3-37
APPLICATIONS
PID Control
757 [PID Clamp]
The PID “clamp” allows a smooth tension setting of a controlled
system winder/unwinder when the calculation of the initial diameter
function cannot be used.
• When enabling the drive, the dancer is at the lowest point of its full
scale. In this case, with Par 759 [PID Error] at its maximum value,
the motor could accelerate too fast to properly configure the dancer
for its central operating position. By setting the value of Par 757
[PID Clamp] sufficiently low. e.g, = 1000, when the drive starts and
Par 770 [Enable PD] = 1 “Enable”, the value of Par 759 [PID Error]
is limited to 1000 until the signal coming from the dancer (via Par
763 [PID Feedback]) goes above the value in this field. Then, the
value of [PID Clamp] is automatically returned to its maximum
value of 10000. The PID clamp is kept at 10000 until the drive
stops or Par 770 [Enable PD] = 0 “Disabled”.
Default:
Min/Max:
10000
0 / 10000
759,
763,
770
758 [Feed Fwd PID]
Feedback from the transducer position (dancer) or tension.
Default:
Min/Max:
Read Only
–/+10000
759 [PID Error]
Error value input to the PID function (output of the PID Clamp block).
Default:
Min/Max:
Read Only
–/+10000
760 [PID Setpoint 0]
First offset value added to Par 763 [PID Feedback]. This parameter
can be assigned to an analog input, e.g., for the tension setting when
a load cell must be used as feedback.
Default:
Min/Max:
0
–/+10000
763
761 [PID Setpoint 1]
Second offset value added to Par 763 [PID Feedback].
Default:
Min/Max:
0
–/+10000
763
762 [PID Setpoint Sel]
Selects the offset value added to Par 763 [PID Feedback]. This
parameter can be assigned to a digital input.
Default:
Options:
0 =
0 =
1 =
“Setpoint 0”
“Setpoint 0”
“Setpoint 1”
763
763 [PID Feedback]
Analog input feedback value received from the transducer position
(dancer) or tension (load cell).
Default:
Min/Max:
0
–/+10000
772 [PID Output Sign]
Determines whether the output of the PID regulator is bipolar or
positive (clamp of the negative side).
Default:
Options:
1 =
0 =
1 =
“Bipolar”
“Positive”
“Bipolar”
773 [PID Output Scale]
Scale factor for Par 774 [PID Output]. The value of this parameter
depends on to which parameter you want to send the PID regulator
output.
Default:
Min/Max:
1.00
–/+100.00
774
774 [PID Output]
Displays the PID regulator output.
Note: This parameter can be assigned to an analog output in order to
provide a cascaded reference in multi-drive systems.
Default:
Min/Max:
Read Only
–/+10000
File
Group
No.
Parameter Name & Description
See page 3-2 for symbol descriptions
Values
Related
A
A
A
A
A
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