Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 151)

Rockwell Automation Publication 20P-UM001I-EN-P - February 2013 151
Programming and Parameters Chapter 3
APPL
IC
AT
IONS
PI Con
trol
779 [PI Central v sel]
Selects one of the four possible initial output values of the PID regulator integral
component (corresponding to the initial diameter) of the PI block.
• “0” = When the PI block is disabled (Par 769 [Enable PI] = “Disabled”), the last
value of the integral component calculated (corresponding to roll diameter) is
stored in Par 771 [PI Output]. This value is used by the PID regulator when the PI
block is enabled again and the drive is restarted. This function is useful when
for any reason the drive must be turned off or if incoming power is removed
from the drive.
• “1”, “2”, or “3” = When the PI block is disabled (Par 769 [Enable PI] =
“Disabled”), the value of [PI Output] will be set to the value of the selected
parameter (“1” = 776 [PI Central v1], “2” = 777, [PI Central v2], or “3” = 778
[PI Central v3] x1000). This value is only used by the PID regulator when the
drive is powered up and Par 769 [Enable PI] is already enabled.
Note: Par 779 [PI Central v sel] can be set directly from the HIM or through two
digital inputs set respectively as “PI central vs0” and “PI central vs1”. See Pars 780
[PI Central vs0] and 781 [PI Central vs1] for more information on this configuration.
Default:
Min/Max:
1
0 / 3
16-bit
Int 769,
776,
777,
778,
780,
781
780 [PI Central vs0]
When assigned to a digital input and used in combination with Par 781 [PI Central
vs1], through binary selection, determines which of the four possible output
values is used as the initial level of the integral component (corresponding to the
initial diameter) of the PI block.
Default:
Min/Max:
0
0 / 1
16-bit
Int
781 [PI Central vs1]
The output selector of the initial PI block. With the value of Par 780 [PI Central vs0]
determined, through binary selection, what between the four possible settings of
the integral initial level (correspondent to initial diameter) can be used. See Par
780 [PI Central vs0] for binary selections.
Default:
Min/Max:
0
0 / 1
16-bit
Int
783 [PI integr freeze]
Locks the selections made for the integral component of the PID regulator.
Default:
Options:
0 =
0 =
1 =
“Off”
“Off”
“On”
16-bit
Int
784 [PI Upper Limit]
Defines the upper limit of the adapting block for correction of the PI block.
Default:
Min/Max:
10.00
Par 785 [PI Lower Limit] / 10.00
Real
785 [PI Lower Limit]
Defines the lower limit of the adapting block for correction of the PI block.
Default:
Min/Max:
0.00
–10.00 / Par 784 [PI Upper Limit]
Real
793 [PI Init Prop Gn]
The initial value of the proportional gain. This parameter is active when,
• its value has exceeded the value of Par 695 [PI Steady Thrsh],
• the amount of time defined in Par 731 [PID Steady Delay] has elapsed, and
feed–forward is less than the value defined in Par 695 [PI Steady Thrsh], or
• Par 769 [Enable PI] transitions from “0” (low) to “1” (high) and the amount of
time defined in Par 731 [PID Steady Delay] has elapsed.
Default:
Min/Max:
10.00
0.00 / 100.00
Real 695,
731,
769
PD
Co
nt
ro
l
421 [PD Output PID]
Proportional / Derivative (PD) block output.
Default:
Min/Max:
Read Only
–/+10000
16-bit
Int
766 [PD Deriv Gain 1]
First derivative gain of the PD block. The value specified in this field depends on the
enabling and configuration of Par 181 [Adaptive Spd En].
Default:
Min/Max:
1.00
0.00 / 100.00
Real 181
767 [PD Deriv Filter]
Time constant of the filter from the derivative portion of the PD block.
Default:
Min/Max:
Units:
0
1 / 1000
ms
16-bit
Int
Fil
e
Gr
oup
No
. Parameter Name & Description
See page 110 for symbol descriptions
Values Da
ta
T
yp
e
Rela
ted
A
A
Par 780 Par 781 Selects the value in . . .
0 0 Par 771 [PI Output]
0 1 Par 776 [PI Central v1]
1 0 Par 777 [PI Central v2]
1 1 Par 778 [PI Central v3]
A
A
A
A
A
A
A
A