Programming Your Application 6-39
590 Series DC Digital Converter
PID
This is a general purpose PID block which
can be used for many different closed loop
control applications. The PID feedback can
be loadcell tension, dancer position or any
other transducer feedback such as pressure,
flow etc.
Features:
• Independent adjustment of gain and
time constants.
• Additional first-order filter (F).
• Functions P, PI, PD, PID with/without
F individually selected.
• Ratio and divider for scaling each
input.
• Independent positive and negative
limits.
• Output scaler (Trim).
• Gain profiled by diameter for centre-
driven winder control.
PID
–
PID OUTPUT [417]
–
0.00%
–
PID CLAMPED [416]
–
FALSE
–
PID ERROR [415]
–
0.00%
1.0
–
[404] PROP. GAIN
–
5.00s
–
[402] INT. TIME CONST.
–
0.000s
–
[401] DERIVATIVE TC
–
100.00%
–
[405] POSITIVE LIMIT
–
-100.00%
–
[406] NEGATIVE LIMIT
–
0.2000
–
[407] O/P SCALER (TRIM)
–
0.00%
–
[410] INPUT 1
–
0.00%
–
[411] INPUT 2
–
1.0000
–
[412] RATIO 1
–
1.0000
–
[413] RATIO 2
–
1.0000
–
[418] DIVIDER 1
–
1.0000
–
[414] DIVIDER 2
–
ENABLED
–
[408] ENABLE
–
OFF
–
[409] INT. DEFEAT
–
0.100s
–
[403] FILTER T.C.
–
0
–
[473] MODE
–
20.00%
–
[474] MIN PROFILE GAIN
–
–
PROFILED GAIN [475]
–
0.0
MMI Menu Map
1
SETUP PARAMETERS
2
SPECIAL BLOCKS
3
PID
PROP. GAIN
INT. TIME CONST.
DERIVATIVE TC
POSITIVE LIMIT
NEGATIVE LIMIT
O/P SCALER (TRIM)
INPUT 1
INPUT 2
RATIO 1
RATIO 2
DIVIDER 1
DIVIDER 2
ENABLE
INT. DEFEAT
FILTER T.C.
MODE
MIN PROFILE GAIN
PROFILED GAIN
Parameter Descriptions
PROP. GAIN
Range: 0.0 to 100.0
This is a pure gain factor which shifts up or down the whole Bode PID transfer function leaving
the time constants unaffected. A value of P = 10.0 means that, for an error of 5%, the
proportional part (initial step) of the PID output will be:
10 x [ 1 + (Td/Ti) ] x 5 % , i.e. approx. 50% for Td << Ti.
INT. TIME CONST.
Range: 1.000s to 10.000s
The integrator time constant (Ti)
DERIVATIVE TC
Range: 0.000s to 10.000s
The differentiator time constant (Td). When Td = 0 the transfer function of the block becomes a
P+I.
POSITIVE LIMIT
Range: 0.00% to 105.00%
The upper limit of the PID algorithm.
NEGATIVE LIMIT
Range: -105.00% to 0.00%
The lower limit of the PID algorithm.
O/P SCALER (TRIM)
Range: -3.0000 to 3.0000
The ratio which the limited PID output is multiplied by in order to give the final PID Output.
Normally this ratio would be between 0 and 1.
INPUT 1
Range: -300.00% to 300.00%
This can be either a position/tension feedback or a reference/offset.
INPUT 2
Range: -300.00% to 300.00%
This can be either a position/tension feedback or a reference/offset
RATIO 1
Range: -3.0000 to 3.0000
This multiplies Input 1 by a factor (Ratio 1).
RATIO 2
Range: -3.0000 to 3.0000
This multiplies Input 2 by a factor (Ratio 2).
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