Nidec COMMANDER S100, Руководство пользователя

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Commander S100 User Guide
85
Inverting PID signals
When setting up a system, it is important to consider how the system should respond to an increasing feedback signal compared to a decreasing
feedback signal. If the frequency reference should increase when the feedback decreases, then the feedback should be inverted. This can be done
using the input terminal’s (T2 analog input 1, T4 analog input 2 or T15 Frequency Input) 4-point scaling parameters P6.21 to P6.32.
The scaling parameters refer to input level as a percentage as the units can change depending on the type of input. For example, under default
settings of the scaling parameters for T2 analog input 1, 0 V = 0 % and 10 V = 100 %. If
T2 Analog Input 1 Type (P6.01) ≥ 2, then 4 mA = 0 % and 20
mA = 100 %.
To invert this so 4 mA = 100 % and 20 mA = 0 %, the values at the minimum input and maximum input need to be switched as described in Table 7-3.
Table 7-3 Inverting input signals
For information on reducing the range, offsetting, inverting and switching the polarity using the 4-point scaling parameters, see T2 Analog Input
Minimum Input (P6.21).
Figure 7-15 PID controller block diagram
Parameter
Default Settings Setting to Invert
Name T2 Analog Input 1 T4 Analog Input 2 T15 Frequency Input
Minimum Input P6.21
P6.25 P6.29 0 % 0 %
Percentage at Minimum Input P6.22
P6.26 P6.30 0 % 100 %
Maximum Input P6.23
P6.27 P6.31 100 % 100 %
Percentage at Maximum Input P6.24
P6.28 P6.32 100 % 0 %
2
Fixed Reference 1 P5.01
Delay (P5.15) +ve
Input
+
Menu 5 – PID Controller & Threshold Detector
PID Reference
Slew Rate
Limit P5.06
PID Reference
Selector P5.03
0%
Up/Down
An 1 %
An 2 %
Freq %
PID Feed
Forward
Selector 5.05
PID Feedback
Selector P5.04
0%
An 1 %
An 2 %
Freq %
-
+
PID Proportional
Gain P5.07
PID Integral
Gain P5.08
PID Control
Upper Limit
P5.10
PID Control
Lower Limit
P5.09
PID Enable Selector P5.11
(Set to 11 to select
Threshold detector)
PID Hardware Enable
&
PID
Error
+
P1.19
PID
Percentage
+100%
P5.18 = 0, 0%
P5.18 = 1, - 100%
P1.20
PID Status Indicator
Bit Function
0 PID Enabled
1
Threshold
Detector Active
PID Limit applied
Menu 6
I/O
Configuration
Absolute
+
-
Threshold Detector
Level P5.13
Threshold
Detector
Output Invert
P5.16
Hysteresis P5.14
Delay P5.15
Threshold
Detector
Selector P5.12
1
0
Ouput
Delay (P5.15)-ve
Input
Output
1
0
2
3
4
5
0
1
2
3
Threshold Detector
Function Selector P5.17
Digital function
P1.18
P1.15
P1.16
P1.17
P1.15
P1.16
P1.17
P1.21
Input to AND gate
is set to 1 if the
Enable is not
configured
P1.19 should be
selected as one of
the 4 drive
references, see
P2.21– P2.24.
If inverse operation is
required the scaling
parameters in Menu 6
should be used to invert the
reference and/or the
feedback
Fixed Reference 2 P5.02
6
Fixed Reference 1 P5.01
0%
Up/Down
An 1 %
An 2 %
Freq %
1
0
2
3
4
5
P1.18
P1.15
P1.16
P1.17
Fixed Reference 2 P5.02
6
P5.01 PID Fixed Reference Setpoint 1
P5.02 PID Fixed Reference Setpoint 2
Range: -100.00 to 100.00 % Default: 0.00 %
Used where a setpoint for the controller is fixed and does not change, or could be updated via serial comms.