Nidec H300 - Analog Reference Profile; PID 1 Feedback Output Scaling; Combined PID Square Root Enable; PID Mode Selector

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166 HVAC Drive H300
Issue Number: 3
Pr 14.058 allows scaling to be applied to the combined feedback signal
from PID controller 1 and PID controller 2 after the square root function
has been applied.
The square root functions in the feedback paths are enabled or disabled
with Pr 14.060, Pr 14.061 and Pr 14.062.
When the square root function is enabled, the following algorithm is
applied to the feedback.
Square root function output = Sign(Feedback) x 100.00% x
v(|Feedback| / 100.00%)
where Sign(Feedback) is 1 if the feedback is positive or -1 is the
feedback is negative.
Single setpoint, single feedback (Pr 14.059 = 0 or 1)
The two PID controllers operate independently. The feedback for PID2 is
always from the PID2 feedback input. PID1 feedback can select one of
two sensors as shown in the table below.
Single setpoint, dual feedback (Pr 14.059 = 2 to 5)
PID1 feedback is from two sensors, which can be configured as shown
in the table below.
Dual setpoint, dual feedback (Pr 14.059 = 6 to 7)
When PID mode 6 or 7 is selected the controller operates in a dual zone
mode. In this mode the reference and feedback quantities from each
PID controller are used to calculate two controller errors. These two
errors are then checked and the zone with the larger or smaller absolute
value of error (depending upon mode selected) is used as the error
signal to the PID1 controller.
8.4.7 Analog reference profile
If analog input 2 is used as a reference, then the following reference
profile can be configured.
For example, if the following is required:
• Output frequency = 20 Hz when analog reference < 25%,
• Output frequency = 60 Hz when analog reference > 75%,
• Output frequency = linear ramp between 20 and 60 Hz when analog
reference is between 25 and 75 %, then the parameters should be
set as follows:
•Pr 1.006 = 60
•Pr 1.007 = 20
•Pr 7.041 = 25
•Pr 7.044 = 75
If Pr 7.041 is greater than or equal to Pr 7.044, analog input 2 (Pr 7.002)
will be forced to 0%, so the output frequency will always be equal to the
value in Pr 1.007.
If Pr 7.041 is negative and Pr 7.044 positive, the minimum reference will
be forced to zero, so the profile will be as shown below.
14.058 PID 1 feedback output scaling
RW Uni US
0.000 to 4.000 0.000
14.060 PID 1 Square root enable
14.061 PID 2 Square root enable
RW Bit US
OFF (0) or On (1) OFF (0)
14.062 Combined PID square root enable
RW Uni US
OFF (0) or On (1) OFF (0)
14.059 PID mode selector
RW Uni US
0 to 7 0
Parameter 14.059 Final PID1 feedback
0 PID1 feedback
1 PID2 feedback
Parameter 14.059 Final PID1 feedback
2 PID1 feedback + PID2 feedback
3 Lowest of PID1 feedback and PID2 feedback
4 Highest of PID1 feedback and PID2 feedback
5 (PID1 feedback + PID2 feedback) / 2
Parameter 14.059 PID1 Error
6 Lowest of |PID1 Error| or |PID2 Error|
7 Highest of |PID1 Error| or |PID2 Error|
Analog Reference
Maximum
frequency
(Pr )
1.006
Frequency
Minimum
frequency
(Pr )
1.007
Minimum reference
(Pr )
7.041
Maximum reference
(Pr )
7.044
NOTE
NOTE
Maximum
frequency
(Pr )
1.006
Frequency
Minimum
frequency
(Pr )
1.007
Minimum reference
(Pr )
7.041
Maximum reference
(Pr )
7.044
NOTE