Pid Control - Mitsubishi Electric FR-F820-00077 Instruction Manual

Parameters
5.11.5

PID control

Process control such as flow rate, air volume or pressure are possible on the inverter.
A feedback system can be configured and PID control can be performed using the terminal 2 input sig-
nal or parameter setting value as the set point, and the terminal 4 input signal as the feedback value.
Pr.
127
A612
128
A610
129
A613
130
A614
131
A601
132
A602
133
A611
134
A615
553
A603
554
A604
575
A621
FR-F800
Name
PID control automatic
switchover frequency
PID action selection
PID proportional band
PID integral time
PID upper limit
PID lower limit
PID action set point
PID differential time
PID deviation limit
PID signal operation
selection
Output interruption
detection time
Initial
Setting range Description
value
Set the value at which control is automatically
0 to 590 Hz
switched to PID control.
9999
9999 Without PID control automatic switchover function
0, 10, 11, 20, 21,
50, 51, 60, 61, 70,
71, 80, 81, 90, 91,
100, 101, 1000, Select how to input the deviation value, measured
0
1001, 1010, value and set point, and forward and reverse action.
1011, 2000,
2001, 2010,
2011
If a narrow proportional band is set (small parameter
setting value), the manipulated amount changes
considerably by slight changes in the measured
0.1 to 1000% value. As a result, response improves as the
100%
proportional band becomes narrower, though
stability worsens as shown by the occurrence of
hunting. Gain Kp=1/proportional band
9999 Without proportional band
With deviation step input, this is the time (Ti) used for
obtaining the same manipulated amount as
proportional band (P) by only integral (I) action.
0.1 to 3600 s
Arrival to the set point becomes quicker the shorter
1 s
an integral time is set, though hunting is more likely
to occur.
9999 Without integral control
Sets the upper limit. The FUP signal is output when
the feedback value exceeds this setting. The
0 to 100%
maximum input (20 mA/5 V/10 V) of the measured
9999
value (terminal 4) is equivalent to 100%.
9999 No function
Set the lower limit. The FDN signal is output when
the measured value falls below the setting range. The
0 to 100%
maximum input (20 mA/5 V/10 V) of the measured
9999
value (terminal 4) is equivalent to 100%.
9999 No function
0 to 100% Set the set point during PID control.
9999
9999 Set point set by Pr. 128.
With deviation ramp input, this is the time (Td) used
for obtaining the manipulated amount only by
0.01 to 10 s proportional action (P). Response to changes in
9999
deviation increase greatly as the differential time
increases.
9999 Without differential control
The Y48 signal is output when the absolute value of
0 to 100%
the deviation exceeds the deviation limit value.
9999
9999 No function
The action when the upper or lower limit for a
measured value input is detected or when a limit for
0 0 to 7, 10 to 17 the deviation is detected can be selected. The
operation for PID output suspension function can be
selected.
If the status where the output frequency after PID
calculation is less than the Pr. 576 setting is
0 to 3600 s
continuously the Pr. 575 set time or more, inverter
1 s
running is suspended.
9999 Without output interruption function
(A) Application parameters
5 - 353