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5. PARAMETERS
5.11 (A) Application parameters
5.11.6 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 signal or parameter setting
value as the set point, and the terminal 4 input signal as the feedback value.
Pr. Name Initial value Setting range Description
127
A612
PID control automatic
switchover frequency
9999 0 to 590 Hz Set the value at which control is automatically switched to
PID control.
9999 Without PID control automatic switchover function
128
A610
PID action selection 0 0, 10, 11, 20, 21,
50, 51, 60, 61, 70,
71, 80, 81, 90, 91,
100, 101, 1000,
1001, 1010, 1011,
2000, 2001, 2010,
2011
Select how to input the deviation value, measured value and
set point, and forward and reverse action.
129
A613
PID proportional band 100% 0.1 to 1000% If a narrow proportional band is set (small parameter setting
value), the manipulated amount changes considerably by
slight changes in the measured value. As a result, response
improves as the proportional band becomes narrower,
though stability worsens as shown by the occurrence of
hunting. Gain Kp=1/proportional band
9999 Without proportional band
130
A614
PID integral time 1 s 0.1 to 3600 s 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. Arrival to the set point
becomes quicker the shorter an integral time is set, though
hunting is more likely to occur.
9999 Without integral control
131
A601
PID upper limit 9999 0 to 100% Sets the upper limit. The FUP signal is output when the
feedback value exceeds this setting. The maximum input (20
mA/5 V/10 V) of the measured value (terminal 4) is
equivalent to 100%.
9999 No function
132
A602
PID lower limit 9999 0 to 100% Set the lower limit. The FDN signal is output when the
measured value falls below the setting range. The maximum
input (20 mA/5 V/10 V) of the measured value (terminal 4) is
equivalent to 100%.
9999 No function
133
A611
PID action set point 9999 0 to 100% Set the set point during PID control.
9999 Set point set by Pr.128.
134
A615
PID differential time 9999 0.01 to 10 s With deviation ramp input, this is the time (Td) used for
obtaining the manipulated amount only by proportional
action (P). Response to changes in deviation increase
greatly as the differential time increases.
9999 Without differential control
553
A603
PID deviation limit 9999 0 to 100% The Y48 signal is output when the absolute value of the
deviation exceeds the deviation limit value.
9999 No function
554
A604
PID signal operation
selection
0 0 to 7, 10 to 17 The action when the upper or lower limit for a measured
value input is detected or when a limit for the deviation is
detected can be selected. The operation for PID output
suspension function can be selected.
575
A621
Output interruption
detection time
1 s 0 to 3600 s If the status where the output frequency after PID calculation
is less than the Pr.576 setting is continuously the Pr.575 set
time or more, inverter running is suspended.
9999 Without output interruption function
576
A622
Output interruption
d
etection level
0 Hz 0 to 590 Hz Set the frequency at which output interruption is performed.
577
A623
Output interruption cancel
level
1000% 900 to 1100% Level at which the PID output suspension function is
released.
Set "Pr.577 -1000%".
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