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Pid Control - Mitsubishi Electric FR-CS84-012 Instruction Manual

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• The motor accelerates to the set frequency f0 according to the normal
command (STF or STR).
• When the output frequency reaches f0 and the X37 signal turns ON, the inverter begins traverse operation and accelerates
to f0 + f1. The acceleration time at this time is according to the
frequency reaches f0, traverse operation begins after the output frequency reaches f0.)
• After the inverter accelerates the motor to f0 + f1, this is compensated with f2, and the motor decelerates to f0 - f1. The
deceleration time at this time is according to the
• After the inverter decelerates the motor to f0 - f1, this is compensated with f3, and the motor accelerates again to f0 + f1.
• When the X37 signal turns OFF during traverse operation, the inverter accelerates/decelerates the motor to f0 according
to the normal acceleration/deceleration time set in
traverse operation, the inverter decelerates the motor to a stop according to the normal deceleration time set in
• If the set frequency (f0) and traverse operation parameters (Pr.592 to Pr.597) are changed during traverse operation, this is
applied in operations after the output frequency reaches f0 before the change was made.
• If the output frequency exceeds Pr.1 Maximum frequency or Pr.2 Minimum frequency during traverse operation, the output
frequency is clamped at the maximum/minimum frequency when the set pattern exceeds the maximum/minimum frequency.
• When the traverse function and S-pattern acceleration/deceleration (Pr.29 ≠ "0") are selected, S-pattern acceleration/
deceleration operation occurs only in the range operated at the normal acceleration/deceleration time (Pr.7, Pr.8).
Acceleration/deceleration during traverse operation is performed linearly.
• If stall prevention activates during traverse operation, traverse operation stops and normal operation begins. When stall
prevention operation is completed, the inverter accelerates/decelerates to f0 at the normal acceleration/deceleration time
(Pr.7, Pr.8). After the output frequency reaches f0, the traverse operation begins again.
• If the value of the amplitude inversion compensation amount (Pr.594, Pr.595) is too large, an overvoltage trip or stall
prevention occurs, and pattern operation cannot be performed as set.
• Changing the terminal assignment using Pr.178 to Pr.182 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.3 Base frequency
page 194
Pr.178 to Pr.182 (Input terminal function selection)
Pr.195 (Output terminal function selection)

5.10.2 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.
PID control automatic
switchover frequency
PID action selection
PID proportional band
PID integral time
PID upper limit
5.10 (A) Application parameters
page 142
page 126
Initial value
Setting range
0 to 400 Hz
0, 20, 21
0.1 to 1000%
0.1 to 3600 s
1 s
0 to 100%
Pr.7 Acceleration time
setting. (If the X37 signal turns ON before the output
. If the start command (STF or STR) is turned OFF during
Set the value at which control is automatically switched to PID control.
The PID control automatic switchover function is disabled.
Select how to input the deviation value, measured value and set point,
and forward and reverse action.
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
The proportional control is disabled.
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.
The integral control is disabled.
Set 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 is equivalent to 100%.
No function
at turn ON of the start


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