Mitsubishi Electric Freqrol-A100 Instruction Manual page 158

Freqrol-a100 series transistorized inverter for variable torque loads
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(2)
Parameter setting
1) PI control action selection [Pr. 1281
Set reverse or forward action according to the object to be controlled.
Also, set this parameter to exercise PI control in the inverter only.
Example: Reverse action (Pr. I 2 8
=
0, 10, 20) ............. for heating, pressure control, etc.
Forward action (Pr. I 2 8
=
1 , 11, 21) ............. for cooling, etc.
PI Control
I
Value
Inverter o n l y
- 1
Disabled
Enabled
20
Option
FR-EPDIEPH
Enabled
Disabled
Process Value I n p u t
Select either of the
deviation signal and
process value with the
FBS terminal of the FR-
EPDlEPH option.
Deviation signal input
(Terminal No.
1)
Process value input
(Terminal No. 4)
PI Control
A c t i o n
Reverse action
===I
Forward action
I
Reverse action
To exercise PI control
in the inverter only, al-
ways set any of 10, 11,
20 and 21 and connect
terminals RT and SD.
2) PI proportional band [Pr. 1291
When the proportional band is narrow (parameter setting is small), a slight variation in
process value will vary the manipulated value greatly. Hence, as the proportional band
decreases, the response sensitivity
=
gain increases, but stability will reduce, e.g. hunting
will occur.
Gain Kp
=
I/proportional band
3) Integral time [Pr. 1301
This is a period of time required to obtain the same manipulated value as in the proportional
(P) control action by the integral (I) control action only. As the integral time decreases, the
set value is reached earlier, but hunting is more likely to occur.
4) Upper limit, lower limit [Pr. 1311, [Pr. 1321
If the process value goes out of the setting range, an alarm can be output.
Set the upper limit value in Pr. 131 and the lower limit value in Pr. 132.
In this case, 4mA of the process value signal corresponds to 0% and 20mA to 100%.
Note: Use Pr. 40 (output terminal assignment) to set the output terminals of the upper and
lower limits.
5) PI control set value for PU operation [Pr. 1331
Set the set value (%) in Pr. 133. The set value is valid only in the PU operation mode. In this
case, the set frequency in Pr. 902 corresponds to 0% and the set frequency in Pr. 903
corresponds to 100%. In the external operation mode, the set value is the voltage across
inverter terminals 2 and 5.

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