Mitsubishi Electric FR-F820-00046 Instruction Manual page 425

Fr-f800 series
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• There are three methods to adjust the PID display bias/gain.
Method to adjust any point by application of a current (voltage) to the measured value input terminal
Method to adjust any point without application of a current (voltage) to the measured value input terminal
Method to adjust only the display coefficient without adjustment of current (voltage)
(Refer to
page 339
for details, and make the necessary adjustments by considering C7 (Pr.905) as C45 (Pr.935) and Pr.126
as C44 (Pr.935).)
NOTE
• Always calibrate the input after changing the voltage/current input specification with Pr.73 and Pr.267, and the voltage/current
input selection switch.
• Take caution when the following condition is satisfied because the inverter recognizes the deviation value as a negative
(positive) value even though a positive (negative) deviation is given: Pr.934 (PID bias coefficient) > Pr.935 (PID gain
coefficient).
To perform a reverse action, set Pr.128 PID action selection to forward action. Alternatively, to perform a forward action,
set Pr.128 to reverse action. In this case, the PID output shutoff release level is (1000 - Pr.577).
Pr.934 < Pr.935 (normal setting)
Reverse action
Forward action
PID output shutoff release level
(Example) Set the following: Pr.934 = "500" or 20% (4 mA is applied), Pr.935 = "100" or 100% (20 mA is applied).
When the set point = 400 and the measured value = 360, the deviation is +40 (>0), but the inverter recognizes the deviation
as -10% (<0). Because of this, operation amount does not increase in the reverse operation setting.
The operation amount increases when the forward operation is set.
To perform PID output shutoff release at deviation of +40 or higher, set Pr.577 = "960".
• The display of the following parameters is changed according to the C42 (Pr.934), C44 (Pr.935), Pr.1136, and Pr1138
settings.
Pr.
131
PID upper limit
132
PID lower limit
133
PID action set point
553
PID deviation limit
577
Output interruption cancel level
761
Pre-charge ending level
763
Pre-charge upper detection level
 Changing the PID display coefficient of the LCD operation panel (FR-
LU08) or the parameter unit (FR-PU07) (Pr.759)
• Use Pr.759 PID unit selection to change the unit of the displayed value on the FR-LU08 or the FR-PU07. For the
coefficient set in C42 (Pr.934) to C44 (Pr.935), the units can be changed as follows.
424
5. PARAMETERS
5.11 (A) Application parameters
Reverse action setting to Pr.128
Forward action setting to Pr.128
Pr.577 - 1000
Set point
Deviation +40
Measured value
* ( ) indicates the deviation value
which the inverter can recognize
Name
Reverse action
Forward action
PID output shutoff release level
500
400
360
100
0
20%
(0%) (25%) (35%)
Deviation -10%
Pr.
1143
Second PID upper limit
1144
Second PID lower limit
755
Second PID action set point
1145
Second PID deviation limit
1149
Second output interruption cancel level
766
Second pre-charge ending level
768
Second pre-charge upper detection level
Pr.934 ≥ Pr.935
Forward action setting to Pr.128
Reverse action setting to Pr.128
1000 - Pr.577
100%
(100%)
Name

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