Mitsubishi Electric FR-F800 Instruction Manual page 401

(A) Application parameters
• There are three methods to adjust the PID display bias/gain.
(a) Method to adjust any point by application of a current (voltage) to the measured value input terminal
(b) Method to adjust any point without application of a current (voltage) to the measured value input terminal
(c) Method to adjust only the display coefficient without adjustment of current (voltage)
(Refer to page 314 for details on (a) to (c), 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 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.
Pr.934  Pr.935 (normal setting)
Reverse action
Forward action
PID output shutoff release level
(Example) Set the following: Pr.934="500", 20% (4 mA is
applied), Pr.935="100", 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
400
PARAMETERS
Reverse action setting to Pr.128 Reverse action
Forward action setting to Pr.128
Pr.577 -1000
Name
Forward action
PID output shutoff release level
Set point
Deviation +40
Measured value
∗ ( ) indicates the deviation value
which the inverter can recognize
Pr. Name
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
500
400
360
100
0
20%
(0%) (25%) (35%)
Deviation -10%
100%
(100%)