Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual page 284

⋅ 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 display bias coefficient
To perform a reverse operation, set the forward operation in Pr. 128 PID action selection. To perform a forward
operation, set the reverse operation in Pr. 128. In this case, the PID output shutoff release level is (1000 - Pr.
577).
Pr. 934 < Pr. 935 (normal setting)
Reverse operation
Forward operation
PID output shutoff release
level
(Example) Set the following: Pr. 934 = "500" and
20% (4mA is applied), Pr. 935 = "100"
and 100% (20mA is applied).
When the set point=400 and the
measured value=360, the deviation is
+40 (>0), but the inverter recognizes the
deviation with -10% (<0). Because of
this, operation
increase
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."
(12) Analog input display unit changing (Pr. 241)
⋅ You can change the analog input display unit (%/V, mA) for analog input bias/gain calibration.
Depending on the terminal input specification set to Pr. 73, Pr. 267, and voltage/current input switch the display
⋅
units of C3(Pr. 902), C4(Pr. 903), C43(Pr. 934), C45(Pr. 935) change as shown below.
Analog Command (Terminal 4)
(according to Pr. 73, Pr. 267, and Voltage/Current
Input Switch)
0 to 5V input
0 to 10V input
4 to 20mA input
♦ Parameters referred to ♦
Pr. 59 Remote function selection
Pr. 73 Analog input selection
Pr. 79 Operation mode selection
Pr. 178 to Pr. 189 (input terminal function selection)
Pr. 190 to Pr. 196 (output terminal function selection)
C2 (Pr. 902) to C7 (Pr. 905) Frequency setting voltage (current) bias/gain
> Pr. 935 PID display gain coefficient
Reverse operation
setting to Pr. 128
Forward operation
setting to Pr. 128
Pr. 577 - 1000
amount does not
in the reverse operation
Pr. 241 = 0 (Initial Value)
0 to 5V →
displayed in 0 to 100%(0.1%).
0 to 10V →
displayed in 0 to 100%(0.1%).
0 to 20mA →
displayed in 0 to 100%(0.1%).
Refer to page 106
Refer to page 185
Refer to page 206
Refer to page 133
Refer to page 140
Special operation and frequency control
Pr. 934 ≥ Pr. 935
Reverse operation
Forward operation
PID output shutoff release
level
500
Set point 400
Deviation +40
Measured value 360
100
0 to 100% →
displayed in 0 to 5V(0.01V).
0 to 100% →
displayed in 0 to 10V(0.01V).
0 to 100% →
displayed in 0 to 20mA(0.01mA).
Refer to page 193
Forward operation
setting to Pr. 128
Reverse operation
setting to Pr. 128
1000 - Pr. 577
0
20% 100%
(0%) (25%)(35%) (100%)
Deviation -10%
* ( ) indicates the deviation value
which the inverter can
recognize
Pr. 241 = 1
4
273