Pid-Fb; F-Cnv - Hitachi NT2021XA Instruction Manual

Variable name

PID-FB

Process variable (PV), PID
feedback monitoring
- Explanation
This variable can be used to monitor PID feedback data in the inverter. The data monitored with this variable corresponds to the
data monitored by the process variable (PV), PID feedback monitoring function (d004). This variable is read-only.
- Sample program: Program to stop inverter output when PID feedback data falls below the sleep level (to manage sleep status)
(Code area [Code Window])
Label Mnemonic
LOOP if
stop
goto
LABEL1 FW=
LABEL2 goto
(Data area [Data Window])
U(20) = 2000
Variable name

F-CNV

Scaled output frequency
monitoring
- Explanation
This variable can be used to monitor the converted output frequency of the inverter. The data monitored with this variable
corresponds to the data monitored by the scaled output frequency monitoring function (d007). This variable is read-only.
- Sample program : Program to output the motor speed data to a general-purpose analog output
(Code area [Code Window])
Label Mnemonic
UL(00)=
UL(00)=
UL(00)=
YA(0)=
(Parameter)
b086 = 30.0
Range of values
0 to 9990000
parameter1 parameter2 parameter3
PID-FB >= U(20)
LABEL2
1
LOOP
: Set the PID sleep level of 20% in variable "U (20)".
Range of values
0 to 3996000
parameter1 parameter2 parameter3
F-CNV
UL(00) * 10000
UL(00) / 1800
UL(00)
: Assign the motor speed in Hz to frequency conversion factor variable "b086".
Default Unit
0 0.01 %
parameter4 parameter5
then LABEL1
Default Unit
- 0.01
parameter4 parameter5
2-45
Chapter 2 Syntax
Data size Attribute
Unsigned
Readable
2-word data
: Compare the monitored data with the
sleep level.
: Stop inverter output.
Data size Attribute
Unsigned
Readable
2-word data
: Fetch the converted frequency data.
: Output the data to an analog output.