Hitachi NT2021XA, Instruction Manual

Page: 61 / 84

Chapter 2 Syntax
2-45
PID-FB
Variable name Range of values Default Unit Data size Attribute
Process variable (PV), PID
feedback monitoring
0 to 9990000 0 0.01 %
Unsigned
2-word data
Readable
- 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 parameter1 parameter2 parameter3 parameter4 parameter5
㩷
㩷
㩷 䋺
㩷 㩷 㩷 㩷 㩷 㩷
LOOP if PID-FB >= U(20) then LABEL1
: Compare the monitored data with the
sleep level.
㩷
stop
㩷 㩷 㩷 㩷 㩷
: Stop inverter output.
㩷
goto LABEL2
㩷 㩷 㩷 㩷 㩷
LABEL1 FW= 1
㩷 㩷 㩷 㩷
LABEL2 goto LOOP
㩷 㩷 㩷 㩷 㩷
㩷
㩷 䋺
㩷 㩷 㩷 㩷 㩷 㩷
(Data area [Data Window])
U(20) = 2000 : Set the PID sleep level of 20% in variable “U (20)”.
F-CNV
Variable name Range of values Default Unit Data size Attribute
Scaled output frequency
monitoring
0 to 3996000 - 0.01
Unsigned
2-word data
Readable
- 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 parameter1 parameter2 parameter3 parameter4 parameter5
㩷
㩷
㩷 䋺
㩷 㩷 㩷 㩷 㩷 㩷
㩷
UL(00)=
㩷 㩷
F-CNV
㩷 㩷
: Fetch the converted frequency data.
㩷
UL(00)= UL(00) * 10000
㩷 㩷
㩷
UL(00)= UL(00) / 1800
㩷 㩷
㩷
YA(0)=
㩷 㩷
UL(00)
㩷 㩷
: Output the data to an analog output.
㩷 㩷 䋺 㩷 㩷 㩷 㩷 㩷
(Parameter)
b086 = 30.0 : Assign the motor speed in Hz to frequency conversion factor variable “b086”.