Hitachi SJ7002 Series Instruction Manual page 106

3–22
"A" Group: Standard Functions
PID Control
Func. Name/
Code Description
A071 PID Enable
A072 PID proportional gain
A073 PID integral time constant
A074 PID derivative time constant
A075 PV scale conversion
Process Variable (PV) scale factor (multiplier)
A076 PV source setting
Selects source of Process
Variable (PV)
A077 Reverse PID Action
Changes response to error
A078 PID output limit
A079 PID feed forward select
When enabled, the built-in PID loop calculates an ideal inverter output value to cause a loop
feedback process variable (PV) to move closer in value to the setpoint (SP). The current
frequency command serves as the SP. The PID loop algorithm will read the analog input for the
process variable (you specify either current or voltage input) and calculate the output.
• A scale factor in A075 lets you multiply the PV by a factor, converting it into engineering
units for the process.
• Proportional, integral, and derivative gains are all adjustable.
• Optional – You can assign an intelligent input terminal the option code 23, PID Disable.
When active, this input disables PID operation. See
on page 3–51.
• See "PID Loop Operation" on page 4–75
Keypad
SRW OPE
00
OFF PID operation OFF
0 1
ON PID operation ON
02
R-ON PID operation ON with inverted output
0.2 to 5.0
0.0 to 999.9, 1000. to 3600. (seconds)
0.0 to 99.99, 100.0 (seconds)
0.01 to 99.99, 100.0 (seconds)
00
OI [OI] terminal (current input)
0 1
O [O] terminal (voltage input)
02
COM Communication input
03
PLS Pulse train frequency input
1 0
MATH CALCULATE function output
00
OFF PID input = SP – PV (normal)
0 1
ON PID input = –(SP – PV) (reverse)
Range is 0.0 to 100.0
00
Disable
no
0 1
O [O] terminal (voltage input)
02
OI [OI] terminal (current input)
03
O2 [O2] terminal (voltage input)
NOTE: The setting A073 for the integrator is the integrator's time constant Ti, not the gain.
The integrator gain Ki = 1/Ti. When you set A073 = 0, the integrator is disabled.
"Intelligent Input Terminal Overview"
for more information.
Range and Settings
Defaults
Run
Mode
FEF2 FUF2 FF2
Edit
FE2 FU2 F2
Lo Hi
(EU) (USA) (Jpn)
✘ ✔
00 00 00
✘ ✔
✘ ✔
✔ ✔
1.0 1.0 1.0
✔ ✔
1.0 1.0 1.0
✔ ✔
0.0 0.0 0.0
✘ ✔
1.00 1.00 1.00
✘ ✔
✘ ✔
00 00 00
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔
00 00 00
✘ ✔
✘ ✔
0.00 0.00 0.00
✘ ✔
00 00 00
✘ ✔
✘ ✔
✘ ✔