Pid Control - Hitachi L100 Instruction Manual

PID Control

Func.
Code
A71
A72
A73
A74
A75
A76
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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 calculations will read the
analog input for the process variable (you specify the current or voltage input) and calcu-
late the output. A scale factor in A75 lets you multiply the PV by a factor, converting it
into engineering units for the process. Proportional, integral, and derivative gains are all
adjustable. See page 4–27 for more information on PID loop control.
"A" Function
Name
PID Function Enable Enables PID function,
two option codes:
00... PID Disable
01... PID Enable
PID proportional gain Proportional gain has a range
of 0.2 to 5.0
PID integral time Integral time constant has a
constant range of 0.0 to 150 seconds
PID derivative gain Derivative gain has a range of
0.0 to 100 seconds
PV scale conversion Process Variable (PV) scale
factor (multiplier), range of
0.01 to 99.99
PV source setting Selects source of Process
Variable (PV), option codes:
00... "OI" terminal (current in)
01... "O" terminal (voltage in)
NOTE: The setting A73 for the integrator is the integrator's time constant Ti, not the
gain. The integrator gain Ki = 1/Ti. When you set A73 = 0, the integrator is disabled.
Run-
time
Description
Edit
3–17
L100 Inverter
Defaults DOP,DRW,DOP+
EU/ Func.
Units Name
US Code
00 — F-43 PID SW
1.0 — F-43 PID P
1.0 sec. F-43 PID I
0.0 sec. F-43 PID D
1.0 — F-43 PID
CONV
00 — F-43 PID INPT