Hitachi WJ200 Series Instruction Manual page 113

3−32
In standard operation, the inverter uses a reference source selected by parameter A001
for the output frequency, which may be a fixed value (F001), a variable set by the front
panel potentiometer, or value from an analog input (voltage or current). To enable PID
operation, set A071=01. This causes the inverter to calculate the target freq, or setpoint.
A calculated target frequency can have a lot of advantages. It lets the inverter adjust
the motor speed to optimize some other process of interest, potentially saving energy as
well. Refer to the figure below. The motor acts upon the external process. To control that
external process, the inverter must monitor the process variable. This requires wiring a
sensor to either the analog input terminal [O] (voltage) or terminal [OI] (current).
Setpoint
When enabled, the PID loop calculates the ideal output frequency to minimize the loop
error. This means we no longer command the inverter to run at a particular frequency,
but we specify the ideal value for the process variable. That ideal value is called the
setpoint, and is specified in the units of the external process variable. For a pump
application it may be gallons/minute, or it could be air velocity or temperature for an
HVAC unit. Parameter A075 is a scale factor that relates the external process variable
units to motor frequency. The figure below is a more detailed diagram of the function.
Standard setting
Multi-speed
A020
POT meter on
V/I select
[AT]
[L]
[O]
[OI]
Error
PID
+
Calculation
SP
PV
Setpoint
(Target)
F001
Scale factor
Reciprocal
setting
1
A075
A035
to
ext. panel
Process variable (Feedback)
Analog input scaling (OI)
A GND
Voltage
Current
A076
PID V/I input select
Freq.
Inverter Motor
Process Variable (PV)
Frequency
source select
A001
SP
+
A102
A101
A105
A103 A104
External
Process
Sensor
Scale factor
A075
P gain
A072
Frequency
setting
I gain
+
A073
D gain
A074
Scale factor Monitor
A075 d004
F001