Hitachi WJ200-001S Instruction Manual page 239

432
PID ON/OFF and PID Clear
The PID loop function is useful for controlling motor speed to achieve constant flow,
pressure, temperature, etc. in many process applications. The PID Disable function
temporarily suspends PID loop execution via an intelligent input terminal. It overrides
the parameter
frequency output characteristics. The use of PID Disable on an intelligent input
terminal is optional. Of course, any use of the PID loop control requires setting PID
Enable function =.
The PID Clear function forces the PID loop integrator sum = 0. So, when you turn ON
an intelligent input configured as [PIDC], the integrator sum is reset to zero. This is
useful when switching from manual control to PID loop control and the motor is
stopped.
CAUTION: Be careful not to turn PID Clear ON and reset the integrator sum when the
inverter is in Run Mode (output to motor is ON). Otherwise, this could cause the motor
to decelerate rapidly, resulting in a trip.
Option Terminal
Code Symbol

PID

PIDC
Valid for inputs:
Required settings
Notes:
 The use of [PID] and [PIDC] terminals are
=
optional. Use
control enabled all the time.
 Do not enable/disable PID control while the motor
is running (inverter is in Run Mode).
 Do not turn ON the [PIDC] input while the motor is
running (inverter is in Run Mode).
(PID Enable) to stop PID execution and return to normal motor

Function Name State
PID Disable
PID Clear
~

if you want PID loop
ON Disables PID loop execution
OFF Allows PID loop execution
ON Force the value of the integrator to zero
OFF No change in PID loop execution
Example (default input configuration shown):
7 6 5
See I/O specs on chapter
Description
PIDC PID
4 3 2 1 L PLC
4.
P24