Hitachi L200 Manual Do Utilizador

Using Intelligent Input Terminals

Oper

ations

and Monitor

ing

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 A071 (PID Enable) to stop PID execution and return to normal motor 
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 A071=01.

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.

23

PID

PID Disable

ON

Disables PID loop execution

OFF

Allows PID loop execution if A71=01

24

PIDC

PID Clear

ON

Force the value of the integrator to zero

OFF

No change to PID loop execution

C001, C002, C003, C004, 
C005

A071

The use of [PID] and [PIDC] terminals are 
optional. Use A071=01 if you want PID loop 
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).

Example (requires input configuration—see 
page 

):

See I/O specs on page 

.

PID

PIDC

1

2

3

4

5

L

PCS