Automatic Energy-Saving Operation Function - Hitachi L300P-110L Instruction Manual

(4) The adjustment of gain
Please adjust each gain according to the state as the following, when the response on the functional
operation PID is not stable.
Inspite of changing command, the change of feedback signal is slow.
The feedback signal changes instantly but is not stable.
The command and feedback signal doesn't coincide instantly.
The feedback signal oscillates and is not stable.
In spite of raising of P gain, the response is slow.
When P gain is raised, the feedback signal oscillates and is not stable.
(5) The Maximum PID Deviation Level/Output
It is possible to establish the maximum deviation level C044 on PID control. When the PID deviation
amount reaches the set level C044, it is possible to set an intelligent output.
C044 can be set from 0 to 100 and corresponds with the command; from 0 to maximum.
Assign 04 (OD) to intelligent output terminal 11, 12(C021, C022).
(6) Feedback monitor of PID
Feedback signal of PID can be monitored.
The monitor value can be displayed by the product of PID scale A075.
"Monitor display" = "Feedback (%)" x "A075 setting"
(7) PID integral reset
This is the function to clear integral value of PID action.
Assign 24(PIDC) to intelligent input terminal.
It is cleared whenever PIDC is turned ON.
Don't turn absolutely ON PID terminal during PID action, because there is a possibility of overcurrent trip.
Turn ON PIDC terminal after turning OFF PID action.

Automatic energy-saving operation function

This function regulates the inverter output power automatically to a
minimum while operating at constant speed.
This fits for the load of reduced torque characteristic of fans or pumps.
In case of operating by this function, set A085 to "01".
A086 can adjust the automatic operation, response time.
Set item Function code
Operation
A085
mode selection
Set item
Energy saving
response / accuracy
adjustment
Deta
00 Normal operation
Energy-saving
01
operation
Function code Deta
0
A086
100
Chapter 4 Explanation of function
Contents
Response
Slow
Fast
4-31
Raise P gain.
Lower P gain.
Lower I gain.
Raise I gain.
Raise D gain.
Lower D gain.
Relation code
A085:Operation mode
selection
A086: Energy-saving response-
accuracy adjustment
Accuracy
High
Low