Functioning "Automatic Pid - Toshiba MITOS VT6 AIR User Manual

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Table Of Contents

Table of Contents

In automatic functioning, the MITOS VT6 AIR does an automatic regulation of the frequency sent to the inverter so as

to maintain the controlled variable (pressure, speed or flow) to a settable fixed value through the parameter Set point

PID.

The sent frequency will have like limits the values of parameters UL (upper limit) and LL ( lower limit) set up in the

inverter, that's will be always:

frequency unchanged

The regulation uses a control type PID, P, PI, PD, which can be selected through the parameter Type PID. To enable the

automatic regulation, it is necessary that:

Modality = CONTROL

Control type = AUTOMATIC

MITOS VT6 AIR must have the complete control frequency variation (

The Modality setting is possible only from parameters programming menu.

If the parameter Modality is set up on COMANDO, the Control type is possible is possible also from normal functioning

menu, pressing more than 3 seconds button MAN/AUTO. The continuous pressure of MAN/AUTO allows to change

the value from AUTOMATIC to MANUAL and vice versa. Pressing the button MAN/AUTO for less than three

seconds you will only see the functioning selected at the moment.

The setting of reference value (Set point PID) can be varied from menu programming parameters menu and also from

the menu of normal operation.

In this case, if the parameter Store set point is set on YES, the changing of set point is automatically stored and it will

remain even if the card is turned off and on again; on the other hand, if this parameter is set on NO, the set point

changing won't be stored.

The variation of Set point PID from the menu of normal operation is carried out as follows:

through buttons UP and DOWN set up " SET" on the second line of the display

press the MON button (the second line flashes)

through buttons UP and DOWN vary the value

press the MON button (the second line stop to flash and the value comes acquired)

If MITOS VT6 AIR has the march-arrest control (

STOP/RESET the inerter stops.

When the inverter it's in start and the motor is in rotation, in the first line of the display a little symbol appears on the

right and this indicates the direction of rotation.

After the command of start, the operation is manual with fixed set-point frequency, as the value of the inverter UL

parameters and ACC/DEC ramps with the same value of ACC manual/ DEC manual parameters respective.

When one of the two condition are verify:

an equal time to second delay ACC/DEC PID passes

the controlled variable catches up the set-point

control PID of the frequency enters automatically in function and moreover, ACC/DEC ramps comes set up respective

to the ACC automatic/DEC automatic parameters. Below there is a graphical representation of what is said previously

02/10/2015