Toshiba MITOS VT6 AIR, User Manual

Page: 9 / 17

02/10/2015 9 / 17 Manual_MITOS_VT6_AIR_ver3p3_eng
FUNCTIONING “ AUTOMATIC PID ”
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:
UL frequency unchanged LL
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 (
1
)
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:
1. through buttons UP and DOW N set up “ SET” on the second line of the display
2. press the MON button (the second line flashes)
3. through buttons UP and DOWN vary the value
4. press the MON button (the second line stop to flash and the value comes acquired)
If MITOS VT6 AIR has the march-arrest control (
1
), pressing the button START, the inverter start, pressing the button
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