Toshiba MITOS VT6 AIR User Manual

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MITOS VT6 AIR

USER MANUAL

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Summary:

GENERAL DESCRIPTION ............................................................................................................................................. 3

GENERAL FEATURES ................................................................................................................................................... 3

FUNCTIONING PARAMETERS .................................................................................................................................... 4

FUNCTIONING MODE OF THE “MITOS VT6 AIR” ..................................................................................................... 7

FUNCTIONING “JUST DISPLAY” ................................................................................................................................. 7

FUNCTIONING “MANUAL” ........................................................................................................................................... 8

FUNCTIONING “AUTOMATIC PID” ............................................................................................................................. 9

PRESSURE / VELOCITY / FLOW RESET .................................................................................................................. 11

RESET INVERTER ALARM ........................................................................................................................................ 11

SELECTION OF SERIAL COMMUNICATION TTL/RS485 ...................................................................................... 11

CONNECTION FOR PRESSURE MEASURE / REGULATION ................................................................................. 12

CONNECTION FOR FLOW OR VELOCITY MEASURE/REGULATION ................................................................ 14

MECHANICAL DIMENSIONS .................................................................................................................................... 15

APPENDIX ..................................................................................................................................................................... 16

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GENERAL DESCRIPTION

MITOS VT6 AIR is a measure, visualization and control device for pressure, velocity and flow. It has got a temperature
sensor (internal) and a differential pressure sensor with two possible range:

+/-999mmH

2

O +/-1% F.S.

+/-2999mmH

2

O +/-1% F.S.

The precision of the pressure measurement is optimized by the compensation in function of the temperature. It is
equipped with 6 buttons and 1 LCD 16x2 lines display (2 lines and 16 fonts each line). It is also programmable by a
menu.
The control is done by a VF-S11, VF-FS1, VF-AS1 VF-NC3, VF-MB1, VF-S15 or VF-PS1 Toshiba inverter, using a
simple TTL serial connection (VF-S11 inverter) or RS485 (other inverter) and it can be manual or automatic. The
selection of the type of serial connection can be selected by a dip-switch placed on the back of the box.
Manual control allow to command run/stop and/or the inverter frequency. The frequency sent is fixed and is
programmable from the display menu.
Automatic control commands run/stop and also regulate the frequency sent to the inverter in order to keep the pressure,
velocity or flow (selectable) at a fixed level, programmable from the display menu. Automatic control uses a PID
regulation characterized by proportional, integrative and derivative parameters, changeable from the programming
menu.
MITOS VT6 AIR can also visualize some functioning parameters of the inverter, such as current and power delivered,
input and output voltage, frequency, hours of functioning, historic of the last four alarms.
Available scales for pressure, velocity and flow are:

Pressure: mmH

2

O; mbar; Pascal; Kpascal.
Velocity: second meter
Flow: hundreds of cube meters per hour; cube meters per second; litres per second.

GENERAL FEATURES

MITOS VT6 AIR has got the following features

Case: Material: ABS. IP65 protection degree
Alimentation: The alimentation is directly taken by the inverter through the serial connecting cable.

The current consumption is: 25mA @ 24 VDC

Working temperature: From -5 to +50 °C
Box dimensions: 120 x 65 x 35 mm.
Weight: 350g.
Input: 1 differential pressure gauge with two possible range

+/-999mmH2O +/-1% F.S.
+/-2999mmH2O +/-1% F.S.

User interfaces: Monocromatic graphic display 2x32 types, 6 buttons (START, MAN/AUTO, UP, DOWN,

MON, STOP/RESET)

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FUNCTIONING PARAMETERS

The parameters programming menu is accessible in the normal functioning menu, by pushing MON button for at least 3
seconds. After the 3 seconds, it is necessary to insert a password. With UP and DOWN, you can change the number
referred to the password, between 0 and 999. Once set the correct value, press MON to confirm. Each wrong password
value allows to view just a part of the available parameters, the first eight in the following pattern. In the programming
menu, you can select the parameter with the buttons UP and DOWN. Then, when the parameter is selected, the
parameter will flash pressing the button MON. Value can be changed through buttons UP and DOWN. To store the new
value, you need to press again MON (the parameter stops flashing). To quit the programming menu, just press
MAN/AUTO.
Here follow all the functioning parameters of MITOS VT6 AIR.

PARAMETER

FUNCTION

POSSIBLE VALUES

Hysteresis

If the PID control is enabled, this act only if:

V >

Set point PID + Hysteresis

or

V <

Set point PID - Hysteresis

where V is the value measured by the controlled
variable

min = 0; max (

2

) appendix

Constant PID Kp

PID control proportional constant

0.0 ÷ 300.0

Constant PID Ki

PID control integrative constant

0.0 ÷ 300.0

Constant PID Kd

PID control derivative constant

0.0 ÷ 300.0

ACC manual

Value of the ACC parameter sent to the inverter
when Type command = MANUAL.

0.1 ÷ 320.0 sec.

DEC manual

Value of the DEC parameter sent to the inverter
when Type command = MANUAL.

0.

1 ÷ 320.0 sec.

ACC automatic

Value of the ACC parameter sent to the inverter
when Type command = AUTOMATIC.

0.1 ÷ 320.0 sec.

DEC automatic

Value of the DEC parameter sent to the inverter
when Type command = AUTOMATIC.

0.1 ÷ 320.0 sec.

Mode

MITOS VT6 AIR can be used as a simple
display, but it can also send run and/or frequency
variation commends to the Inverter

-

COMMAND

-

VISUALIZATOR

Rotation sense

Sense of engine rotation

- AHEAD

- BACK

Feedback

Type of variable where the control PID is
performed

- PRESSURE

-

VELOCITY

- FLOW

Pressure unit

Pressure Unit of measurement

-

mmH2O

-

Pa

-

kPa

-

mBar

Flow unit

Flow Unit of measurement

-

m3 / h (value per 100)

-

m3 / s

-

l / s

Velocity unit

Velocity Unit of measurement

m / s

PID Set point

Set the set-point of the variable where the PID
control is performed

min = 0; max (

2

) appendix

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PARAMETER

FUNCTION

POSSIBLE VALUES

PID Type

Type of PID control

- PID proport.-integr.-derivative

-

PI proportional.-integr

ative

-

P proportional

- PD proportional.-derivative

PID ACC/DEC delay

In AUTOMATIC mode, Inverter starts working
through ACC/DEC ramps equal to ACC
MANUAL/DEC MANUAL. When the
controlled variable reaches the set

-point,

ACC/DEC are automatically set to the values
ACC AUTOMATIC / DEC AUTOMATIC.
This configuration remains till the stop of the
Inverter.
If the controlled variable does not reach the set­point within PID ACC/DEC

Delay

seconds from
the start, ACC/DEC are set to the values ACC
AUTOMATIC/DEC AUTOMATIC

0

-999 sec.

Velocity calculation

Type of velocity calculation.
The setting AIR has to be used in case the fluid
present in the pipe is air. Otherwise, you may use
the GENERIC setting. During velocity
calculation with the section AIR, you need to set
also the fluid temperature in °C, through the
parameter

Fluid Temperature.

The calculation of the velocity with GENERIC
setting is base on the following formula::

v = k

P

[m/s]

where k =

Velocity Constant

(settable) and P is

the differential pressure in mmHH

2

O.

GENERIC AIR

Pipe type

Sets the pipe section.

- RECTANGUL.

- CIRCULAR

Pipe diameter

Circular pipe diameter (mm)

0 2000 mm

Pipe side 1

Rectangular pipe’s side 1 size (mm)

0 2000 mm

Pipe side 2

Circular pipe’s side 1 size (mm)

0 2000 mm

Fluid temperature

Temperature of the fluid in the pipe (°C)
0

200 °C

Speed constant

Sets the constant value in the generic formula for

0.01 99.99

Language

Sets the language of the menu

- GERMAN

-

ITALIAN

-

ENGLISH

- SPANISH

Command type

If the

MITOS VT6 AIR is enabled to send

commands to the inverter (

Mode =

COMMAND) and it has the complete control of
the inverter (run

-

stop and frequency variation

(

1

)), the Command type

parameter determines the

way the commands are sent

-

MANUAL

-

AUTOMATIC (PID)

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PARAMETER

FUNCTION

POSSIBLE VALUES

Var. monitor1

Sets the monitor variable shown in the first line
of the normal functioning display menu.

Var. monitor1

will be visualized only in the

following cases:

Mode

= MONITOR

or

1)

Mode = COMMAND

2) the

MITOS VT6 AIR has only the run/stop

command (

1

)

see appendix (

3

)

Var. monitor2

Sets the monitor variable shown in the second
line of the normal functioning display menu.
Var. monitor2 will always be visualized and can
be changed pushing UP and DOWN buttons
while keeping F2 key pushed. But

in this case the

selection will be kept only until the device is on

see appendix (

3

)

Set point manual

Sets the value of the frequency sent to the
inverter in MANUAL functioning. This value
can be modified from the normal functioning
menu

0.0

500.0 Hz

Store set point

It allows to store automatically or not the set
point variation chosen with the UP and DOWN
keys.
Selecting YES, the set point variation (of the
frequency or of the variable regulated in the PID
control) from the normal functioning menu, is
automatically stored.
Selecting NO, the set point variation is not
automatically stored and when you turn on the
device again the value reloaded is the one saved
using the parameters programming menu.

-

YES

-

NO