Rev. a
03/04
2
DBL157E
ISO 9000
CONTROLLI
Automatic control systems for:
air conditioning/heating/industrial thermal process.
V.T. AND VB.T VALVES-ACTUATOR ASSEMBLY
N4039
Fig. 1
MVT56
MVT57
MVT56/56A/57
Brown
=
24 V~ 50/60 Hz
White
=
Common
Green
=
V Control signal
A Never perform nor change electrical connections when
power supply in on.
ELECTRICAL DIAGRAM
N3032
MVT56A
N4150
RANGE SELECTION
RANGE AND ACTION SELECTION
The actuator is supplied with 0..10 V- signal and direct action.
In case a different setting is required:
•
Remove the rubber plug (see the figure below)
•
Switch on ‘ON’ position the DIP 2..8 corresponding to the
required range.
•
Direct action: Position DIP N.1 on OFF
Screw spindle lowers if signal increases (V.T and VB.T
valves, direct way opened).
•
Reverse action: Position DIP N.1 on ON
Screw spindle raises if signal decreases (V.T and VB.T
valves, direct way closed).
•
Replace the rubber plug in the previous position.
RANGE
DIP NR..
0..10 V
2
6..9 V
3
1..5 V
4
2..10 V
5
4..7 V
6
6..10 V
7
8..11 V
8
MVT57 actuator has 0..10 V- fixed working signal, direct action.
MVT56A actuator has 4..20 mA fixed working signal, direct ac-
tion.
MVT44
Supply the controller-actuator system, after having mounted
the actuator on the valve body and once the electrical
connections are performed and the action ranges selected.
When powered, the actuator reaches one stroke end and
remains in this position for about 2 min. Afterwards, the actuator
will reach the position set by the controller signal
(MVT56,57,56A).
START UP
DIMENSIONS (mm.)
MVT - V.T. VALVES ASSEMBLY OVERALL
DIMENSIONS
For MVT-valve assembly overall dimensions, make reference
to DBL025 data sheet (for V.T valves) and DBL102 (for VB.T
valves).
N4020
The performances stated on this sheet can be modified without any prior notice due to design improvement.
Fig. 2
MANUAL CONTROL
It is possible to start all MVT
models with manual control by
means of a socket head key (3
mm).
It is necessary to power off
the actuator before starting
the manual control.
N3135