1
st
Issue
07/2014
DBL399e
Page 3
ON/OFF connection with external relay
Replacement of the old proportional MVT56/57
Connect together the white and the green cable; then connect
the white cable of the new actuator in place of the white cable of
MVT56/57, the new blue cable in place of the old green cable and
the new red cable in place of the old brown cable..
If you need you can make use of the feedback signal, not available
on the old models of actuator.
Do not make electrical connection or changing operation in case
actuators are powered.
Replacement of 3-point ON/OFF MVT28/44
ATTENTION
! In the 3-point ON/OFF MVT28/44 actuators to be re
-
placed, the common wire is withe, while in the new actuators it is
BROWN (look at the scheme on the previous page).
RANGE SELECTION (ONLY MVT503/503S MODELS)
The actuator is supplied prearranged for 0-10V control signal and
direct action; to modify this setting, follow these instructions:
•
Remove the cap and the connector (look at the following pic
-
ture):
For manual override use allen key of 3 mm.
•
Change the DIP switches as indicated in the following scheme:
DIP 1
ON = INV action / stroke
OFF = DIR action / stroke
DIP 2
ON = 2-10 / 6-10
OFF = 0-10 / 0-5
DIP 3
ON = Range SEQ
OFF = Range NORM
DIP 4
ON = fixed stroke
OFF = auto calibr. stroke
DIP 5
ON = 4-20mA
OFF = voltage range
DIP 6
ON = Learning / stroke
OFF = Running / stroke
The actuator can be coupled with push/pull valves VMB.T, VSB.T
(with MVTx03) and VX.T (with MVTx03S) using auto calibration stroke;
or to valves with spring return as VSX..PB and VSXT..PB or similar (with
MVTx03S) using fixed stroke. Actuators with fixed stroke (DIP 4 ON)
have only reverse action.
Through DIP 4 you can choose (on the basis of the coupled valve) if
the stroke must be fixed or automatically calibrated. In case of fixed
stroke (DIP 4 ON) the learning function (DIP 6) and the setting of di
-
rect/reverse action (DIP 1) change their meaning: DIP 1 and 6 will be
used to choose the fixed stroke value (look at the table).
Automatic stroke range selection
DIP 1
DIP 6
Valves stroke
OFF
OFF
5mm
OFF
ON
5,5mm
ON
OFF
2,5mm
ON
ON
3,5mm
Direct Reverse action
Trough DIP1 is possible to set direct or reverse action. In direct action
without control signal the actuator is fully retracted with feedback
set to 2V. With reverse action the actuator is fully exteded and the
feedback without control signal is 2 V in this position.
Through DIP 2,3 and 5 it is possible to set 5 different input ranges. If
DIP 5 is ON, the input range is set at 4-20mA and DIP 2 and 3 have no
meaning. If DIP 5 is OFF, the possible ranges are: 0-10/2-10 if DIP 3 is
OFF and 0-5/6-10 if DIP 3 is ON.
Automatic stroke calibration (valid only for DIP n. 4 in OFF)
This function helps to calibrate the maximum valve time stroke, so
that the actuator can place the valve correctly following the control
signal. If the actuator is powered on, this action can be repeated
any time DIP 6 goes from OFF to ON and DIP 4 is OFF. During normal
operation, it is possible to choose the position of DIP 6: at each start
up the stroke calibration will be carried out if DIP 6 is ON; it will be
maintained the previous stroke if DIP 6 is OFF.
Initial positioning
It will be carried out every time the actuator will be powered on and
the stroke calibration occurs. This procedure allows the actuator to
start from a defined position and then follow the control signal. That
position depends on the selection of DIP 1 (DIP 4 in OFF).
In case the DIP 4 is ON, the initial position means fully extended.
Retry function
If an unexpected stop during the stroke occurs, this function has the
aim to make it disappear. The actuator will be driven in the opposite
direction and then it will try again to reach the position.
Feedback output
The actuator is equipped with a proper output to transmit the feed
-
back signal relating to the supposed actuator position. This signal
can vary from 2 to 10V.
During the “automatic stroke calibration” and “Initial positioning”
function it is fixed at 2V.
White
Green
Brown
Green/brown
▲ ▼
White/brown
SPDT relay
24V
~ for MVT403/403S
230V~ for MVT203/203S
Plug for range
selection
Remove the
connector
Hole for
manual
control
