Controlli MVH56EA Manual

Valve Actuators
with Emergency Return Device
FORCE POWER
MODEL
[N] SUPPLY
MVH56EA 700 24Vac/dc
MVH56EC 700 24Vac/dc
APPLICATION AND USE
MVH56Ex is a flexible electro-mechanical actuator for the control of
two and three way globe valves in:
• Heating and Cooling systems
• Air handling units
• District Heating plants
• Industrial Temperature Control systems.
MVH56Ex can be controlled either by a proportional (modulating)
signal or by an increase/decrease (floating) signal.
It is easy to mount and connect the actuator. Direct mounting is pos-
sible to any CONTROLLI flanged valve. Linkage kits are available
for CONTROLLI threaded valves as well as for valves of other ma-
nufacturers (contact our technical Dept.). The Actuator has a fine
resolution (500 steps on the full stroke range) for exacting fluid control
and it is able to self-calibrate on a different stroke without the need
of any user action (this function is selectable on the field via DIP swi-
tch). MVH56Ex has intelligent behaviour and alarm functionality in
case of unexpected operation; feedback of alarms to the user is
provided by two LEDs (GREEN and RED) on the control board.
N.B.: Do not use the actuator if not coupled with the valve.

OPERATION

The actuator translates the control signal (modulating or 3 point flo-
ating) from the controller into a valve position. A modern brushless
DC motor in the actuator drive a gear train and a worm gear – screw
jack mechanism convert the motor revolutions into accurate and
repeatable linear movements.

Control Signal

MVH56Ex can be controlled by two main control types.
• 3 point floating ;
• Modulating (or proportional) signal with filed selectable range
(e.g., 0-10Vdc, 2-10Vdc, 0-5/2-6Vdc, 5-10/6-10Vdc e 4-20mA.)
Controlli S.p.A.
16010 Sant'Olcese (GE)
Tel. 010 73 06 1
Fax. 010 73 06 870/871
www.controlli.eu
DESCRIPTION
Modulating/floating with
emergency return device
with retracted joint (valve
stem up)
Modulating/floating with
emergency return device
with extended joint (valve
stem down)
1 Issue
st
MVH56EA/C

Feedback Signal

The actuator utilizes a 2-10V position feedback (look at DIP n. 1 set-
tings).

Calibration

The actuator has both Auto and Manual Stroke Calibration, DIP n.
7. In factory delivery the auto stroke calibration is enabled; manual
calibration is not necessary unless maintenance is required on the
valve or certain alarm functions are desired.
They are provided with a spring device which, in case of power loss,
makes the actuator return to the rest position.

MANUFACTURING CHARACTERISTICS

The actuator consists in a die-cast aluminium housing, which includes
the mounting bracket for connection to valve body.
Reduction gears supported by ball bearings. Movement is transmit-
ted to a rack-and-pinion mechanism connected to the valve stem
through a suitable joint.
Internal electronic card with easily accessible terminals for electrical
connections. Spring return device consisting of a fl at spring placed
outside the main shaft.
End Point Auxiliary Switches (accessory DMVE)
End point switches change over when the valve is fully open or clo-
sed. They are free contacts with 24Vac max voltage on terminals.
End point switches can be utilized to indicate valve stroke end posi-
tions and for relay control of additional plant equipment.
When the actuators are controlled individually or in sequence, it is
possible to use the end switches to toggle when the valve is fully
open or fully closed. The auxiliary switch position according to con-
trol signal (Y) is shown in the next table.
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